Fracture involving the lower femoral epiphysis in growing children are relatively uncommon. We have experienced seven cases of fracture of this type. Three cases which had valgus deformity of the knee at the time of the initial injury showed good remolding. Two which had had intraarticular fracture showed the shortening of the femur and one of them had been performed by the lengthening of the femur. The purpose of this paper is to discuss fractur involving the lower femoral epiphysis from both the clinical and the experimental point of view.