2.Case report
A 53-year-old woman underwent cementless mobile-bearing Oxford partial knee phase 3 (Biomet Orthopaedics) by the senior author in 2012 for anteromedial osteoarthritis. One year after an uneventful postoperative recovery, the patient fell on the ground level, while walking on the street. A minimally displaced medial femoral condyle fracture was diagnosed without ligamentous instability, and a closed reduction and percutaneous fixation with 6.5 mm cannulated cancellous lag screws was performed [7]. Prior to the fracture, the patient’s Oxford Knee Score (OKS) was 46. After the fracture healing, her OKS was 42. In 2014, the patient had a second fell at ground level, which resulted in the Unified Classification System (UCS) type C supracondyllary femoral fracture [10] (Figure 1 ). Both femoral and tibial components seemed well-fixed, and insert dislocation was not observed in x-rays. We performed an open reduction and internal fixation and used compression screws and anatomical distal femoral locking plate for fixation (Figure 2 ). Active and passive range-of-motion exercises were initiated immediately after the surgery. Union was observed at the fracture site at 12 weeks on x-rays, and full weight-bearing was allowed. The patient had 1300 range of motion and was able to walk independently 6 months after surgery. Four years after surgery, the implants were still well-fixed, and OKS was 36 (Figure 3 ).