Category: Hand and Upper Extremity Review

Hand and upper extremity orthopedic exam prep review questions and answers …

A Comprehensive Guide to Radial Nerve Palsy: Tendon Transfers vs. Nerve Repair

High-Yield Summary

Radial nerve palsy results in wrist, fingerand thumb extension loss, critically impairing hand function; timely diagnosis and intervention dictate outcomes.
Nerve repair is preferred within 6 months of injury when direct repair or grafting is feasible; delayed presentations often require tendon transfers.
Tendon transfers restore function reliably in chronic palsy or failed nerve repair, with selection tailored to patient-specific deficits and donor tendon availability.
Surgical decision-making hinges on injury timing, nerve continuityand patient factors; understanding biomechanics of transfers is essential for optimal restoration.
Mastery of both nerve repair and tendon transfer techniques, including intraoperative nerve assessment and tensioning principles, is crucial for surgical excellence.

Clinical Fundamentals

Anatomy

The radial nerve originates from the posterior cord of the brachial plexus (C5-T1), coursing posterior to the humerus in the spiral groove. It innervates the triceps brachii, anconeus, brachioradialis, extensor carpi radialis longus (ECRL)and all wrist and finger extensors via its posterior interosseous branch. Sensory branches supply the dorsal radial hand and forearm.

Biomechanics

Radial nerve palsy leads to loss of wrist extension, finger metacarpophalangeal (MCP) extensionand thumb extension/abduction, resulting in a “wrist drop” deformity. Wrist extension is critical for optimal finger flexor function via the tenodesis effect; thus, restoring wrist extension is paramount in reconstructive strategies.

Epidemiology

Radial nerve injury occurs in 1-3% of humeral shaft fractures, with higher incidence in high-energy trauma and open fractures. Iatrogenic injury during humeral surgery is a recognized cause. Spontaneous recovery rates vary, with Sunderland grade and injury mechanism influencing prognosis.

Classification & Diagnosis

Classification System	Description	Impact on Management
Sunderland Classification	Grades I-V based on nerve fiber and sheath disruption	Guides prognosis and repair timing; Grades IV-V often require surgery
Seddon Classification	Neuropraxia, Axonotmesis, Neurotmesis	Neuropraxia managed conservatively; neurotmesis requires repair
Humeral Fracture Classification (AO/OTA)	Fracture pattern and location	Predicts risk of radial nerve injury and guides surgical approach

Diagnostic Pearls

Clinical exam must assess motor function of wrist/finger extensors and sensory distribution.
Electromyography (EMG) and nerve conduction studies are most informative 3-4 weeks post-injury to differentiate neuropraxia from axonotmesis.
Ultrasound and MRI can identify nerve continuity and neuroma formation.
Beware of “double crush” syndrome and proximal lesions mimicking radial nerve palsy.

Decision-Making Algorithm

Criteria	Non-Operative Management	Operative Management
Injury Timing	<6 weeks, intact nerve continuity, neuropraxia or axonotmesis	>6 months without recovery, neurotmesis, nerve transection
Nerve Status	Intact nerve on imaging/EMG, no mechanical entrapment	Nerve discontinuity, neuroma, entrapmentor failed conservative treatment
Patient Factors	Low-demand patient, comorbidities precluding surgery	High-demand patient, motivated for rehabilitation
Surgical Options	Observation, splinting, physical therapy	Primary nerve repair, nerve grafting, tendon transfers

Why Choose Nerve Repair?
Early repair preserves native nerve architecture, enabling potential full recovery. Direct repair or grafting is indicated when nerve ends are identifiable and tension-free coaptation is possible.

Why Choose Tendon Transfers?
In chronic palsy (>6 months) or failed nerve repair, irreversible muscle atrophy necessitates tendon transfers to restore function. Transfers provide immediate functional restoration without waiting for nerve regeneration.

Surgical Mastery & Pearls

Nerve Repair Technique

Expose nerve proximally and distally; identify healthy fascicles.

Debride neuroma or scar tissue to healthy nerve ends.

Perform tension-free end-to-end repair using microsurgical technique with 8-0 or 9-0 nylon sutures under magnification.

If gap >2 cm, use autologous nerve graft (usually sural nerve).

Intraoperative nerve stimulation confirms distal muscle response.

Protect repair site with soft tissue coverage; immobilize elbow at 90° flexion for 3 weeks.

Intraoperative Red Flags:

Excessive tension on repair site risks failure.

Misalignment of fascicles reduces functional recovery.

Inadequate debridement leads to neuroma recurrence.

Tendon Transfer Principles

Select donor tendons with expendable function and adequate strength (e.g., pronator teres, flexor carpi ulnaris, flexor carpi radialis).

Restore wrist extension first (commonly pronator teres to ECRB).

Restore finger extension (flexor carpi ulnaris or flexor carpi radialis to extensor digitorum communis).

Restore thumb extension/abduction (palmaris longus or ring finger flexor digitorum superficialis to extensor pollicis longus).

Ensure appropriate tensioning: transfers should restore full active extension without over-tightening.

Postoperative immobilization in functional position for 4-6 weeks followed by intensive therapy.

Technical Tips:

Confirm donor tendon excursion and strength intraoperatively.

Avoid donor site morbidity by preserving critical functions.

Meticulous soft tissue handling prevents adhesions.

Evidence-Based Synthesis

Landmark studies demonstrate that early nerve repair within 6 months yields superior motor recovery compared to delayed intervention. However, functional outcomes remain variable due to factors such as patient age, injury severityand repair technique. Recent randomized trials comparing nerve repair to tendon transfers highlight that transfers provide more predictable and faster functional restoration in chronic palsy, with fewer secondary procedures.

Meta-analyses reveal no significant difference in ultimate grip strength between nerve repair and tendon transfer groups, but transfers allow earlier return to function. Emerging evidence supports combined staged approaches in select cases, where nerve repair is attempted early, followed by tendon transfer if recovery is incomplete.

Controversy persists regarding the optimal timing for tendon transfer and the role of nerve transfers (e.g., median to radial nerve) as adjuncts. Current consensus favors individualized treatment algorithms based on injury chronicity, nerve integrityand patient goals.

Master Class Pro-Tip

When performing tendon transfers for radial nerve palsy, prioritize restoring wrist extension before finger extension to leverage the tenodesis effect, enhancing grip strength and dexterity. Intraoperatively, use dynamic tensioning with the elbow in varying degrees of flexion and wrist in neutral to fine-tune transfer tension. This nuanced adjustment prevents postoperative stiffness and optimizes functional synergy, distinguishing a master surgeon’s outcome from a competent repair.

October 10, 2026/0 Comments/by OrthoNet AI

Hand and Upper Extremity Review

Current Concepts in Total Elbow Arthroplasty: Indications and Complications

High-Yield Summary

Total elbow arthroplasty (TEA) is primarily indicated for complex distal humerus fractures in elderly patients, inflammatory arthritis with joint destructionand select post-traumatic arthritis cases with severe functional limitation.
Implant selection (linked vs. unlinked) and surgical approach must be tailored to bone quality, soft tissue integrityand patient activity level to optimize longevity and function.
Common complications include aseptic loosening, infection, triceps insufficiencyand periprosthetic fracture; early recognition and management are critical to preserving outcomes.
Postoperative rehabilitation protocols must balance early motion to prevent stiffness with protection of soft tissue repairs to avoid extensor mechanism failure.
Recent evidence challenges traditional contraindications, expanding TEA indications while emphasizing meticulous patient selection and surgical technique to minimize complications.

Clinical Fundamentals

Relevant Anatomy and Biomechanics

The elbow is a complex hinge joint comprising the humeroulnar, humeroradialand proximal radioulnar articulations. Stability arises from osseous congruity, collateral ligamentsand dynamic muscular control. The triceps tendon inserts on the olecranon, critical for extension. The ulnar nerve courses posteriorly, vulnerable during exposure.

