Fig. 1

Preoperative data. A-B. Appearance of the right lower limb; C. Mechanical axis of the right lower limb is 140˚; D. The sagittal plane angle is 20˚ forward; E. The lateral proximal femoral angle is 98.7˚ and mechanical lateral distal femoral angle is 108.4˚; F. The mechanical medial proximal tibia angle is 78.3˚ and mechanical lateral distal tibial angle is 90.2˚; G. Knee valgus stress position X-ray shows medial knee joint gap can be opened