Fig. 1A–B.

Replots of Figure E-1 from the electronic appendix to Li et al. [11] show contact positions (AP translations in the [A] medial and [B] lateral compartments) of nine individual patients with a NexGen^® CR total knee implant performing a lunge maneuver under fluoroscopic surveillance. The curves for the contact positions over 90° of flexion have different shapes for each subject, varying in magnitude of displacements, direction, and changes in direction.