Biomechanically, the elbow transmits axial loads and allows flexion-extension and forearm rotation. TEA implants must replicate these motions while accommodating varus-valgus stresses. Linked prostheses provide intrinsic stability, compensating for deficient ligaments, whereas unlinked designs rely on soft tissue integrity.

Epidemiology

TEA is less common than hip or knee arthroplasty, with approximately 3,000 procedures annually in the U.S. Indications have evolved from primarily inflammatory arthritis to include complex fractures and post-traumatic arthritis. The patient population is typically older, low-demand, with comorbidities affecting bone and soft tissue quality.

Classification & Diagnosis

Classification System	Description	Impact on Management	Diagnostic Pearls & Pitfalls
Morrey Classification (TEA Indications)	Categorizes indications into inflammatory arthritis, post-traumatic arthritisand acute fractures	Guides implant choice and surgical approach	Distinguish inflammatory vs. post-traumatic arthritis via imaging and clinical history
Mayo Elbow Performance Score (MEPS)	Functional scoring system assessing pain, motion, stabilityand function	Assesses preoperative severity and postoperative outcomes	Beware of overestimating function in patients with neuropathy or stiffness
Periprosthetic Fracture Classification (Wright and Jupiter)	Classifies fractures around TEA based on location and implant stability	Dictates surgical fixation vs. revision arthroplasty	Radiographs may underestimate implant loosening; CT may be necessary

Diagnostic pearls include thorough preoperative imaging with AP, lateraland oblique views, supplemented by CT for fracture comminution or implant assessment. Ulnar nerve function must be documented preoperatively.

Decision-Making Algorithm

Non-Operative vs. Operative Management

Non-operative management is reserved for low-demand patients with minimal pain and preserved functionor those with prohibitive surgical risk. Indications for TEA include:

Complex distal humerus fractures in elderly osteoporotic patients unsuitable for ORIF.
End-stage inflammatory arthritis with joint destruction and functional impairment.
Post-traumatic arthritis with severe pain and limited range of motion refractory to conservative measures.
Failed prior elbow arthroplasty or salvage of complex nonunion.

Surgical Approach and Implant Selection

The choice between linked and unlinked implants hinges on ligamentous integrity and bone stock:

Linked implants provide inherent stability, preferred in cases with collateral ligament insufficiency or severe bone loss.
Unlinked implants require intact soft tissues and are reserved for younger, higher-demand patients with good bone quality.

Surgical approaches include the triceps-sparing, triceps-reflectingand olecranon osteotomy techniques. Olecranon osteotomy offers excellent exposure but risks nonunion and hardware irritation. Triceps-sparing approaches reduce extensor mechanism complications but may limit visualization.

Surgical Mastery & Pearls

Step-by-Step Conceptual Overview

Patient Positioning and Exposure: Supine or lateral decubitus with arm on arm board. Identify and protect the ulnar nerve early. Choose approach based on exposure needs and soft tissue status.

Joint Preparation: Remove osteophytes and debride synovium. Preserve as much bone stock as possible. For fractures, achieve stable fixation of fragments or proceed with resection if comminution precludes fixation.

Trialing and Implantation: Sequentially size humeral and ulnar components. Confirm alignment and stability through full range of motion. Linked implants require precise assembly to avoid mechanical failure.

Triceps Management: Repair or reattach triceps meticulously to prevent postoperative extension lag. Consider augmentation with grafts in compromised tissue.

Closure and Postoperative Protocol: Layered closure with attention to soft tissue tension. Immobilize briefly, then initiate controlled motion to balance stiffness prevention and repair protection.

Intraoperative Red Flags

Excessive bone loss compromising implant fixation.
Inability to achieve stable trial reduction indicating need for linked prosthesis.
Ulnar nerve tension or subluxation after implant placement.
Triceps insufficiency or poor tissue quality requiring augmentation.

Evidence-Based Synthesis

Landmark studies have established TEA as a reliable option for elderly patients with complex distal humerus fractures, demonstrating superior functional outcomes compared to ORIF in osteoporotic bone. Recent randomized trials emphasize early mobilization protocols to reduce stiffness without increasing extensor mechanism failure.

Comparative cohort studies reveal higher complication rates with unlinked implants in patients with ligamentous insufficiency, reinforcing the preference for linked designs in these scenarios. However, long-term survivorship data remain limited, with aseptic loosening and polyethylene wear as persistent challenges.

Meta-analyses highlight infection as the most common cause of revision, underscoring the importance of perioperative antibiotic protocols and sterile technique. Emerging literature explores antibiotic-coated implants and novel bearing surfaces to mitigate this risk.

Controversy persists regarding TEA in younger, active patients due to concerns about implant longevity and activity restrictions. Ongoing trials aim to refine indications and improve implant designs to expand candidacy safely.

Master Class Pro-Tip

Mastery in TEA demands anticipation of soft tissue challenges-prioritize meticulous ulnar nerve handling and triceps repair to prevent debilitating complications. When bone stock is marginal, do not hesitate to convert to a linked prosthesis intraoperatively; the stability gained outweighs theoretical benefits of unlinked designs. Finally, tailor postoperative rehabilitation to patient-specific tissue quality and fixation security-early motion is essential but must never compromise repair integrity. This nuanced balance defines surgical excellence and durable outcomes in total elbow arthroplasty.

September 27, 2026/0 Comments/by OrthoNet AI

Hand and Upper Extremity Review

Management of Monteggia Fracture-Dislocations in Pediatric and Adult Populations

High-Yield Summary

Monteggia fracture-dislocation involves a proximal ulna fracture with radial head dislocation; prompt recognition and anatomic reduction are critical to restore forearm stability and function.
Pediatric Monteggia injuries often allow for closed reduction and casting, whereas adults typically require open reduction and internal fixation (ORIF) due to fracture complexity and soft tissue interposition.
The Bado classification guides management by categorizing injury patterns based on radial head dislocation direction and ulnar fracture morphology.
Failure to restore ulnar length and alignment is the primary cause of persistent radial head dislocation and poor outcomes.
Surgical approach and implant choice depend on patient age, fracture patternand soft tissue status; stable fixation of the ulna precedes radial head reduction.

Clinical Fundamentals

Anatomy: The proximal forearm complex includes the proximal ulna, radial head, annular ligamentand interosseous membrane. The ulna acts as a stable strut maintaining radial head alignment within the radiocapitellar joint. The annular ligament stabilizes the radial head during forearm rotation.

Biomechanics: Forearm stability depends on the congruency of the proximal radioulnar joint and the integrity of the ulna. Disruption of the ulna’s length or alignment alters radial head position, impairing pronation-supination and elbow stability.

Epidemiology: Monteggia fractures are rare, representing less than 5% of forearm fractures. Pediatric cases predominate, often resulting from falls on an outstretched hand with forearm pronation. Adult injuries typically result from high-energy trauma and are more complex.

Classification & Diagnosis

Classification System	Description	Clinical Relevance
Bado Classification	Type I: Anterior radial head dislocation with anterior angulated ulnar fracture. Type II: Posterior/posterolateral radial head dislocation with posterior ulnar angulation. Type III: Lateral radial head dislocation with metaphyseal ulnar fracture. Type IV: Anterior radial head dislocation with fractures of both radius and ulna.	Directs surgical approach and fixation strategy. Type I most common in children; Type II more frequent in adults.
Jupiter Subclassification (Type II)	Further divides Type II into IIA (olecranon), IIB (diaphyseal), IIC (distal ulna), IID (comminuted).	Guides fixation technique and prognosis in adults.

Diagnostic Pearls:

Always obtain true AP and lateral radiographs of the elbow and forearm to assess radial head alignment and ulnar fracture.

Radial head dislocation may be subtle; compare with contralateral side if uncertain.

Beware of missed Monteggia injuries in pediatric patients presenting with isolated ulna fractures-radial head dislocation can be overlooked.

CT imaging is valuable in adults with complex fracture patterns or when radial head reduction is uncertain.

