Fig. 1.

A 59-year-old patient with a history of complex ligamentous injury to the right knee while playing football that was surgically addressed but eventually led to progressive right knee deformity and pain medially that made knee flexion difficult. Anteroposterior (a) and lateral (b) preoperative radiographs demonstrated severe valgus deformity, tricompartmental joint space narrowing and osteophytes, subchondral collapse, and healed proximal fibular fracture with callus formation. Intraoperatively, the medial collateral ligament was grossly attenuated, and the lateral tibial defect was filled with a bone autograft. Postoperatively, anteroposterior (c) and lateral (d) radiographs demonstrated hinged implants with neutral alignment and without complication.