Distal Radius

Modern Study Review (AI-Generated)

High-Yield Summary

Distal radius fractures are among the most common upper extremity injuries, with significant implications for wrist function and patient quality of life. Accurate classification and timely management are critical to restoring anatomy, preserving wrist motion, and preventing long-term complications such as post-traumatic arthritis. Modern treatment emphasizes individualized care based on fracture pattern, patient factors, and functional demands.

Key Diagnostic Findings

Anatomy

• The distal radius articulates with the carpus (radiocarpal joint) and the distal ulna (distal radioulnar joint, DRUJ).
• Important landmarks include the radial styloid, ulnar styloid, and the sigmoid notch.
• The integrity of the DRUJ and radiocarpal joint is crucial for wrist stability and rotation.

Clinical Presentation

• Patients typically present with wrist pain, swelling, deformity, and limited range of motion after a fall on an outstretched hand (Colles) or direct trauma (Smith, Barton).
• Neurovascular exam is essential to rule out median nerve injury or compartment syndrome.

Imaging

• Standard wrist radiographs: PA, lateral, and oblique views.
• CT scan may be indicated for complex intra-articular fractures or preoperative planning.
• Key radiographic parameters: radial height, radial inclination, volar tilt, and ulnar variance.

Classification Systems

Frykman Classification (Modern Context):

Current Gold Standard Treatment

Non-operative

• Indicated for stable, minimally displaced extra-articular fractures without DRUJ instability.
• Immobilization with a short arm cast or splint for 4–6 weeks.
• Early mobilization after initial immobilization to prevent stiffness.

Operative

• Indications: unstable fractures, intra-articular displacement >2 mm, loss of radial height or volar tilt, DRUJ instability, open fractures, or failure of non-operative management.
• Techniques include volar locking plate fixation (most common), external fixation, percutaneous pinning, or fragment-specific fixation.
• Volar plating has become the gold standard due to biomechanical stability and early mobilization potential.

Modern Complications & Outcomes

Complications

• Malunion leading to altered wrist mechanics and decreased function.
• Post-traumatic arthritis, especially with intra-articular involvement.
• Median nerve neuropathy or complex regional pain syndrome (CRPS).
• Tendon irritation or rupture, particularly extensor pollicis longus with dorsal plating.
• DRUJ instability or chronic pain.

Outcomes

• Early anatomic reduction and stable fixation correlate with improved functional outcomes.
• Patient factors (age, bone quality, comorbidities) influence healing and rehabilitation.
• Most patients regain near-normal function with appropriate treatment; however, some may experience persistent stiffness or pain.

Classic Clinical Notes

Distal Radius

• Colles, Smiths, Bartons (volar/dorsal), Chauffeur’s fractures
• Frykman, 1967
• Increase number indicates more complex fracture
• Types 1,3,5,7 have intact ulnar styloid
• Types 2,4,6,8 have fractured ulnar styloid

Types

• I & II: extra-articular
• III & IV: involve radiocarpal joint
• V & VI: involve distal radioulnar joint (DRUJ)
• VII & VIII: involve both radiocarpal and radioulnar joints

Last Updated on January 25, 2026 by orthonet