Axial rotation motion of the polyethylene bearings about the central peg on the tibial baseplates. The red lines indicate the rotational motion of the polyethylene mobile bearing axis projected onto the tibial baseplate for each flexion position. The gray circles indicate the computed center of rotation for every individual TKR, and the white cross indicates the mean and standard deviation of the centers of rotation. There were no significant differences between the nominal and outlier TKR in each group.
Harman et al. BMC Musculoskeletal Disorders 2012 13:206 doi:10.1186/1471-2474-13-206