Forearm Fractures - Complications

Modern Study Review (AI-Generated)

High-Yield Summary

Forearm fractures require precise anatomical restoration to preserve forearm rotation and function. Complications such as malunion, refracture, compartment syndrome, and synostosis significantly impact outcomes and must be promptly recognized and managed. Modern treatment emphasizes early diagnosis, anatomical reduction, and vigilant postoperative monitoring to optimize pain relief and functional recovery.

Key Diagnostic Findings

Anatomy

The radius and ulna function as a unit, allowing pronation and supination via the proximal and distal radioulnar joints (PRUJ and DRUJ).
Preservation of interosseous space and alignment is critical to maintain forearm rotation.

Clinical Presentation

Malunion presents with deformity, loss of rotation, and possible DRUJ instability.
Compartment syndrome manifests as severe pain, tense compartments, and neurovascular compromise.
Synostosis leads to loss of forearm rotation.

Imaging

Bilateral forearm X-rays (AP and lateral) are essential to assess alignment, angulation, and rotation.
CT scans may be used for complex malunions or DRUJ evaluation.
Serial imaging is critical to monitor healing and detect refracture or early synostosis.

Classification Systems

Complication	Description
Malunion	Angular or rotational deformity due to inadequate reduction or delayed treatment
Refracture	Occurs in ~12% of cases, up to 1 year post-injury
Compartment Syndrome	Elevated pressure in forearm compartments requiring urgent decompression
Synostosis	Bony fusion between radius and ulna, limiting rotation; risk factors include severe trauma and surgical insult

Current Gold Standard Treatment

Non-operative

Early malunion with incomplete healing: manual or drill osteoclasis followed by casting to correct deformity.
Close monitoring for compartment syndrome with prompt fasciotomy if indicated.

Operative

Solidly united malunions: corrective open osteotomy with internal fixation, guided by contralateral limb imaging to restore anatomy.
DRUJ instability or pain: salvage procedures such as Darrach procedure for late sequelae.
Compartment syndrome: emergent anterior and posterior fasciotomies, including decompression of carpal tunnel and release of lacertus fibrosis.
Synostosis: delayed excision after bone maturation with interposition of fat and periosteal excision to prevent recurrence.

Modern Complications & Outcomes

Complications

Complication	Key Points
Malunion	Rotational deformities cause the greatest functional impairment; angular deformities are easier to correct.
Refracture	Occurs in 12% of cases; requires careful follow-up for at least 1 year post-injury.
Compartment Syndrome	Requires urgent diagnosis and fasciotomy to prevent permanent neurovascular damage.
Synostosis	Increased risk with repeated surgery, severe comminution, and closed head injury; prevention includes minimal soft tissue disruption and careful surgical technique.

Outcomes

Anatomical restoration correlates strongly with improved pain and function.
Early recognition and treatment of complications reduce long-term disability.
Surgical correction of malunion and synostosis can restore function but may require prolonged rehabilitation.
Compartment syndrome, if untreated, leads to permanent disability.

Classic Clinical Notes

Forearm Fractures – Complications

Malunion

Caused by inadequate follow-up, improper reduction, delayed diagnosis and treatment

Rotational loss is most disabling

If early consolidation but not yet healed – manual osteoclasis and casting
If late consolidation with callus – can try drill osteoclasis and casting
If solidly united – open osteotomy and internal fixation
Get x-rays of other side
Decide exactly what the deformity is – how much angulation, and how much rotation?
Angular malalignment is, in general, easier to correct than rotational
For late DRUJ pain and instability, can do a Darrach

Refracture

12% of cases

Can occur up to one year after

Overgrowth

Not an issue

Compartment Syndrome

Be ready to do anterior and posterior fasciotomies

Anterior fasciotomy must decompress carpal tunnel, deep compartment, and release lacertus fibrosis. Also look for compression of NV structures at proximal edge of pronator teres and FDS

Synostosis

Risk increases with repeated manipulations, severe comminution and displacement, surgical trauma, application of onlay bone grafts (with narrowing of the interosseous space), and closed head injury

Can occur with one and two incision techniques

Do not touch until the bone has matured

Excise and interpose fat; excise periosteum too

Last Updated on January 25, 2026 by orthonet