Is High-Flexion Total Knee Arthroplasty a Valid Concept? Bilateral Comparison With Standard Total Knee Arthroplasty

50 patients scheduled for simultaneous bilateral total knee arthroplasty had one knee randomized to replacement with a high-flexion, posterior-stabilized LOSPA total knee system, and one knee randomized to replacement with a standard, posterior-stabilized P.F.C. Sigma total knee system. The purpose of this study was to determine if the LOSPA device offered significantly increased knee flexion and improved clinical outcome scores compared to a standard P.F.C. Sigma device, with no significant differences in radiographic alignment or development of radiolucency. After 2 years, no significant differences between groups were observed in all assessed outcomes.