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    Surgery: Limb Length Discrepancy

    Epiphysiodesis and bone lengthening for pediatric limb discrepancy: techniques, postoperative course and recovery. Dr. Priano, Milan.

    Epiphysiodesis or lengthening procedures

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    Surgical Techniques

    Temporary Epiphysiodesis (Eight-plate)

    Minimally invasive technique that temporarily modulates growth of the longer limb by placing small plates on the growth plates. Residual growth of the shorter limb allows progressive equalization. This is the technique I routinely use in this indication, with good results, though it is not the only possible solution.

    When it is used

    Moderate discrepancies in children with adequate residual growth. Thresholds in centimetres are orientative: the decision integrates the predicted discrepancy at the end of growth, skeletal age, the cause and the functional impact.

    Recovery

    Weight bearing is usually resumed early. Correction occurs gradually over months. Plates are removed once equalization is achieved, with timing decided at follow-up.

    Definitive Epiphysiodesis

    Permanent closure of the growth plate through drilling or curettage. Technically simpler than the eight-plate but irreversible.

    When it is used

    Moderate discrepancies when timing is well defined and a second removal procedure is not desired.

    Recovery

    Usually quick recovery. No second removal surgery needed.

    Bone Lengthening (external fixator or motorised intramedullary nail)

    Procedure involving osteotomy and progressive distraction of the bone to achieve the desired lengthening. The motorised intramedullary nail is a modern alternative to the external fixator.

    When it is used

    Larger discrepancies or situations where epiphysiodesis is not feasible. Here too, thresholds in centimetres are orientative and must be read together with age, cause and the family's expectations.

    Recovery

    A long and demanding pathway. The distraction rate is indicatively around 1 mm per day for the lower limb and about 0.5 mm per day for the upper limb, split through the day and adjustable according to tolerance, pain, stiffness and the quality of the bone regenerate. Rehabilitation accompanies the whole lengthening phase.

    Postoperative Overview

    Technique choice depends on the discrepancy predicted at the end of growth, on age, on the underlying cause and on the individual context. Planning is based on clinical assessment and dedicated imaging with limb length measurement, integrated with an estimate of residual growth. The course described below is an indicative pathway, personalised after surgery.

    Recovery Pathway (indicative)

    Note: This is an indicative pathway, personalised after surgery. Some elements are relatively stable (goal of the procedure, approximate hospital stay, presence of a cast or brace); others depend on the individual case (weight bearing, range of motion, imaging, sport, hardware removal, follow-up intervals) and on the surgical technique chosen.

    1. Hospital stay

      Epiphysiodesis: usually day-surgery. Lengthening: short hospital stay for implantation of the fixator or nail.

    2. First weeks

      Epiphysiodesis: early resumption of daily activities. Lengthening: initial latency phase, then start of distraction according to the surgeon's schedule, split through the day.

    3. Second month

      Epiphysiodesis: normal life, with periodic X-ray checks to monitor correction. Lengthening: active distraction phase, with daily work on movement and muscle tone.

    4. Third month

      Lengthening: the duration of distraction and of the subsequent consolidation depends on the site, age, technique, quality of the bone regenerate and the clinical and radiographic course; it cannot be calculated with a fixed formula.

    5. Return to sport

      Indicative pathway. After epiphysiodesis, activities are usually resumed early, but sport and impact activities are reintroduced gradually based on pain, gait and follow-up, not automatically and not tied to hardware removal. After lengthening, sport is resumed when consolidation and functional recovery allow.

    6. Follow-up

      Epiphysiodesis: periodic checks until plate removal. Lengthening: clinical and radiographic checks during distraction, with frequency modulated on the treatment phase, tolerance and the behaviour of the regenerate; then more spaced checks during consolidation.

    Possible Complications

    Epiphysiodesis: under/overcorrection (rare). Lengthening: pin infection, joint stiffness, premature or delayed consolidation, fracture after hardware removal. It is a demanding pathway requiring specific experience and a committed family.

    For parents

    Limb Length Discrepancy: condition information page

    Causes, diagnosis, conservative options and when surgery is considered.

    Questions about this surgery?

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