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Heterotopic Ossification of the Elbow

Pathological formation of ectopic bone in periarticular soft tissues of the elbow, a dreaded complication of elbow trauma and surgery. Major risk factors: associated head injury, surgical delay > 48h, repeated surgery. Hastings-Graham classification based on functional impact.

Characteristics

Heterotopic ossification (HO) of the elbow corresponds to the formation of mature lamellar bone in periarticular soft tissues (capsule, muscles, ligaments) that normally do not contain bone tissue [1]. The elbow is the joint most frequently affected by HO after trauma, with an incidence of 3 to 45% depending on the series. The pathophysiology involves aberrant differentiation of mesenchymal stem cells into osteoblasts, stimulated by local and systemic factors.

Major risk factors include surgical delay greater than 48 hours, severe head injury (HO incidence of 10-20%), extensive burns, repeated surgery and complex fracture-dislocations [2]. Prophylaxis is essential: NSAIDs (indomethacin 75 mg/day for 6 weeks) or prophylactic radiation at a single dose (7 Gy) within 72 hours post-operatively. The Hastings-Graham classification evaluates functional impact.

Natural history occurs in three phases: active formation (0-6 months), maturation (6-12 months) and stabilization (> 12 months). Surgical excision is indicated only once maturity is reached (normalized ALP levels, cold bone scan), typically after 12-18 months, to avoid recurrence [3].

  • HO develops in periarticular soft tissues of the elbow: anterior capsule (causing flexion contracture), brachialis muscle (main muscular site), collateral ligaments, posterior subcutaneous space. Histologically, it is mature lamellar bone with cortex, medulla and hematopoietic marrow, distinct from disorganized dystrophic calcifications.
  • HO formation follows three phases: inflammatory phase (D+0 to W4-W6) with mesenchymal proliferation and osteoid tissue formation, maturation phase (W6 to M6-M12) with progressive mineralization and structuring into lamellar bone, and stabilization phase (> M12-M18) with stable mature bone. Premature excision during the active phase results in near-systematic recurrence.
  • Risk factors: surgical delay > 48h (significantly increased risk), severe head injury (3-5× risk), extensive burns (> 30% BSA), repeated elbow surgery, complex fracture-dislocation (terrible triad), extensive surgical approach, forced passive mobilization post-operatively, undrained hematoma, male sex, smoking.
  • Complications: severe joint stiffness up to complete ankylosis, nerve compression (ulnar nerve by posteromedial HO in 5-15% of cases), major functional limitation, chronic pain, surgical treatment difficulty (hemorrhagic risk, post-excision recurrence 5-15%, intraoperative neurovascular injuries).

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  1. Class I – No functional limitation

    Radiographically visible heterotopic ossification in periarticular soft tissues of the elbow but without significant functional impact. Joint range preserved beyond Morrey's functional arc. No significant pain. Clinical and radiographic monitoring. No surgical indication. Pharmacological prophylaxis if risk factors for progression.

  2. Class II – With functional limitation

    Ossification causing significant functional limitation. Subtype IIA: flexion-extension limitation (most frequent, anterior and/or posterior HO). Subtype IIB: pronation-supination limitation (lateral or proximal radioulnar HO). Subtype IIC: limitation in both planes of movement. Morrey's functional arc not achieved. Indication for surgical excision at maturity.

  3. Class III – Ankylosis

    Complete elbow ankylosis by continuous transarticular bony bridge. Complete abolition of mobility in flexion-extension and/or forearm rotation. Functionally very disabling situation. Complex surgical excision at maturity with complete arthrolysis and tissue interposition (fascia lata or autologous capsule flap) to prevent recurrence. Immediate and intensive post-operative rehabilitation under continuous anesthesia catheter.