Decision-Making Algorithm

Management Criteria	Non-Operative	Operative
Patient Age	Pediatric (typically <12 years) with stable, reducible injuries	Adults or older children with unstable or irreducible injuries
Fracture Pattern	Isolated ulnar plastic deformation or greenstick fractures with reducible radial head	Complete ulnar fractures with displacement, comminutionor associated radial head fractures
Radial Head Status	Dislocation reducible and stable after ulnar reduction	Irreducible dislocation, radial head fractureor soft tissue interposition
Soft Tissue Condition	Intact annular ligament or minimal disruption	Annular ligament rupture or interposition requiring repair
Reduction Stability	Stable reduction maintained in cast	Unstable reduction necessitating ORIF and possible ligament reconstruction

Rationale:
In children, the plasticity of bone and ligamentous structures allows for closed reduction and casting with close monitoring. In adults, the complexity and instability mandate ORIF to restore anatomy and prevent chronic radial head dislocation, which leads to poor functional outcomes.

Surgical Mastery & Pearls

Step 1: Patient Positioning and Approach
Position supine with the arm on a radiolucent hand table. Use a posterior or lateral approach to the ulna depending on fracture location. Preserve soft tissue attachments to maintain blood supply.

Step 2: Ulnar Fracture Reduction and Fixation
Achieve anatomic reduction restoring length, alignmentand rotation. Use pre-contoured locking plates in adults for stable fixation. In children, flexible intramedullary nails or percutaneous pins may suffice.

Intraoperative Red Flag: Failure to restore ulnar length or residual angulation will prevent radial head reduction.

Step 3: Radial Head Assessment and Reduction
After ulnar fixation, assess radial head position. If dislocated, attempt gentle closed reduction. If irreducible, explore for soft tissue interposition, especially annular ligament or capsule.

Step 4: Annular Ligament Management
Repair or reconstruct the annular ligament if disrupted to maintain radial head stability. Use local tissue or tendon grafts as needed.

Step 5: Confirm Stability and Range of Motion
Test forearm pronation-supination and elbow flexion-extension under fluoroscopy. Confirm stable concentric reduction of the radial head.

Technical Tips:

Avoid excessive soft tissue stripping to preserve blood supply.

Use fluoroscopy judiciously to confirm alignment in multiple planes.

In chronic or missed injuries, consider ulnar osteotomy to restore length and alignment.

Evidence-Based Synthesis

Recent literature emphasizes the primacy of restoring ulnar anatomy to achieve radial head reduction and functional recovery. Multiple cohort studies confirm that inadequate ulnar fixation is the leading cause of treatment failure. Pediatric series demonstrate excellent outcomes with closed reduction and casting when performed early, but delayed diagnosis correlates with poorer prognosis.

In adults, retrospective analyses support ORIF with locking plates for stable fixation, reducing nonunion and malunion rates. The role of annular ligament repair remains debated; some studies show improved stability, while others report satisfactory outcomes without formal reconstruction.

Randomized controlled trials are lacking due to injury rarity, but systematic reviews advocate early surgical intervention in adults and close monitoring in children. Emerging evidence suggests that minimally invasive techniques and early mobilization may improve functional outcomes, though high-level data are pending.

Areas of ongoing debate include the optimal timing of surgery in chronic injuries and the indications for radial head excision or replacement in complex fracture-dislocations.

Master Class Pro-Tip

Mastery in Monteggia fracture-dislocation management hinges on the principle: “Restore the ulnaand the radius will follow.” Prioritize anatomic ulnar reduction with stable fixation before addressing the radial head. Intraoperatively, if radial head reduction remains elusive despite perfect ulnar alignment, suspect soft tissue interposition-meticulously explore and repair the annular ligament. Avoid premature radial head excision; preserving native anatomy yields superior long-term function. Finally, anticipate and prevent complications by ensuring stable fixation and initiating early controlled motion to minimize stiffness and heterotopic ossification.

September 14, 2026/0 Comments/by OrthoNet AI

Hand and Upper Extremity Review

Understanding the Frykman and Fernandez Classifications of Distal Radius Fractures

High-Yield Summary

The Frykman and Fernandez classifications stratify distal radius fractures based on fracture pattern and involvement of the radiocarpal and distal radioulnar joints, guiding surgical decision-making.
Frykman classification emphasizes articular involvement and ulnar styloid fractures, useful for predicting instability and post-traumatic arthritis risk.
Fernandez classification categorizes fractures by mechanism of injury, directly informing the choice of surgical approach and fixation strategy.
Accurate classification requires high-quality AP and lateral radiographs, with CT reserved for complex intra-articular fractures.
Surgical management hinges on restoring articular congruity, radial lengthand alignment to prevent long-term functional impairment.

Clinical Fundamentals

Relevant Anatomy

The distal radius articulates with the scaphoid and lunate, forming the radiocarpal jointand with the distal ulna at the distal radioulnar joint (DRUJ). The volar and dorsal cortical rims provide critical support for carpal stability. The triangular fibrocartilage complex (TFCC) stabilizes the DRUJand its integrity influences fracture management.

Biomechanics

Load transmission through the wrist is primarily via the radius (80%), with the ulna bearing the remainder. Fracture displacement patterns reflect the mechanism of injury and influence carpal alignment and DRUJ stability. Volar tilt, radial inclinationand radial length are key parameters affecting wrist biomechanics and function.

Epidemiology

Distal radius fractures are among the most common fractures encountered, with bimodal distribution: young adults sustain high-energy injuries, while elderly patients typically present with low-energy osteoporotic fractures. The fracture pattern correlates with patient age, bone qualityand injury mechanism.

Classification & Diagnosis

Classification	Basis	Categories	Clinical Relevance	Diagnostic Pearls
Frykman	Articular involvement and ulnar styloid fracture	I: Extra-articular II: Extra-articular + ulnar styloid III: Radiocarpal joint IV: Radiocarpal + ulnar styloid V: Distal radioulnar joint (DRUJ) VI: DRUJ + ulnar styloid VII: Radiocarpal + DRUJ VIII: Radiocarpal + DRUJ + ulnar styloid	Predicts instability and risk of arthritis; guides need for anatomical reduction	Ensure true PA and lateral views; assess ulnar styloid on dedicated views; beware of occult DRUJ disruption
Fernandez	Mechanism of injury and fracture pattern	I: Bending (extra-articular) II: Shearing (radiocarpal joint) III: Compression (intra-articular comminution) IV: Avulsion (ligamentous injury with fracture) V: Combined/multidirectional	Directs surgical approach and fixation method based on injury mechanism	Correlate clinical history with radiographic pattern; use CT for complex intra-articular fractures to delineate comminution

Diagnostic Pearls:

Ulnar styloid fractures may indicate TFCC injury and DRUJ instability.

Subtle intra-articular step-offs require CT for accurate assessment.

Misinterpretation of volar tilt and radial inclination can lead to underestimation of displacement.

Decision-Making Algorithm

Non-Operative Management Criteria

Extra-articular fractures with minimal displacement (<2 mm step-off, <10° dorsal tilt, radial shortening <3 mm).
Stable fracture patterns without DRUJ instability or significant comminution.
Low-demand patients or those with significant comorbidities precluding surgery.

Operative Management Criteria

Intra-articular fractures with >2 mm step-off or gap.
Radial shortening >3 mm or dorsal tilt >10°.
DRUJ instability or associated TFCC injury.
Open fractures or those with neurovascular compromise.
High-energy mechanisms causing comminution or displacement.

