Outcomes of Temporary Hemi-Epiphysiodesis Using a New Device for The Treatment of Pediatric Valgus Knee Deformity: A Preliminary Report

Document Type : RESEARCH PAPER


1 Department of orthopedics, Taleghani Hospital Research Development Committee, Shahid Beheshti University of Medical Sciences, Tehran, Iran

2 Akhtar Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran

3 Shohada Tajrish Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran

4 Gorgan University of Medical Sciences, Gorgan, Iran


Background: This study aimed to evaluate the efficacy of hemi-epiphysiodesis using a new device (X-plate) for the
correction of genu valgum.
Methods: In total, 22 children with a total of 34 pathologic knee valgus deformities underwent the procedure and
were followed up 25.3 months on average.
Results: The mean time to clinical correction of genu valgum was 10.9±2.2 months. Furthermore, the mean
preoperative anatomic Lateral Distal Femoral Angle (aLDFA) and mechanical Tibia Femoral angle (mTFA) were
obtained at 75.1±3.8 and 6±2.8 degrees, respectively. When clinical correction of the deformity was achieved, the
mean of aLDFA and mTFA corrections were determined at 8.9±5.3 and 6.5±3.2 degrees, respectively. The mean
speed of aLDFA and mTFA corrections were estimated at 0.8±0.45 and 0.6±0.3 degrees per month, respectively.
The postoperative aLDFA and mTFA were measured at 84±4.2 and -0.8±2.9 on average. With a mean of 25.3±14.5
months at final follow-up, there were 6 (17.6%) mild valgus knees, 26 (75.5%) normal alignment knees, and only 2
(5.9%) mild varus knee within an acceptable clinical limit.
Conclusion: Hemi-epiphysiodesis using X-plate at the distal physis of the femur is an effective and safe method for
the treatment of valgus knee deformity in children.
Level of evidence: IV


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Volume 9, Issue 5
September and October 2021
Pages 536-542
  • Receive Date: 23 June 2020
  • Revise Date: 02 November 2020
  • Accept Date: 27 December 2020