Post-traumatic Stiffness & Contracture
- The FUNCTIONAL ARC of elbow motion (Morrey) is about 30-130 degrees of flexion (a 100-degree arc) and 50-50 degrees of pronation-supination; loss of motion within this arc - especially terminal extension and the ability to reach the face - is what disables patients.
- Post-traumatic elbow stiffness is classified (Morrey) as EXTRINSIC (capsule/collateral-ligament contracture, HETEROTOPIC OSSIFICATION, skin/muscle - articular surface preserved), INTRINSIC (articular incongruity/malunion, adhesions, loose bodies, arthritis) or MIXED (the commonest after trauma).
- The elbow is especially PRONE to stiffness because of its highly congruent articulation, the intimate capsule/brachialis relationship, and a tendency to capsular contracture and HETEROTOPIC OSSIFICATION after injury (or after burns/head injury).
- PREVENTION is paramount: STABLE internal fixation that permits EARLY active MOTION, and avoidance of prolonged immobilisation, are the most important steps to prevent stiffness (and passive mobilisation does NOT cause stiffness, a corrected old belief).
- NON-OPERATIVE treatment (a dedicated therapy program with STATIC PROGRESSIVE or DYNAMIC splinting) can recover useful motion, especially early/soft contractures; surgery is considered when a functionally limiting contracture persists despite therapy.
- OPERATIVE release (arthrolysis) - open (e.g. the lateral 'column' procedure / medial approach) or ARTHROSCOPIC - releases the contracted capsule, removes loose bodies/osteophytes and excises mature heterotopic ossification; ulnar-nerve decompression/transposition is added for severe flexion contractures or pre-existing ulnar symptoms. It reliably improves the arc (mean gains around 50 degrees) but contracture/HO can recur.
- “Quote the functional arc: 30-130 degrees flexion (100-degree arc) and 50-50 pronation-supination - the target of treatment.
- “Classify the cause as extrinsic/intrinsic/mixed (Morrey); HO is an extrinsic cause and should be excised once MATURE.
- “Prevent stiffness with stable fixation + early motion; for established contracture, therapy/splinting first, then arthrolysis (open or arthroscopic) - protect the ulnar nerve.
The elbow's highly congruent articulation, the brachialis lying directly on the anterior capsule, and a strong tendency to capsular contracture and heterotopic ossification after trauma (and after burns/head injury) make post-traumatic stiffness common.
The ulnar nerve is at risk both from the stiffness itself (a tight flexion contracture tethers it) and during release. Decompress/transpose it for severe flexion contracture or pre-existing ulnar symptoms when operating.
The Functional Arc
Morrey defined a functional arc of elbow motion - the range needed for most activities of daily living: roughly 30 to 130 degrees of flexion (a 100-degree arc) and 50 degrees each of pronation and supination. Most daily tasks (eating, personal care, using devices) fall within this range, so loss of motion within the functional arc - particularly terminal extension and flexion to reach the mouth/face - is what disables patients. Treatment aims to restore at least this functional arc.
Classification & Causes
The Morrey classification divides causes by their location relative to the joint surface:
- Extrinsic - pathology outside the articular surface: capsular contracture, collateral- ligament contracture, heterotopic ossification (HO), and skin/muscle contracture. The articular cartilage is preserved, so these respond well to release.
- Intrinsic - pathology of/within the joint: articular incongruity (intra-articular malunion), adhesions, loose bodies/osteophytes, and post-traumatic arthritis.
- Mixed - both, which is the commonest picture after significant elbow trauma (the intra- articular injury drives a secondary capsular contracture).
| 0 | 1 |
|---|---|
| Extrinsic | Anterior/posterior capsular contracture; collateral-ligament contracture; heterotopic ossification; skin/burn contracture |
| Intrinsic | Intra-articular malunion/incongruity; loose bodies; osteophytes; chondral damage / post-traumatic arthritis; adhesions |
| Predisposing | Severe/complex fractures, prolonged immobilisation, associated head injury or burns (HO risk), infection |
Prevention & Assessment
The single most effective strategy is prevention: achieve stable internal fixation of elbow injuries that allows EARLY ACTIVE MOTION, and avoid prolonged immobilisation. The evidence also corrects two old myths - heterotopic ossification is not inevitably a bad prognostic feature, and passive mobilisation does not cause elbow stiffness. A supervised early-motion therapy program after injury or surgery is central.
