Mid-term Results of Total Knee Arthroplasty Using PFC Sigma RP-F

PURPOSE: We compared the mid-term results after total knee arthroplasty (TKA) using PFC Sigma RP-F mobile model with PFC Sigma PS fixed model. MATERIALS AND METHODS: We analyzed 45 knees that underwent TKA with PFC Sigma RP-Fn (study group) and 45 knees with PFC Sigma PS (control group). The mean follow-up period was 65 months (range, 60-69 months). The evaluation system of the American knee society was used for clinical and radiological assessment. Also, the maximal knee flexion angle was assessed. RESULTS: The mean maximum flexion angle in the study group (135degrees) was greater than that in the control group (125degrees) at the early post-operation & final follow-up period (p=0.033). The range of motion (ROM) in the study group was recovered earlier at the postoperative 6 months, and ROM gain was improved to a greater extent at the final follow-up period (p=0.039). The knee score and function score and radiographic evaluation were no difference between the two groups (p>0.05) at the final follow-up. The two cases of radiolucency in posterior condyle and medial tibial plateau and one case of patellar elongation were seen in the study group. CONCLUSIONS: The PFC Sigma RP-F mobile system appears to facilitate greater maximum flexion angle and ROM gain with two cases of radiolucent line.

Press-Fit Condylar Total Knee Arthroplasty: 5 to 10 year Follow up Evaluation / 대한정형외과학회잡지

PURPOSE: To evaluate the mid-term clinical, radiographic results in P.F.C total knee replacement arthroplasty (TKRA) retrospectively. MATERIALS AND METHODS: Between Aug. 1989 and Jun. 1995, the status of 70 knees in 45 patients was followed retrospectively for at least 5 years, the mean being 7.9 (5-10.4) years. RESULTS: The average range of motion increased from 96 preoperatively to 118 at the lastest follow-up. In patients with rheumatoid arthritis, the average of 34 in the preoperative knee rating score and 23 in the function score improved to an average of 86 and 78, respectively. In the patient with osteoarthritis, the scores also improved from 41 and 39 to 88 and 84. Roentgenographic evaluation revealed a radiolucency rate of 36%. The total radiolucency score was 1.7. Reoperations were needed because of a deep infection that later developed in 2 cases, aseptic loosening in 2 cases and wear of polyethylene in 1 case. CONCLUSION: The mid-term results of P.F.C TKRA were reliable and good in that there was an increased range of motion, a restoration of function, relatively rare complications (5.8%) and the patients were well satisfied. However we consider that a long-term follow-up evaluation is needed in order to monitor changes in the rate of radiolucency.