A and B, Widest part of wedge (at base of neck) is in line with widest part of slip, correcting varus and retroversion components, and Steinmann pin is inserted into femoral neck to control proximal fragment. If wedge is too wide anteriorly, retroversion is overly corrected. Most common mistake is to make wedge too narrow superiorly, resulting in incomplete correction of varus. C and D, Osteotomy is closed, and 5-mm threaded Steinmann pins are inserted from outer cortex of femoral shaft through femoral neck, across osteotomy site, and into femoral head. Pins fix osteotomy; because they cross the physis, they prevent any further slip. SEE TECHNIQUE 36.26.