Fig. 3From: Effect of medial open wedge high tibial osteotomy on progression of patellofemoral osteoarthritisMerchant view radiographs of a 58-year-old woman (case 1). A Preoperative radiograph showing Kellgren–Lawrence grade 2 patellofemoral joint osteoarthritis. B Follow-up radiograph 5 years after surgery showing Kellgren–Lawrence grade 4 patellofemoral joint osteoarthritisBack to article page