- Measure active and passive flexion-extension and pronation-supination; note the end-feel (soft = capsular/soft tissue; hard = bony block/HO/malunion)
- Radiographs +/- CT for malunion, loose bodies, osteophytes and heterotopic ossification (and its maturity)
- Assess the ulnar nerve clinically (and the skin/soft tissues)
- Soft end-feel + normal joint -> extrinsic (capsular) - good for release/splinting
- Hard end-feel / articular incongruity / HO bridging -> intrinsic or HO - needs bony work
- Often mixed - plan to address both
Management
For early or modest contractures, a dedicated therapy program with static progressive or dynamic (turnbuckle) splinting applies prolonged, low-load stretch to remodel the contracted capsule and can recover useful motion - best when started early and for soft/extrinsic contractures. This is the first line before considering surgery.
Open contracture release reliably improves the arc - one large series reported a mean gain of about 52 degrees of flexion-extension and a return to a functional arc in most patients. However, patients must be counselled that contracture and HO can recur (radiographic HO recurrence ~14%), a subsequent complication occurs in around 10%, and some patients need or elect a second procedure to gain more motion. Post-operative early motion and splinting are essential to maintain the gains.
Evidence & Key Studies
Posttraumatic stiff elbow
- Reviews the magnitude, causes, pathology, prevention and treatment of post-traumatic stiff elbow across 40 studies.
- Simple measures - internal fixation, avoiding immobilisation in flexion, and early motion - are the most important steps to prevent stiffness; conservative treatment helps in selected cases.
- Disproves two beliefs: that heterotopic ossification is necessarily a bad prognostic feature, and that passive mobilisation causes elbow stiffness.
Open surgical elbow contracture release after trauma: results and recommendations
- In 103 patients, contracture release produced a significant mean increase in the flexion-extension arc of 52 degrees, restoring a functional arc in most.
- Heterotopic ossification recurred radiographically in 14%, another complication occurred in 10%, and 11% elected a secondary procedure for more motion.
- Patients with severe preoperative contracture may benefit from concomitant ulnar-nerve decompression; HO prophylaxis did not affect HO recurrence or final motion in this series.
According to PubMed, the prevention principles and the corrected myths come from the cited Mittal review, and the contracture-release outcomes/complications from the cited Haglin/Egol series. The functional arc (30-130 degrees) and the Morrey extrinsic/intrinsic/mixed classification are standard, well-established teaching. (See also our Heterotopic Ossification, Supracondylar/Distal Humerus and Terrible Triad material.)
Clinical Decision Scenarios
Practise clinical reasoning and management decisions out loud
“A 40-year-old has a stiff elbow six months after a complex fracture, with a flexion-extension arc of 50 to 100 degrees. How do you assess and classify the stiffness, and what is the functional arc you are aiming for?”
“Conservative treatment fails to restore functional motion. How would you manage this surgically, what would you do about heterotopic ossification and the ulnar nerve, and what outcomes would you quote?”
Mnemonics & Memory Aids
STIFF
Hook:A STIFF elbow: prevent it, type it, image it, aim for the functional arc, then free it.
RELEASE
Hook:RELEASE the stiff elbow: capsule, HO, approach, ulnar nerve, articular surface, splint, expect recurrence risk.
Functional arc
- 30-130 degrees flexion (100-degree arc) + 50-50 pronation/supination
- Loss within this arc (terminal extension, flexion to face) disables
- Treatment aims to restore at least the functional arc
Classify (Morrey)
- Extrinsic: capsule/collateral contracture, HO, skin (joint surface preserved)
- Intrinsic: articular incongruity/malunion, loose bodies, osteophytes, arthritis, adhesions
- Mixed: both - commonest after trauma
Prevent & assess
- Prevent: stable fixation + EARLY motion; avoid prolonged immobilisation
- Assess ROM + end-feel (soft = capsular, hard = bony/HO); CT for HO/loose bodies/malunion; check ulnar nerve
- Myths corrected: HO not always bad prognosis; passive mobilisation does NOT cause stiffness
Treat
- Therapy + static progressive/dynamic splinting first
- Arthrolysis (open column/medial or arthroscopic): release capsule, remove loose bodies, excise mature HO; +/- ulnar nerve decompression
- Outcomes ~50 deg gain; recurrence/HO ~14%; early motion + splinting postop