Fig. 4

Example of preoperative planning for hybrid closed high-tibial osteotomy. a The hinge point was set as a point at a ratio of 1:3 during planning on the standing radiograph. b Planning on the supine radiograph. c A virtual weight-bearing line (vWBL) was drawn by applying the correction angle (17.5°) determined on the standing radiograph to the supine radiograph. d Virtual %WBL (v%WBL) was 76%. %WBL discrepancy (%WBLd) was calculated as 76–62 = 14 (%)