Hemichondrodiatasis is a technique of closed, gradual, asymmetric distraction of the growth plate to correct angular deformities in growing children. This report describes the technique and the results achieved in 35 operated lower extremity segments, 14 involving the femur and 21 involving the tibia. The best results were achieved in posttraumatic deformities when the bone bridge occupied less than 20%-30% of the epiphyseal plate. The procedure is best performed toward the end of growth, or earlier if a progressive deformity exceeds 15 degrees - 20 degrees.
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