抄録
Objective: The PFC Sigma rotating-platform, high-flexion (RP-F) total knee prosthesis was designed to permit 155° of flexion without compromising wear or polyethylene contact stresses and without patellofemoral maltracking or instability. We report the short-term clinical results of the PFC Sigma RP-F total knee prosthesis.
Methods: Total knee arthroplasty (TKA) was performed on 46 knees using the PFC Sigma RP-F total knee prosthesis from March 2005 to June 2008. Forty-four knees had osteoarthritis (OA) and two knees had rheumatoid arthritis (RA). The mean age at the time of surgery was 75.2 years. We evaluated the femorotibial angle (FTA), the Japanese Orthopaedic Association knee score (JOA score), the range of motion (ROM), and complications and also carried out the Knee Society TKA roentgenographic evaluation.
Results: The average preoperative FTA was 188.6° and the postoperative FTA was 174.9°. The average preoperative extension was -11.2° and the preoperative flexion was 111.1°; the postoperative extension was -2.1° and the postoperative flexion was 121.1°. The preoperative JOA score was 54, and this improved to 85.6 postoperatively. In the postoperative Knee Society TKA roentgenographic evaluation, the mean α angle was 95.6°, the β angle was 89.5°, the γ angle was 1.8°, and the σ angle was 87.2°. One knee suffered a rotating platform dislocation.
Conclusion: From this study, the short-term clinical results of TKA using the PFC Sigma RP-F total knee prosthesis were satisfactory.
