We used fluoroscopy to study the kinematics of the knee in 37 patients with posterior cruciateretaining total knee arthroplasty (TKA) while performing successive deep passive knee bends manually.
Posterior femoral rollback and tibial rotations were analysed using fluoroscopic photographs taken in the sagittal plane at full extension and flextion.
In 40 knees (93.0%), posterior femoral rollback was observed. In 28 knees (65.1%), both posterior femoral rollback and tibial rotations were observed. The mean postoperative range of motion was greatest (121°) in the latter subgroup.