Medical and Surgical Management

  • Prophylaxis in at-risk patients: indomethacin 75 mg/day in two doses for 6 weeks post-operatively (inhibition of prostaglandins and osteoblastic differentiation). Alternative: prophylactic radiation at a single 7 Gy dose within 72 hours post-operatively. Combination of both for very high-risk patients.
  • Surgical excision at maturity: resection of functionally impeding HO once maturity is reached (normalized serum ALP, technetium-99m bone scan showing no uptake). Usual delay of 12-18 months post-trauma. Systematic associated arthrolysis. Recurrence prophylaxis with indomethacin + post-excision radiation.
  • Biological and radiological maturation monitoring: serum alkaline phosphatase (ALP) levels every 6-8 weeks, control radiographs, technetium-99m bone scan to assess HO metabolic activity. ALP normalization and bone scan extinction confirm maturity and authorize surgical excision.

Physiotherapy treatment

  • During active formation phase (0-6 months): GENTLE active mobilization only within the pain-free range. Absolutely prohibit forced passive mobilization and aggressive stretching which stimulate bone formation. Systematic post-session cryotherapy. Low-load static postures if tolerated.
  • Maintaining residual range: static progressive orthoses in extension and flexion worn alternately (2-3 hours each). Very slow tension progression (millimeter increases). Goal: prevent further range-of-motion loss while awaiting HO maturation.
  • Post-surgical excision: immediate mobilization under continuous regional anesthesia catheter. CPM (Continuous Passive Motion) 6-8h/day for 3-4 weeks. Intensive active mobilization multiple times daily. Maximum ROM gain in the first 4 weeks post-excision. Intensive compressive cryotherapy.
  • Monitoring and treatment adaptation: clinical monitoring of ROM progression, screening for reactivation signs (inflammatory pain, ROM loss, local warmth, rising ALP). Adapting rehabilitation intensity to tolerance. Warm water hydrotherapy to facilitate mobilization during the maturation phase.

After the session

You may feel slight fatigue or tightness: this is normal. Continue the exercises taught at home to maintain session benefits.

Questions About Elbow Rehabilitation

When should I start physiotherapy after elbow surgery?

Rehabilitation generally begins between 3 and 21 days after the operation, depending on the type of procedure and the stability of the surgical fixation. For fractures treated with stable internal fixation (screw plate), early mobilization is often authorized from D+3 to D+5 to prevent joint stiffness. In cases of elbow replacement or complex ligament repair, the delay may be extended to 2-3 weeks with initial immobilization in a splint. A systematic review published in the Journal of Shoulder and Elbow Surgery confirms that early mobilization after elbow surgery significantly improves final range of motion without increasing the risk of complications [Hackl et al., 2023] . Your surgeon will advise the optimal timing based on your specific procedure.

What are the goals of elbow rehabilitation?

Elbow rehabilitation pursues several complementary goals, adapted to each phase of recovery. In the initial phase (0-6 weeks), the priority is to restore range of motion in flexion-extension (goal: 30°-130° minimum for daily activities) and in pronation-supination (50° in each direction minimum). In the intermediate phase (6-12 weeks), the focus is on progressive muscle strengthening of the flexors, extensors and rotators of the forearm, as well as restoring joint stability through proprioceptive exercises. In the advanced phase (3-6 months), the emphasis is on functional reintegration: daily activities, work tasks and return to sports. Scientific literature highlights that the minimum functional arc of the elbow (30°-130° of flexion-extension, 50° of pronation and 50° of supination) is necessary to perform 90% of daily activities [Mofidi et al., 2020] . Scar treatment and adhesion prevention complete this comprehensive care approach.

Is elbow rehabilitation painful?

The techniques used are progressive and adapted to your tolerance. The elbow is a joint particularly prone to stiffness and inflammatory reactions: overly aggressive rehabilitation can paradoxically worsen the situation by causing heterotopic ossifications (abnormal bone formations in soft tissues). Exercises must be regular but never forced . The physiotherapist always adapts the intensity to stay below the pain threshold, following the "no pain, more gain" rule specific to the elbow. Gentle, regular active mobilization spread across the day in short sequences is generally preferred to prevent stiffness, with early active mobilization recommended after an elbow injury [Akhtar et al., 2021] . Complementary techniques such as cryotherapy , microcurrents and Novafon vibration therapy also help control pain during sessions.

Scientific sources

Average duration

Maturation waiting phase 12-18 months, post-excision rehabilitation 3 to 6 months

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