Fig. 4.

A 66-year-old woman visited our clinic with pain in both knees for 7 years (A). We performed left total knee arthroplasty using Zimmer LPS-Flex Mobile (B). At the last follow up (14 months after total knee arthroplasty), flexion contracture of left knee joint was 0°, and KSKS was 96 points, which was 50 points preoperatively, and KSFS was 95 points, which was 48 points preoperatively, and WOMAC score was 12 points, which was 85 points preoperatively. Maximal flexion angle of left knee joint was 138°, which was 120° preoperatively, and cross-legged sitting position and kneeling position were all possible (C). KSKS: Knee Society Knee Score, KSFS: Knee Society Functional Score, WOMAC: Western Ontario and McMaster Universities Arthritis Index.