Intertrochanteric osteotomy (Imhäuser). A, Seating chisel is inserted into neck at right angles to shaft axis. B, Femoral osteotomy removes ventral wedge. C, Chisel is exchanged for blade plate, and femur is derotated. D, Blade plate is fixed to femur with screws. (Redrawn from Parsch K, Zehender H, Bühl T, Weller S: Intertrochanteric corrective osteotomy for moderate and severe chronic slipped capital femoral epiphysis, J Pediatr Orthop B 8:223, 1999.) SEE TECHNIQUE 36.28.