Surgical Approach and Implant Selection

Fernandez Type	Surgical Approach	Fixation Strategy	Rationale
I (Bending)	Volar or dorsal based on displacement	Volar locking plate or dorsal plate	Restore alignment, prevent collapse
II (Shearing)	Volar approach preferred	Volar locking plate with fragment-specific fixation	Direct visualization of radiocarpal joint
III (Compression)	Volar approach with possible dorsal supplemental	Volar locking plate ± dorsal buttress	Address comminution and maintain articular congruity
IV (Avulsion)	Ligament repair ± fragment fixation	Suture anchors or small fragment fixation	Restore ligamentous stability
V (Combined)	Combined volar and dorsal approaches	Dual plating or external fixation	Manage complex multidirectional instability

Surgical Mastery & Pearls

Step-by-Step Conceptual Overview

Preoperative Planning: Review imaging thoroughly; identify fracture type, articular involvementand DRUJ status. Plan approach and implants accordingly.

Patient Positioning: Supine with arm on radiolucent hand table; ensure fluoroscopic access.

Approach Selection:

Volar Henry approach for most fractures, especially volar displaced or intra-articular.
Dorsal approach reserved for dorsal comminution or fragment-specific fixation.

Fracture Reduction:

Achieve anatomical reduction of articular surface first using direct visualization or fluoroscopy.
Restore radial length and inclination using ligamentotaxis and provisional K-wire fixation.

Fixation:

Apply volar locking plate ensuring subchondral support without joint penetration.
Supplement with dorsal plating or fragment-specific fixation if needed.

DRUJ Assessment:

Intraoperative evaluation of DRUJ stability after fixation; address TFCC or ulnar styloid fractures if unstable.

Closure and Immobilization:

Layered closure; immobilize in a splint or cast depending on fixation stability.

Intraoperative Red Flags

Failure to restore volar tilt or radial length predicts poor functional outcomes.
Incomplete articular reduction leads to post-traumatic arthritis.
Unrecognized DRUJ instability causes chronic pain and limited rotation.
Over-penetration of screws into the joint space risks cartilage damage.

Evidence-Based Synthesis

Recent randomized controlled trials and meta-analyses emphasize the superiority of volar locking plates in restoring anatomy and function in displaced intra-articular distal radius fractures, especially those classified as Fernandez types II and III. However, controversy persists regarding the management of ulnar styloid fractures: while some studies suggest fixation improves DRUJ stability, others find no functional difference, highlighting the need for individualized assessment.

The Frykman classification, though less detailed biomechanically, remains valuable for predicting arthritis risk, influencing the threshold for operative intervention. Fernandez classification’s mechanism-based approach aligns better with surgical planning, supported by biomechanical studies demonstrating distinct failure patterns requiring tailored fixation.

Emerging evidence advocates for early mobilization post-fixation to optimize functional recovery, balanced against fracture stability. CT imaging has become standard in complex intra-articular fractures to guide precise reduction, a practice supported by improved outcomes in recent cohort studies.

Master Class Pro-Tip

Mastery in distal radius fracture management lies in integrating classification with dynamic intraoperative assessment: do not rely solely on preoperative imaging. Continuously reassess articular congruity and DRUJ stability after provisional fixation. Employ fragment-specific fixation principles, combining volar and dorsal approaches when necessary, to restore the intricate anatomy of the distal radius. This nuanced adaptability, beyond rigid adherence to classification, distinguishes the expert surgeon who consistently achieves superior functional outcomes.

September 1, 2026/0 Comments/by OrthoNet AI

Hand and Upper Extremity Review

A Review of Distal Radioulnar Joint (DRUJ) Instability and Reconstruction

High-Yield Summary

The distal radioulnar joint (DRUJ) is critical for forearm rotation and load transmission; instability leads to pain, weaknessand functional impairment.
DRUJ instability results from disruption of the triangular fibrocartilage complex (TFCC), distal radioulnar ligamentsor osseous incongruity.
Diagnosis hinges on clinical exam maneuvers (e.g., piano key test, DRUJ ballottement) combined with imaging-CT with contralateral comparison is gold standard for subtle instability.
Non-operative management is reserved for acute, stable injuries without significant subluxation; surgical reconstruction is indicated for chronic instability or irreparable soft tissue damage.
Surgical techniques vary from arthroscopic TFCC repair to open ligament reconstruction; choice depends on injury chronicity, tissue qualityand presence of DRUJ arthritis.

Clinical Fundamentals

Anatomy

The DRUJ is a synovial pivot joint formed by the ulnar head and the sigmoid notch of the distal radius. Stability depends on both osseous congruity and soft tissue constraints.

Key stabilizers:

Triangular fibrocartilage complex (TFCC): Primary soft tissue stabilizer, composed of the articular disc, dorsal and volar radioulnar ligaments, meniscus homologueand sheath of the extensor carpi ulnaris (ECU).
Distal interosseous membrane: Secondary stabilizer transmitting axial load.
Joint capsule and ECU subsheath contribute dynamic stability.

Biomechanics

The DRUJ allows pronation and supination by rotation of the radius around the fixed ulna. Stability is maintained by tension in the radioulnar ligaments, which vary with forearm position:

Volar ligament tightens in supination.
Dorsal ligament tightens in pronation.

Load transmission through the DRUJ accounts for approximately 20% of axial load across the wrist, increasing with ulnar deviation.

Epidemiology

DRUJ instability commonly occurs in conjunction with distal radius fractures, Galeazzi fracturesor isolated TFCC tears. Chronic instability is more frequent in young, active patients and those with ligamentous laxity or prior trauma.

Classification & Diagnosis

Classification System	Description	Clinical Relevance
Palmer Classification	Classifies TFCC lesions into traumatic (Type 1) and degenerative (Type 2)	Guides surgical repair vs. debridement
Mino Classification	Focuses on DRUJ instability patterns: dorsal, volar, bidirectional	Directs surgical approach and ligament reconstruction
Radiographic Grading	Based on ulnar variance and subluxation on CT or MRI	Determines need for ulnar shortening or joint salvage

Diagnostic Pearls

Piano key test: Pressing the distal ulna volarly and dorsally; excessive mobility or pain indicates instability.
Ballottement test: Dorsal-volar translation of the ulna relative to the radius; >5 mm translation suggests instability.
Imaging: Standard wrist radiographs may miss subtle subluxation; CT with contralateral comparison is essential for assessing DRUJ congruity and ulnar variance.
MRI arthrography: Useful for detecting TFCC tears but less reliable for dynamic instability.

Common Pitfalls

Overreliance on static imaging without dynamic clinical assessment.
Failure to compare with contralateral wrist on imaging.
Misdiagnosing chronic instability as simple wrist pain or tendinopathy.

Decision-Making Algorithm

Clinical Scenario	Management	Rationale
Acute DRUJ instability without subluxation or TFCC tear	Non-operative: immobilization in supination 4-6 weeks	Allows ligament healing; avoids surgery in stable injuries
Acute DRUJ instability with displaced TFCC tear or DRUJ subluxation	Arthroscopic or open TFCC repair	Restores ligament tension and joint stability
Chronic DRUJ instability with ligament insufficiency but preserved cartilage	Open ligament reconstruction (e.g., Adams-Berger technique)	Reconstructs stabilizers; prevents progression to arthritis
Chronic DRUJ instability with arthritis or ulnar impaction	Salvage procedures: ulnar head resection (Darrach), Sauvé-Kapandjior prosthetic replacement	Addresses pain and mechanical dysfunction when reconstruction is not feasible

Why specific approaches?

Arthroscopic repair is minimally invasive, preserves anatomyand is preferred in acute tears.
Open reconstruction is necessary when tissue quality is poor or chronic attenuation exists.
Salvage procedures are reserved for end-stage disease or failed reconstructions.

Surgical Mastery & Pearls

Step-by-Step Conceptual Overview of Open Ligament Reconstruction (Adams-Berger Technique)

Exposure: Dorsal approach between the ECU and extensor digiti minimi tendons; protect dorsal sensory branches.
Assessment: Evaluate TFCC remnants, joint cartilageand DRUJ congruity.
Graft Harvest: Use palmaris longus or plantaris tendon autograft; prepare for ligament reconstruction.
Tunnel Creation: Drill tunnels in the distal radius sigmoid notch and ulnar fovea to replicate volar and dorsal radioulnar ligaments.
Graft Passage and Fixation: Pass graft through tunnels, tension in neutral forearm rotationand fix with interference screws or suture anchors.
Closure: Repair capsule and ECU subsheath to restore dynamic stability.

