Pre- and postoperative radiographs from one patient each who underwent closed wedge high tibial osteotomy (A) and opening wedge high tibial osteotomy (B). (A) The distance between the anterior border of the tibial tuberosity and the posterior border of the medial tibial condyle is 55.5 mm preoperatively (left) and 62.0 mm postoperatively (right), indicating an increase of 6.5 mm. (B) The distance between the anterior border of the tibial tuberosity and the posterior border of the medial tibial condyle is 64.5 mm preoperatively (left) and 62.0 mm postoperatively (right), indicating a decrease of 2.5 mm.