Oakeshott, Roger DavidStiehl, James B.Komistek, Richard A.Anderson, Dylan T.Haas, Brian D.2006-06-232006-06-232003Journal of Arthroplasty, 2003; 18 (8):1029-10370883-5403http://hdl.handle.net/2440/6718Using video fluoroscopy, 10 subjects having a mobile-bearing posterior cruciate-retaining total knee arthroplasty were analyzed to determine their in vivo kinematic patterns. Under weight-bearing conditions, while in extension, the average contact position was posterior to the mid-tibia sagittal plane with posterior translation of both condyles to 60° of flexion, followed by anterior translation to 120° of flexion. Under non-weight-bearing conditions, the average condylar contact positions were significantly more anterior from full extension to 90° of knee flexion (P=.01). The average range of motion was 129° under non-weight-bearing conditions and 119° during weight-bearing. Although subjects in this study exhibited variable motion patterns, they are accommodated by the unconstrained optimized articulation of this highly conforming mobile-bearing implant.enknee; kinematics; mobile bearing; cruciate retentionJournal article002003163910.1016/S0883-5403(03)00369-30001874297000132-s2.0-0348048883