Intraoperative Red Flags

Excessive joint gapping after graft fixation suggests inadequate tensioning or tunnel placement.
Injury to dorsal sensory branches can cause chronic neuropathic pain.
Over-tensioning graft leads to restricted forearm rotation and stiffness.

Technical Tips

Use fluoroscopy to confirm tunnel placement and avoid articular penetration.
Maintain forearm in neutral rotation during graft fixation to balance ligament tension.
Repair ECU subsheath meticulously to restore dynamic stabilizer function.

Evidence-Based Synthesis

Recent literature emphasizes the importance of early recognition and tailored surgical intervention for DRUJ instability. High-level studies comparing arthroscopic repair versus open reconstruction demonstrate superior outcomes with arthroscopy in acute TFCC tears but highlight the necessity of open techniques in chronic cases with ligament attenuation.

Biomechanical studies confirm that anatomical reconstruction of both volar and dorsal radioulnar ligaments restores near-normal joint kinematics, reducing the risk of recurrent instability and arthritis.

Controversy remains regarding the optimal management of chronic instability with mild arthritis; some advocate for ligament reconstruction combined with ulnar shortening osteotomy, while others prefer salvage procedures. Long-term comparative data are lacking, underscoring the need for individualized treatment plans.

Emerging evidence supports the use of dynamic ultrasound and 4D CT for improved diagnostic accuracy, though these modalities are not yet standard.

Master Class Pro-Tip

When performing DRUJ ligament reconstruction, prioritize anatomical tunnel placement at the ulnar fovea and sigmoid notch to restore native ligament biomechanics. Avoid over-tensioning grafts by intraoperatively assessing forearm rotation and DRUJ stability under direct visualization. Incorporate meticulous repair of the ECU subsheath to re-establish dynamic stability, which is often overlooked but critical for preventing postoperative subluxation and optimizing functional outcomes. This nuanced balance between static and dynamic stabilizers distinguishes a master surgeon from a competent technician.

August 18, 2026/0 Comments/by OrthoNet AI

Hand and Upper Extremity Review

Current Concepts in the Management of Terrible Triad Injuries of the Elbow

High-Yield Summary

Terrible triad injuries combine elbow dislocation, radial head fractureand coronoid process fracture, resulting in inherent instability requiring surgical intervention in most cases.
Early anatomic restoration of the radial head and coronoid process, combined with lateral collateral ligament (LCL) repair, is critical to restore stability and prevent chronic instability or stiffness.
Non-operative management is rarely indicated except for minimally displaced fractures with a stable joint after reduction.
Surgical approach typically involves a lateral (Kocher or Kaplan) exposure with selective medial exposure for coronoid fixation and medial collateral ligament (MCL) repair if instability persists.
Postoperative rehabilitation balances early motion to prevent stiffness with protection of soft tissue repairs to avoid recurrent instability.

Clinical Fundamentals

Relevant Anatomy

The elbow joint’s stability depends on bony congruity and ligamentous support. The radial head acts as a secondary stabilizer against valgus and axial loads. The coronoid process prevents posterior translation of the ulna. The lateral collateral ligament complex (LCL) resists varus and posterolateral rotatory instability. The medial collateral ligament (MCL) provides valgus stability.

Biomechanics

The terrible triad disrupts both static and dynamic stabilizers. Radial head fractures compromise valgus and axial load resistance. Coronoid fractures destabilize the ulnohumeral articulation. LCL disruption leads to posterolateral rotatory instability. Restoration of these elements is essential to re-establish the elbow’s kinematic chain.

Epidemiology

Terrible triad injuries typically result from high-energy trauma with axial load and valgus stress on an extended elbow. They are more common in young, active patients and represent a surgical challenge due to the complexity of injury patterns and risk of complications such as stiffness, instabilityand post-traumatic arthritis.

Classification & Diagnosis

Classification System	Description	Impact on Management
Regan-Morrey (Coronoid Fracture)	Type I: Tip fracture <2 mm; Type II: <50% height; Type III: >50% height	Type II and III usually require fixation to restore stability.
Mason (Radial Head Fracture)	Type I: Non-displaced; Type II: Displaced partial; Type III: Comminuted; Type IV: Associated dislocation	Type II-IV often need fixation or replacement; Type III and IV favor arthroplasty if reconstruction is not feasible.
O’Driscoll (Coronoid Fracture Subtypes)	Anteromedial facet involvement critical for varus stability	Anteromedial facet fractures require fixation to prevent varus posteromedial instability.

Diagnostic Pearls

Obtain true AP and lateral radiographs; CT with 3D reconstructions is essential for fracture characterization and surgical planning.
Assess elbow stability after closed reduction; persistent instability indicates need for surgical intervention.
Beware of missed coronoid fractures on plain films; subtle fractures can be overlooked, leading to chronic instability.
MRI is rarely needed acutely but may assist in evaluating ligamentous injuries if instability persists postoperatively.

Decision-Making Algorithm

Criteria	Non-Operative Management	Operative Management
Fracture Displacement	Minimal displacement (<2 mm coronoid tip, non-displaced radial head)	Displaced fractures, comminutionor instability after reduction
Joint Stability	Stable joint after closed reduction	Persistent instability or subluxation
Patient Factors	Low-demand, medically unfit for surgery	Active patients, young age, high functional demand
Surgical Approach	N/A	Lateral approach for radial head and LCL repair; medial approach for coronoid fixation and MCL repair if needed

Why Specific Approaches and Implants?

Radial head fixation is preferred for reconstructible fractures; arthroplasty is indicated for comminuted fractures not amenable to fixation to restore lateral column support.
Coronoid fixation is essential for restoring anterior buttress; screws or suture anchors are chosen based on fragment size and location.
LCL repair is mandatory to prevent posterolateral rotatory instability; MCL repair is reserved for persistent valgus instability after bony and lateral repairs.
Early motion protocols require stable fixation and soft tissue repair to minimize stiffness without risking instability.

Surgical Mastery & Pearls

Step-by-Step Conceptual Overview

Patient Positioning and Exposure: Supine or lateral decubitus with arm on arm board. Begin with a lateral approach (Kocher interval between anconeus and extensor carpi ulnaris).
Radial Head Management: Assess fracture pattern; attempt anatomic fixation with headless screws or mini-fragment plates. If comminuted, proceed with modular radial head arthroplasty ensuring correct sizing to avoid overstuffing.
Coronoid Fixation: Through lateral or separate medial approach, fix coronoid fragments with screws or suture lasso technique depending on fragment size and location. Anteromedial facet fractures require direct fixation.
LCL Repair: Reattach LCL complex to lateral epicondyle using suture anchors or transosseous sutures. Confirm stability intraoperatively with varus and posterolateral rotatory stress tests.
MCL Repair: Only if valgus instability persists after bony and lateral repairs; typically via medial approach with suture anchors.
Closure and Postoperative Protocol: Close in layers; apply hinged elbow brace allowing controlled early motion.

Intraoperative Red Flags

Overstuffing radial head arthroplasty causing decreased flexion-extension arc and capitellar wear.
Inadequate coronoid fixation leading to persistent instability.
Failure to repair LCL resulting in posterolateral rotatory instability.
Excessive soft tissue stripping increasing risk of stiffness and heterotopic ossification.

Evidence-Based Synthesis

Recent high-impact studies emphasize the importance of restoring all three components of the terrible triad to optimize outcomes. A randomized controlled trial comparing radial head fixation versus arthroplasty demonstrated superior stability and fewer reoperations with arthroplasty in comminuted fractures, shifting the standard toward prosthetic replacement in these cases. Meta-analyses confirm that coronoid fixation reduces recurrent instability and improves functional scores, especially when the anteromedial facet is involved.

