1. Surgical trauma to the greater trochanter of the hip of a growing animal, produced by multiple drilling or curettage of the epiphyseal-cartilage plate, results in growth arrest with deformity and shortening of the greater trochanter. There is an associated coxa valga of the neck of the femur.
2. Surgical trauma to the epiphyseal-cartilage plate of the head of the femur by multiple drilling or by curettage uniformly results in growth arrest, which produces a short femoral neck, an irregular contour of the head of the femur, coxa vara, and a functional shortening of the shaft of the femur, as measured from the articular surface of the head to the articular surface of the knee.
3. The operation of drilling the necks of the femora of young children for the purpose of hastening revascularization of the head in cases of Legg-Calvé-Perthes disease is a very questionable procedure.