The press fit condylar P.F.C. Sigma RP-F (rotating-platform, high flexion) knee is designed to provide a range of motion (ROM) of 155° without compromising wear, polyethylene contact stresses, patellofemoral tracking, or stability. The first 50 TKA surgeries using the Sigma RP-F knee performed at the author's institution were matched to 50 rotating-platform knees for age, sex, body mass index, preoperative diagnosis, duration of follow-up, and preoperative ROM to determine the effect of design on postoperative ROM. The mean increase in active ROM in the Sigma RP-F group was 17°, compared with 6° in the rotating-platform group (P=.0011). The mean increase in active ROM in patients who had less than 120° of preoperative motion was 27° in the Sigma RP-F group, compared with 16° in the rotating-platform group (P=.006). With the new P.F.C. Sigma RP-F design, greater ROM can be achieved independent of preoperative ROM.
|Original language||English (US)|
|Issue number||9 SUPLL.|
|State||Published - Sep 1 2006|
ASJC Scopus subject areas
- Orthopedics and Sports Medicine