Controversy remains regarding the necessity of routine MCL repair; some studies suggest that stable lateral repair and bony fixation suffice in most cases, reserving MCL repair for persistent valgus laxity. Early motion protocols have evolved, with evidence supporting initiation within 1-2 weeks postoperatively to minimize stiffness without compromising repair integrity.

Despite advances, heterotopic ossification and post-traumatic arthritis remain common complications, underscoring the need for meticulous surgical technique and patient-specific rehabilitation.

Master Class Pro-Tip

When performing radial head arthroplasty, intraoperative fluoroscopy combined with direct visualization of the radiocapitellar joint is essential to avoid over-lengthening the radius. Use trial implants to confirm restoration of the lateral column height and elbow congruity before final implantation. Overstuffing is the most common technical error leading to poor outcomes and is often subtle on imaging. Mastery of this nuance differentiates a competent surgeon from a master in terrible triad management.

August 5, 2026/0 Comments/by OrthoNet AI

Hand and Upper Extremity Review

Surgical Techniques for Coronoid Fracture Fixation in Elbow Instability

High-Yield Summary

The coronoid process is critical for anterior elbow stability; fractures compromise varus and posteromedial rotatory stability, often necessitating fixation in unstable elbows.
Regan-Morrey and O’Driscoll classifications guide fixation strategy by fracture size and location, directly influencing surgical approach and implant choice.
Small tip fractures (<10% of coronoid height) may be managed non-operatively if the elbow is stable; larger or anteromedial facet fractures require surgical fixation to restore stability.
Surgical approaches include the anteromedial, medialand lateral windows, selected based on fracture pattern and associated ligamentous injury.
Fixation techniques range from suture lasso constructs for small fragments to buttress plating for anteromedial facet fractures; rigid fixation is essential to allow early motion and prevent stiffness.

Clinical Fundamentals

The coronoid process forms the anterior buttress of the ulnohumeral joint, resisting posterior translation and varus stress. It contributes approximately 50% of the elbow’s bony stability, particularly against posteromedial rotatory forces. The anteromedial facet is a key stabilizer against varus posteromedial rotatory instability (PMRI), while the tip resists posterior subluxation. The elbow’s stability is further supported by the medial collateral ligament (MCL) and lateral collateral ligament (LCL) complexes, which often sustain concomitant injury in coronoid fractures.

Epidemiologically, coronoid fractures are uncommon in isolation and frequently occur with elbow dislocations or complex fracture-dislocations such as the “terrible triad” (radial head fracture, coronoid fractureand LCL injury). Failure to recognize and fix these fractures leads to chronic instability, arthritisand poor functional outcomes.

Classification & Diagnosis

Classification System	Description	Surgical Implication
Regan-Morrey	Type I: Tip <2 mm Type II: <50% height Type III: >50% height	Type I often non-operative if stable Type II/III usually require fixation
O’Driscoll	Type 1: Tip fractures Type 2: Anteromedial facet fractures Type 3: Basal fractures	Type 2 requires buttress plating to restore varus stability
Diagnostic Pearls	Use CT with 3D reconstructions for fracture morphology Assess elbow stability under fluoroscopy post-reduction Beware of missed anteromedial facet fractures on plain films	Misclassification risks inadequate fixation and persistent instability

Decision-Making Algorithm

Non-operative management is reserved for isolated, small tip fractures (<10% coronoid height) with a stable elbow after reduction and no ligamentous disruption. Early mobilization is critical to prevent stiffness.

Operative fixation is indicated when:

Fracture involves >50% of coronoid height (Regan-Morrey Type III).
Anteromedial facet fractures (O’Driscoll Type 2) causing varus instability.
Associated ligamentous injuries (LCL or MCL) causing gross instability.
Elbow remains unstable after closed reduction.

Surgical approach selection depends on fracture location and associated injuries:

Anteromedial approach for anteromedial facet fractures to allow buttress plating.
Medial approach for basal fractures and MCL repair.
Lateral approach for tip fractures and concomitant radial head fixation.

Implant choice balances fragment size and bone quality:

Suture lasso or suture anchors for small tip fragments.
Headless compression screws for larger fragments with sufficient bone stock.
Mini fragment buttress plates for anteromedial facet fractures to resist varus forces.

Surgical Mastery & Pearls

Step 1: Exposure
Position the patient supine or lateral decubitus with the arm on a radiolucent arm board. Use the approach tailored to fracture type: anteromedial for facet fractures, medial for basal fractures, lateral for tip fractures. Protect the ulnar nerve during medial exposures.

Step 2: Fracture Reduction
Achieve anatomic reduction under direct visualization. Use temporary K-wire fixation to maintain reduction. Confirm reduction fluoroscopically in multiple planes.

Step 3: Fixation
For small tip fractures, employ a suture lasso technique through the anterior capsule and coronoid tip, tied over a bone bridge or suture anchor. For larger fragments, insert headless compression screws perpendicular to the fracture plane to maximize compression without hardware prominence.

For anteromedial facet fractures, apply a mini fragment buttress plate along the medial ulna to counteract varus forces. Ensure the plate is contoured to the ulna and does not impinge on the joint.

Step 4: Ligament Repair
Address concomitant LCL or MCL injuries with suture anchors or transosseous repair to restore soft tissue stability.

Intraoperative Red Flags

Persistent instability after fixation suggests missed ligamentous injury or inadequate fixation.

Excessive soft tissue stripping risks stiffness and heterotopic ossification.

Hardware prominence can cause mechanical block or cartilage damage.

Technical Tips

Use intraoperative fluoroscopy to confirm screw length and plate position.

Preserve the anterior capsule to maintain elbow stability.

Early controlled motion postoperatively reduces stiffness without compromising fixation.

Evidence-Based Synthesis

Recent literature emphasizes the importance of restoring the anteromedial facet in PMRI to prevent recurrent instability. Biomechanical studies demonstrate that buttress plating of the anteromedial facet restores varus stability more effectively than screw fixation alone. Clinical series report improved outcomes with combined bony and ligamentous repair in terrible triad injuries, reducing rates of recurrent dislocation and arthrosis.

Randomized controlled trials comparing fixation methods are limited; however, consensus favors rigid fixation with early motion protocols. Controversy remains regarding the necessity of fixing small tip fractures in the presence of ligamentous repair alone. Emerging data suggest that selective non-fixation may be safe in highly stable elbows, but this requires careful intraoperative assessment.

The evolving role of arthroscopic-assisted fixation is promising but currently lacks robust comparative data. Future studies are needed to define indications and long-term outcomes.

Master Class Pro-Tip

Mastery in coronoid fracture fixation hinges on recognizing the fracture’s biomechanical role within the elbow’s stability complex. Prioritize anatomic restoration of the anteromedial facet with buttress plating when indicatedand never underestimate the need for meticulous soft tissue repair. Intraoperative dynamic assessment of stability after fixation guides the necessity for additional ligament reconstruction. This tailored, stability-driven approach-not fragment size alone-defines surgical excellence and optimizes functional recovery.

July 23, 2026/0 Comments/by OrthoNet AI

Hand and Upper Extremity Review

Understanding the Mason Classification of Radial Head Fractures

###

### High-Yield Summary

– The Mason classification stratifies radial head fractures by displacement and comminution, directly guiding management from non-operative care to complex reconstruction or arthroplasty.
– Type I fractures are nondisplaced or minimally displaced and typically managed non-operatively with early motion.
– Type II fractures involve displacement >2 mm or mechanical block and often require open reduction and internal fixation (ORIF).
– Type III fractures are comminuted and unstable, frequently necessitating radial head excision with replacement arthroplasty to restore elbow stability.
– Accurate classification depends on high-quality imaging, including true anteroposterior and lateral radiographs, supplemented by CT for complex or comminuted fractures.

### Clinical Fundamentals

#### Relevant Anatomy
The radial head articulates with the capitellum and the radial notch of the ulna, contributing to elbow stability and forearm rotation. The lateral collateral ligament complex attaches near the radial head, making its integrity critical for varus and posterolateral rotatory stability.

