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. 2006 Sep;29(9 Suppl):S49-52.

The P.F.C. sigma RP-F TKA designed for improved performance: a matched-pair study

Sanjay K Gupta  1 , Amar S Ranawat, Vineet Shah, Bashir A Zikria, Joseph F Zikria, Chitranjan S Ranawat
Affiliations
  • PMID: 17002149

The P.F.C. sigma RP-F TKA designed for improved performance: a matched-pair study

Sanjay K Gupta et al. Orthopedics. 2006 Sep.

Abstract

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 degrees 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 degrees, compared with 6 degrees in the rotating-platform group (P =.0011). The mean increase in active ROM in patients who had less than 120 degrees of preoperative motion was 27 degrees in the Sigma RP-F group, compared with 16 degrees 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.

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