Valgus deformity following derotation osteotomy to correct medial femoral torsion

The clinical records and radiographic files of 79 patients who underwent bilateral distal femoral derotation osteotomies for severe persistent medial femoral torsion at the Alfred I. duPont Institute from 1967 to 1983 were reviewed. We excluded patients with neuromuscular disorders and those with less than 2 years of postoperative follow-up, including satisfactory radiographs at our institution. Fourteen patients were included in the study. Following the osteotomy, two of these patients developed progressive valgus deformity that was the result of medial femoral overgrowth. Both patients required a second surgical procedure to correct this deformity. To our knowledge, this progressive angular deformity has not been reported previously.