#### Biomechanics
The radial head transmits axial load from the wrist to the humerus, bearing up to 60% of the load in valgus stress. Loss of radial head integrity compromises elbow stability, especially in the presence of ligamentous injury or coronoid fractures.

#### Epidemiology
Radial head fractures account for approximately one-third of all elbow fractures, predominantly occurring in adults aged 30-50 years after a fall on an outstretched hand with the elbow partially flexed.

### Classification & Diagnosis

*Type IV is a modification by Johnston, emphasizing associated dislocation.

#### Diagnostic Pearls
– Obtain true AP and lateral elbow radiographs with the forearm in neutral rotation to avoid underestimating displacement.
– CT scans are essential for assessing comminution and fragment size in Type II and III fractures.
– Beware of subtle mechanical blocks indicating intra-articular fragment displacement, which mandates surgical intervention.

### Decision-Making Algorithm

#### Surgical Approach and Implant Choice
– The Kocher interval (between anconeus and extensor carpi ulnaris) provides safe lateral access.
– Headless compression screws are preferred for large fragments in Type II fractures.
– For comminuted fractures, modular radial head arthroplasty restores stability and load transmission better than excision alone.

### Surgical Mastery & Pearls

#### Step-by-Step Conceptual Overview
1. Position the patient supine or lateral decubitus with the arm on an arm board to allow full elbow flexion and extension intraoperatively.
2. Identify and protect the posterior interosseous nerve during lateral exposure.
3. Use the Kocher approach to access the radial head, avoiding excessive soft tissue stripping to preserve blood supply.
4. For Type II fractures, achieve anatomic reduction with provisional K-wires, then secure with headless screws ensuring subchondral support.
5. In Type III fractures, assess the feasibility of fixation; if not reconstructible, proceed with modular arthroplasty sized to restore radial length and avoid overstuffing.
6. Confirm elbow stability through full range of motion after fixation or arthroplasty.
7. Repair lateral collateral ligament complex if injured to prevent posterolateral rotatory instability.

#### Intraoperative Red Flags
– Excessive stripping of soft tissues leading to avascular necrosis risk.
– Overstuffing the radial head prosthesis causing limited motion and capitellar wear.
– Failure to recognize and address associated ligamentous injuries resulting in chronic instability.

### Evidence-Based Synthesis

Recent randomized controlled trials and meta-analyses have refined the management of Mason Type II and III fractures. Evidence supports non-operative treatment for minimally displaced fractures with excellent functional outcomes and low complication rates. For Type II fractures, ORIF improves range of motion and reduces mechanical block compared to conservative care, but fixation failure rates increase with comminution.

In comminuted Type III fractures, radial head arthroplasty has demonstrated superior elbow stability and functional scores compared to excision alone, particularly in the setting of ligamentous injury. However, controversy persists regarding the optimal implant design and long-term outcomes, with some studies reporting polyethylene wear and capitellar erosion.

The literature underscores the importance of restoring radial length and addressing concomitant soft tissue injuries to optimize outcomes. Surgical timing and early mobilization protocols remain areas of ongoing investigation, with emerging data favoring early motion to prevent stiffness without compromising fixation.

### Master Class Pro-Tip

Mastery in managing radial head fractures hinges on appreciating the radial head as a keystone of elbow stability rather than a mere fracture fragment. Prioritize anatomic restoration of the articular surface and radial length while meticulously preserving soft tissue attachments. When arthroplasty is indicated, intraoperative trialing to avoid overlengthening is critical-use fluoroscopy to compare radial height with the contralateral side. Finally, always assess and address lateral collateral ligament integrity intraoperatively; failure to do so is the most common cause of postoperative instability and poor functional outcomes.

July 10, 2026/0 Comments/by OrthoNet AI

Hand and Upper Extremity Review

Management of Acute and Chronic Lateral Epicondylitis

High-Yield Summary

Lateral epicondylitis (LE) is a tendinopathy primarily involving the extensor carpi radialis brevis (ECRB) origin, presenting with lateral elbow pain exacerbated by wrist extension and gripping.
Non-operative management, including activity modification, physical therapyand corticosteroid or biologic injections, remains first-line for both acute and chronic cases.
Surgical intervention is reserved for refractory cases beyond 6 months of optimized conservative care or those with mechanical symptoms; open, arthroscopicand percutaneous techniques each have specific indications.
Precise identification and debridement of pathologic ECRB tissue, preservation of lateral collateral ligament (LCL) complexand restoration of tendon integrity are critical for surgical success.
Recent evidence questions the long-term benefit of corticosteroids and highlights the evolving role of biologics and minimally invasive surgery, emphasizing individualized treatment algorithms.

Clinical Fundamentals

Anatomy:
The lateral epicondyle serves as the common extensor origin, with the ECRB tendon being the primary structure implicated in LE. The ECRB lies deep to the extensor carpi radialis longus (ECRL) and extensor digitorum communis (EDC). The lateral collateral ligament complex, including the radial collateral ligament and the lateral ulnar collateral ligament, is adjacent and must be preserved during surgery.

Biomechanics:
ECRB stabilizes the wrist during extension and resists valgus forces at the elbow. Repetitive microtrauma from wrist extension and forearm supination leads to angiofibroblastic tendinosis rather than inflammatory tendinitis, characterized by collagen disorganization and neovascularization.

Epidemiology:
LE affects 1-3% of the general population, peaking between 35 and 55 years. It is more common in individuals performing repetitive wrist extension or gripping activities, including manual laborers and athletes. Both acute overload and chronic degeneration contribute to symptomatology.

Classification & Diagnosis

Classification System	Description	Clinical Relevance
Nirschl Stages	1-7 scale based on symptom severity and histopathology	Guides prognosis and timing of surgery
Ultrasound Grading	Grades 0-3 based on tendon hypoechogenicity, neovascularityand tears	Assists in diagnosis and monitoring response
MRI Classification	Tendinosis, partial tear, full-thickness tear	Surgical planning, especially for chronic refractory cases

Diagnostic Pearls:

Tenderness localized 1 cm distal to the lateral epicondyle over ECRB origin is pathognomonic.

Pain reproduced by resisted wrist extension with the elbow extended confirms diagnosis.

Differentiate from radial tunnel syndrome by absence of sensory symptoms and pain location.

Beware of concurrent intra-articular pathology or lateral collateral ligament injury in refractory cases.

Decision-Making Algorithm

Management Pathway	Indications	Rationale
Non-Operative	Symptoms < 6 months, no mechanical symptoms, no tendon rupture	Most cases resolve with conservative care; avoids surgical morbidity
Operative	Symptoms > 6 months refractory to non-operative care, partial tendon tear >50%, mechanical symptoms, failed biologics	Surgery removes pathologic tissue, restores tendon functionand addresses structural defects

Surgical Approach Selection:

Open technique preferred for large tears or when direct visualization is necessary.

Arthroscopic approach allows concurrent intra-articular assessment and faster recovery but requires advanced skill.

Percutaneous techniques suitable for tendinosis without significant tearing, with minimal soft tissue disruption.

Surgical Mastery & Pearls

Stepwise Surgical Technique (Open Approach):

Patient positioning supine or lateral decubitus with arm on arm table.

4-5 cm longitudinal incision centered over lateral epicondyle.

Identify and protect the posterior cutaneous nerve of the forearm.

Incise extensor aponeurosis longitudinally to expose ECRB origin.

Debride angiofibroblastic tissue and excise degenerative tendon while preserving healthy fibers.

Avoid injury to lateral collateral ligament complex; confirm stability intraoperatively.

Repair or advance tendon edges with nonabsorbable sutures if necessary.

Close extensor aponeurosis and skin in layers.

Intraoperative Red Flags:

Unexpected instability suggests lateral collateral ligament injury requiring repair.

Extensive tendon loss may necessitate augmentation or reconstruction.

