Continuous passive motion and its effects on knee flexion after total knee arthroplasty in patients with knee osteoarthritis. - Liao, Chun-De; Huang, Yi-Ching; Lin, Li-Fong; Chiu, Yen-Shuo; Tsai, Jui-Chen; Chen, Chun-Lung; Liou, Tsan-Hon (Knee Surgery, Sports Traumatology, Arthroscopy, 2016)