Elbow Stiffness & Contracture (Post-traumatic Arthrofibrosis)

Post-traumatic stiffness is one of the commonest and most disabling complications of elbow trauma; with the shoulder's opposite problem, the elbow is the joint most prone to losing motion after injury or surgery. Even modest losses matter because the elbow positions the hand in space: lose terminal extension and flexion and the patient cannot reach the floor or the face.

Who gets it. Stiffness is common after significant elbow trauma - intra-articular distal humerus and radial-head fractures, fracture-dislocations such as the terrible triad, and any injury treated with prolonged immobilisation. An associated head injury, burns, high-energy or complex trauma, and delayed or repeated surgery are the settings in which heterotopic ossification is most likely to compound it.

A spectrum, judged by function. Severity runs from a mild loss of terminal extension to a functionally fused elbow, and it is the functional impact rather than the absolute number of degrees that drives treatment.

Largely preventable. The biggest determinant is how the original injury was managed: stable fixation that allowed early motion, against prolonged immobilisation.

What counts as enough motion. Morrey defined a functional arc - the range needed for most activities of daily living - as roughly 30 to 130 degrees of flexion, a 100-degree arc, with 50 degrees each of pronation and supination. Most daily tasks fall inside it, so motion lost within the functional arc, particularly terminal extension and the flexion that brings the hand to the mouth and face, is what disables patients. Treatment aims to restore at least this much.

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The 1981 arc is a floor, not a target. Morrey's study was published in 1981 and its fifteen activities did not include a keyboard, a mouse or a mobile phone. Repeating the work with three-dimensional optical tracking, Sardelli found that functional elbow motion for contemporary tasks is greater than previously reported: positional tasks spanned 27 to 149 degrees of flexion, and using a mobile phone alone demanded a 130-degree arc reaching 142 degrees of flexion, more than the classic ceiling. Typing required the most pronation (65 degrees), opening a door the most supination (77 degrees), and the largest rotation arc, 103 degrees, came from using a fork.

Why this changes the conversation rather than the operation. Restoring 30 to 130 degrees is still a reasonable surgical goal and still the number to quote for the classic teaching. But a patient counselled that they have "a functional arc" may still be unable to hold a phone to their ear or type comfortably, and that is a legitimate complaint rather than an unrealistic expectation. Ask what the patient actually needs to do before deciding their motion is adequate; the deficits modern life exposes are in flexion beyond 130 degrees and in pronation.

Three joints inside one capsule. The ulnohumeral, radiocapitellar and proximal radioulnar articulations share a single, highly congruent capsule, which tolerates very little incongruity or capsular thickening before motion is lost.

The brachialis sits on the front of it. With no plane between muscle and anterior capsule, injury produces a haematoma that goes on to fibrosis and contracture of that capsule, and the same haematoma is the substrate for anterior heterotopic ossification.

The capsular response. The injured capsule becomes thickened and fibrotic, with disordered collagen and increased myofibroblasts, and shortens across the joint. That shortened capsule is the extrinsic contracture.

Heterotopic ossification. Osteoprogenitor cells in injured soft tissue undergo aberrant ossification, a process amplified by central nervous system injury, burns and high-energy trauma. Bridging HO can mechanically block motion.

The intrinsic block, and why it is rarely alone. Incongruity from a malunion, loose bodies, osteophytes and chondral loss obstruct the joint from within. The two mechanisms usually coexist, because the intra-articular injury drives a secondary capsular contracture on top of the articular damage.

The Morrey classification divides causes by their location relative to the joint surface, and the division is worth making because it decides what the operation has to do.

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Extrinsic. The pathology lies outside the articular surface: capsular contracture, collateral-ligament contracture, heterotopic ossification, and skin or muscle contracture. The articular cartilage is preserved, so these respond well to capsular release and splinting, and a soft end-feel typically points here.

Intrinsic. The pathology is of or within the joint: articular incongruity from an intra-articular malunion, intra-articular adhesions, loose bodies and osteophytes, and post-traumatic arthritis. A hard end-feel, or a bony block on imaging, points here, and bony work rather than capsular release alone is required.

Mixed. Both together, and the commonest picture after significant elbow trauma. Plan to address both the joint surface and the contracted capsule.

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The patient is typically referred weeks to months after an elbow injury or its surgery, complaining of lost motion and functional difficulty rather than pain alone.

History. Establish the original injury and how it was treated - fracture type, fixation, and how long the elbow was immobilised - and then what the patient can no longer do: reaching the face and mouth is a flexion loss, reaching the floor or a back pocket an extension loss. Ask about paraesthesiae in the ring and little fingers, common with a flexion contracture, and about the risk flags for heterotopic ossification.

Examination. Measure active and passive flexion-extension and pronation-supination, against the functional arc and against the other side, and note whether the block is at terminal extension, terminal flexion or both. Look for a fixed flexion deformity, examine the ulnar nerve (Tinel's sign, sensation, intrinsics), and assess the skin and soft-tissue envelope.

The end-feel. A soft end-feel is capsular, and extrinsic. A hard end-feel is a bony block - heterotopic ossification, an osteophyte, a malunion - and intrinsic. It is the bedside finding that separates the two, and it should agree with the imaging before a plan is made.

Radiographs. Anteroposterior and lateral views come first and screen for the bony causes: malunion, joint incongruity, osteophytes, loose bodies, heterotopic ossification and established arthritis.

CT. With three-dimensional reconstruction, CT maps heterotopic ossification, loose bodies and articular incongruity precisely, and it shows whether the ossification is mature. That makes it the single most useful investigation for planning, because excising immature HO - still active on imaging or bone scan - increases recurrence, so the timing of the release follows the maturity of the bone.