Excessive soft tissue dissection increases risk of postoperative stiffness and hematoma.

Technical Tips:

Use loupe magnification to differentiate pathologic from normal tendon.

Maintain meticulous hemostasis to reduce postoperative swelling.

Early controlled mobilization post-op improves functional outcomes.

Evidence-Based Synthesis

Landmark randomized controlled trials have established that corticosteroid injections provide short-term pain relief but are associated with higher recurrence rates and poorer long-term outcomes compared to physical therapy or placebo. Recent meta-analyses favor eccentric strengthening protocols and shockwave therapy as effective non-operative modalities.

Surgical literature comparing open versus arthroscopic release shows comparable pain relief and functional improvement; however, arthroscopy offers faster recovery and the ability to address concomitant intra-articular pathology. Percutaneous techniques remain investigational with limited high-quality evidence.

Emerging studies on platelet-rich plasma (PRP) and autologous blood injections demonstrate mixed results, with some trials showing improved tendon healing and symptom relief, while others report no significant benefit over placebo. This reflects ongoing uncertainty and the need for standardized protocols.

Current consensus supports a stepwise approach prioritizing non-operative care for at least 6 months, reserving surgery for refractory cases with objective tendon pathology. The choice of surgical technique should be individualized based on surgeon expertise, patient factorsand tendon integrity.

Master Class Pro-Tip

Mastery in lateral epicondylitis surgery hinges on the nuanced balance between adequate debridement of pathologic tissue and preservation of the lateral collateral ligament complex. Overzealous excision risks iatrogenic instability, while insufficient removal predisposes to persistent symptoms. Employ intraoperative dynamic assessment of elbow stability after debridementand consider adjunctive biologic augmentation selectively in chronic, recalcitrant cases to optimize tendon healing and functional restoration.

June 26, 2026/0 Comments/by OrthoNet AI

Hand and Upper Extremity Review

Surgical Options for Proximal Interphalangeal (PIP) Joint Arthrodesis and Arthroplasty

High-Yield Summary

Proximal interphalangeal (PIP) joint arthrodesis is the gold standard for end-stage arthritis or severe instability when pain relief and stability outweigh motion preservation.
PIP joint arthroplasty is indicated for patients prioritizing motion, typically with less severe joint destruction and intact soft tissues.
Implant choice and surgical approach depend on patient factors, joint pathology, and surgeon expertise; common implants include silicone spacers, pyrocarbon, and surface replacement prostheses.
Complications differ by procedure: arthrodesis risks nonunion and malalignment; arthroplasty risks implant loosening, subsidence, and stiffness.
Surgical success hinges on precise joint preparation, soft tissue balancing, and implant positioning to optimize function and durability.

Clinical Fundamentals

Anatomy:
The PIP joint is a hinge synovial joint formed by the head of the proximal phalanx and the base of the middle phalanx. Stability is provided by collateral ligaments, volar plate, and extensor mechanism. The joint allows approximately 100-110 degrees of flexion-extension, critical for hand dexterity.

Biomechanics:
Load transmission through the PIP joint is significant during grip and pinch. The joint’s congruent articular surfaces and ligamentous constraints maintain stability while permitting motion. Loss of cartilage or ligament integrity leads to pain, deformity, and functional impairment.

Epidemiology:
PIP joint arthritis commonly results from trauma, inflammatory arthritis (e.g., rheumatoid arthritis), or osteoarthritis. It disproportionately affects dominant hands and middle fingers due to mechanical stress.

Classification & Diagnosis

Classification System	Description	Impact on Management
Eaton-Littler Classification	Grades PIP joint arthritis severity based on radiographic joint space narrowing and osteophyte formation	Guides timing of arthroplasty vs. arthrodesis
Wehbé and Schneider Classification	Categorizes PIP joint fracture-dislocations by fracture pattern and stability	Determines need for surgical fixation or arthrodesis
Larsen Score (for RA)	Radiographic scoring of joint destruction severity	Influences decision for joint replacement vs. fusion

Diagnostic Pearls:

Obtain true lateral and oblique radiographs to assess joint space, subluxation, and osteophytes.

Clinical exam should assess stability, range of motion, and deformity.

MRI or ultrasound may be useful to evaluate soft tissue integrity in inflammatory arthritis.

Common Pitfalls:

Underestimating collateral ligament insufficiency leads to poor arthroplasty outcomes.

Failure to recognize malalignment or subluxation can result in implant failure or nonunion.

Decision-Making Algorithm

Non-Operative Management:
Indicated for mild symptoms, preserved joint space, and minimal deformity. Includes splinting, NSAIDs, corticosteroid injections, and hand therapy.

Operative Management Criteria:

Severe pain refractory to conservative care.

Radiographic evidence of joint destruction or instability.

Functional impairment impacting activities of daily living.

Arthrodesis Indications:

Severe joint destruction with instability or deformity.

High-demand patients requiring stable, pain-free digits.

Failed arthroplasty or infection.

Arthroplasty Indications:

Moderate joint destruction with preserved soft tissue envelope.

Patients prioritizing motion over absolute stability.

Rheumatoid arthritis with less severe deformity.

Surgical Approach and Implant Selection:

Dorsal approach is most common for both arthrodesis and arthroplasty, providing excellent exposure.

Arthrodesis implants include compression screws, plates, and intramedullary devices.

Arthroplasty implants vary: silicone spacers for flexibility, pyrocarbon for durability, and surface replacements for anatomic restoration.

Surgical Mastery & Pearls

Arthrodesis Technique Overview:

Expose joint dorsally, preserving extensor mechanism.

Remove cartilage meticulously to expose subchondral bone.

Achieve precise alignment in slight flexion (20-30 degrees) to optimize function.

Use compression fixation to promote union; confirm stability intraoperatively.

Avoid excessive soft tissue stripping to preserve blood supply.

Arthroplasty Technique Overview:

Dorsal approach with careful extensor tendon elevation.

Resect minimal bone to preserve length and ligament attachments.

Balance collateral ligaments to prevent instability.

Trial implants to confirm range of motion and stability before final implantation.

Meticulous soft tissue repair to prevent extensor lag or joint subluxation.

Intraoperative Red Flags:

Excessive bone resection risking joint instability or implant subsidence.

Inadequate collateral ligament balancing causing postoperative deformity.

Poor implant fit leading to early loosening or stiffness.

Failure to achieve compression in arthrodesis risking nonunion.

Evidence-Based Synthesis

Recent randomized controlled trials and cohort studies emphasize the superiority of arthrodesis for pain relief and durability in severe PIP joint arthritis, with union rates exceeding 90% when compression fixation is used. Arthroplasty offers improved range of motion but carries higher revision rates, particularly with silicone implants prone to fracture and pyrocarbon implants susceptible to loosening.

Comparative studies highlight that patient selection is paramount: younger, active patients with less joint destruction benefit from arthroplasty, while older or high-demand patients achieve better long-term outcomes with arthrodesis. Advances in implant design, such as pyrocarbon surface replacements, show promise but require longer-term data to confirm durability.

Soft tissue balancing and surgical technique remain critical determinants of success, often outweighing implant choice. Emerging evidence suggests that early mobilization protocols after arthroplasty improve functional outcomes without increasing complication rates.

Master Class Pro-Tip

Mastery in PIP joint surgery demands an intimate understanding of the joint’s biomechanical axis and soft tissue constraints. When performing arthrodesis, aim for a reproducible flexion angle tailored to the digit’s functional role-typically 20 degrees for the index and middle fingers, 30 degrees for the ring, and 40 degrees for the small finger. For arthroplasty, prioritize ligamentous balancing over aggressive bone resection; subtle collateral tightening or release can mean the difference between a stable, mobile joint and a painful, unstable one. Finally, intraoperative fluoroscopy is invaluable for confirming implant positioning and alignment before closure, preventing costly revisions.

June 13, 2026/0 Comments/by OrthoNet AI