Anteroposterior radiographs of left knee in 12-year-old boy with stage V Blount disease. A, Preoperative radiograph showing angle of depression of medial tibial plateau of 50 degrees and tibial varus angle of 95 degrees. B, At 10 months after surgery note recurrent mechanical varus of 5 degrees; the angle of depression of the medial tibial plateau was maintained at 25 degrees but the tibial varus angle increased to 90 degrees because of fusion of the medial tibial physis with an open lateral physis.