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Predicting Rates of Angular Correction After Hemiepiphysiodesis in Patients With X-Linked Hypophosphatemic Rickets.

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Area of Science:

  • Orthopedics
  • Pediatric Endocrinology
  • Skeletal Dysplasias

Background:

  • X-linked hypophosphatemic rickets (XLH) commonly causes coronal plane knee deformities in children.
  • Hemiepiphysiodesis is a surgical technique used to correct these deformities in skeletally immature patients.

Purpose of the Study:

  • To compare the rate of angular correction after hemiepiphysiodesis in patients with XLH versus idiopathic cases.
  • To evaluate the effectiveness of hemiepiphysiodesis in correcting coronal plane knee deformities in XLH patients.

Main Methods:

  • Retrospective review of 24 XLH patients and 37 controls undergoing hemiepiphysiodesis.
  • Analysis of standing lower extremity radiographs to measure angular correction (mLDFA, medial proximal tibial angle).
  • Comparison of correction rates, treatment times, and outcomes between XLH and control groups.

Main Results:

  • XLH patients had greater initial femoral deformities (varus and valgus).
  • Femoral deformity correction was 15% to 36% slower in XLH patients compared to controls.
  • XLH patients experienced longer treatment durations, higher rates of overcorrection, and required more secondary procedures.

Conclusions:

  • Hemiepiphysiodesis in XLH patients results in a slower rate of femoral correction, necessitating longer treatment and potentially more interventions.
  • Understanding these differences is crucial for guiding treatment timing and managing expectations for XLH patients with knee deformities.