Sugioka's Modified Hungria-Kramer intertrochanteric osteotomy in the treatment of severe slipped capital femoral epiphysis.

From May 1990 to November 1997, 24 cases of severe slipped capital femoral epiphysis were treated by an osteotomy that is a modification of the Hungria-Kramer intertrochanteric osteotomy proposed by Sugioka (Hungria-Kramer-Sugioka osteotomy or HKS osteotomy). The degree of displacement as seen on the frog-leg lateral radiograph of the proximal femur was measured according to the deviation of the longitudinal axis of the epiphysis from the center line of the neck (Fish classification). All hips were considered as grade III and underwent HKS osteotomy. Sugioka's radiographic study (true AP view with the limb internally rotated until the patella is perpendicular to the x-ray beam, and lateral view with the hip in 90 degrees flexion and 45 degrees abduction) was performed before surgery to show that the real direction of the slip was posterior in relation to the neck. Clinical results were assessed according to Merle-D'Aubigné and Postel system modified by Charnley (hip score system that takes into consideration pain, gait, and joint motion). Roentgenographic results were considered good if none of the following was present: joint space decreased by more than 2 mm (chondrolysis), avascular necrosis of the femoral head, neck-shaft angle of less than 120 degrees, nonunion at the osteotomy site, and a epiphyseal plate still open. Follow-up varied from 31 to 120 months (average 65.1 months).