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The ulnar nerve. Assess it clinically, with nerve conduction studies as an adjunct. A neuropathy from tethering or compression is what decides whether decompression or transposition is added to the release.

Examination under anaesthesia and arthroscopic assessment. On the table these separate a soft capsular block from a fixed bony one, confirm which pathology dominates, and let the release be tailored to it.

First line is not an operation. For early or modest contractures a dedicated therapy programme with static progressive or dynamic (turnbuckle) splinting applies prolonged, low-load stretch to remodel the contracted capsule, and can recover useful motion. It works best when started early and in soft, extrinsic contractures.

Arthrolysis. When a functionally limiting contracture persists despite therapy, contracture release is offered: open - the lateral column procedure, or a medial or combined approach - or arthroscopic in suitable cases. The operation releases the contracted anterior and posterior capsule, removes loose bodies and impinging osteophytes, addresses articular incongruity, and excises mature heterotopic ossification. Ulnar-nerve decompression or transposition is added for a severe flexion contracture (greater than about 90 to 100 degrees) or for pre-existing ulnar symptoms; the nerve is already tethered by the contracture, and it is stretched again by the flexion regained on the table.

Localise the block by direction. "Release the capsule" is too vague, and the direction of the deficit tells you which compartment has to be opened.

• Loss of terminal extension (a fixed flexion deformity): a contracted, scarred anterior capsule and brachialis, with posterior bony impingement as olecranon-tip osteophytes catch in the olecranon fossa. Release the anterior capsule and clear the posterior compartment - excise the olecranon osteophyte, debride the olecranon fossa.
• Loss of terminal flexion: a contracted posterior capsule and triceps, with anterior bony impingement from coronoid and radial-head osteophytes in the coronoid and radial fossae. Release the posterior capsule and clear the anterior compartment.

The lateral column procedure exploits exactly this: the anterior capsule is reached over the anterior column to restore extension and the posterior structures over the posterior column to restore flexion. Most post-traumatic elbows have lost both and need both compartments addressed.

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Heterotopic ossification at the release. Prophylaxis - an NSAID such as indometacin, or low-dose radiotherapy - is widely used in high-risk cases, but be honest about how thin the support is: in the 103-patient release series in the Evidence Base below, prophylaxis changed neither the rate of HO recurrence nor the final arc of motion. Established, mature HO that blocks motion is excised at the release, and operating once it is mature reduces recurrence rather than abolishing it. HO matters when it blocks motion, not merely because it is visible on the radiograph.

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Salvage for a destroyed joint. Interposition arthroplasty for the young patient whose articular surface has been destroyed, and total elbow arthroplasty for the older, lower-demand arthritic elbow. Neither is an alternative to releasing a contracture over an intact joint.

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What release achieves, and what to say at consent. A series of 103 patients undergoing open release gained a mean of about 52 degrees of flexion-extension, and most were returned to a functional arc. Counsel honestly against that: radiographic HO recurrence in 14%, another complication in about 10%, and about 11% needing or electing a second procedure for more motion.

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Complications arise from the established stiffness, and from the release surgery used to treat it.

Prevention beats release. The single most effective strategy is to stop the contracture forming: stable internal fixation of the elbow injury so that early active motion is possible, and avoidance of prolonged immobilisation. A supervised early-motion therapy programme after the injury or its surgery is central to that.

If the elbow must be rested, rest it in extension. A flexion contracture is the harder one to recover, so immobilise in extension rather than flexion where there is a choice.

Two beliefs to abandon. Heterotopic ossification is not inevitably a bad prognostic feature, and passive mobilisation does not cause elbow stiffness - the old prohibition on gentle passive motion does not survive the evidence.

Global epidemiology. The stiff elbow is a complication rather than a disease, so its distribution tracks the injuries and the treatment that precede it. Where distal humerus, radial head and complex fracture-dislocations are managed with stable fixation and mobilised within days, contracture is uncommon; where fractures are treated in prolonged plaster or present late, it is routine. This is why the largest post-traumatic stiff-elbow series come from high-volume trauma units in India, China and Brazil, while the North American and European literature is weighted towards release technique and arthroplasty. Reading only the latter gives a distorted picture of how the condition arises.

Where the guidance comes from. There is no dedicated AAOS, NICE, BOA or EFORT guideline on elbow stiffness, and it is more honest to say so than to imply consensus. What exists is:

• Narrative and systematic reviews - such as the review cited on this page that explicitly disproves the "HO is a bad sign" and "passive movement causes stiffness" beliefs.
• Single-institution release series supplying the benchmark figures used at consent - roughly 50 degrees of gain, 10-14% complications, and a real reoperation rate.
• Indirect guidance through fracture standards: BOA/BOAST and AO principles on early stable fixation and early mobilisation are, in practice, the only widely endorsed prevention strategy for this condition.

Registry evidence. The joint registries - NJR, AJRR, AOANJRR, SHAR, Norwegian, NZJR - capture total elbow arthroplasty and nothing else relevant here. Contracture release is not a registered procedure anywhere, so there is no population denominator for how often it is done, how often it fails, or how often it is repeated. Where registries do contribute is at the endpoint: elbow arthroplasty survivorship is markedly poorer than hip or knee, which is precisely why release, debridement and interposition retain a place in the young stiff elbow rather than converting early to a replacement.

A practice point that travels. The single intervention with the strongest global claim is not an operation: it is stable fixation permitting early active motion, and the avoidance of prolonged immobilisation. That is available in every health system, costs nothing, and prevents more disability than any release technique recovers.