Research Of Preliminary Clinical Results Between PFC Sigma RPF And RP Prosthesises In Total Knee Arthroplasty

Objective:To compare the early clinical results between PFC Sigma RPF and PFC Sigma RP prosthesis in total knee arthroplasty.Methods:Randomly assign the patients from December 2009 to October 2010,who are first underwent total knee arthroplasty, into RPF group and RP group.There are 20 patients(20 knees) in RPF group,includes 3 males and 17 females.The average age of RPF group is 67.10±8.84. There are 16 patients(16 knees) inRPgroup,includes 2 males and 14 females.The average age of RP group is 67.56±7.68.Results:In RPF group, the preoperative ROM is 93.50°±12.37°,and the HSS score is 51.55±8.85. In RP group,the ROM is 94.69±13.23°,and HSS is 53.75±6.54.There are no significant differences in general data between two groups, so the clinical data of 2 groups have comparability. All incisions achieve healing. No complications of infection, DVT, pulmonary embolish, ankylosis, and prosthesis loosening occurred In RPF group, common peroneal nerve palsy occurred in 2 case. There are no significant differences in ROM between two groups at 2 weeks and 3 months after operation.At the final follow-up, the postoperative ROM was 124.00°±4.76°in RPF group, and was 117.81°±5.76°in RP group, showing significant differences,the postoperative HSS score was 92.90±1.17 in RPF group,and was 91.81±1.68in RP group, showing significant differences. In RPF group, the postoperative increase in ROM who had more than 100°was 21.87°±7.53°,and was 36.25±6.08°who had less than 100°showing significant differences. The ROM at 6 months in RPF group whose preoperative ROM less than 100°is more than that in RP group, showing significant differences. The same to preoperative ROM more than 100°. The postoperative increase in ROM in RPF group whose preoperative ROM was less than 100°is more than the RP group whose preoperative ROM was less than 100°, showing significant differences.There are no significant differences in postoperative increase ROM between 2 groups whose preoperative ROM was more than 100°. Conclusion:The postoperative ROM and HSS knee score by RPF prosthesis is superior to that by RP prosthesis. For RPF prosthesis, the patients who had less than 100°can get more postoperative increase in ROM than who had more than 100°.