Comparison between the 2-peg Type and the Conventional Type of Oxford Unicompartmental Knee Arthroplasty: The Clinical and Radiological Results of Short-term Follow-up

ABSTRACT

PURPOSE: The purpose of this study was compared the clinical results, the range of motion and the radiologic evaluations of the classical type unicomparmental knee arthroplasty. MATERIALS AND METHODS: From February, 2007 to September, 50 patients who underwent minimal invasive unicompartmental knee arthroplasty for treating medial compartment osteoarthritis of the knee were enrolled. The conventional Oxford unicompartmental knee arthroplasty with a 1-peg design was performed in 26 patients, and these patients were 5 males and 21 females with a mean age of 65.1 (+/-6.9). New 2-peg design unicompartmental knee arthroplasty was performed in 24 patients and these patients were 5 males and 19 females with a mean age of 62.5 (+/-8.8). The clinical results, the range of motion and the radiologic results were compared between the preoperative period and postoperative 1 year. RESULTS: The clinical scores such as the International Knee Documentation Committee and Hospital for Special Surgery scores were improved from preoperative 61.7 and 63.6 to postoperative 74.0 and 80.3, respectively, but there were no significant differences between the 2 groups (p=0.313, p=0.763). The radiologic evaluations showed no significant differences. Yet the flexion/extension angle was significantly different between the groups, but this was within acceptable limits. CONCLUSION: On the short term follow up, the clinical result, range of motion and radiologic evaluation showed no significant difference between the new design (2-peg type) Oxford unicompartmental arthroplasty and the conventional kind. Both the conventional and 2-peg type unicompartmental arthroplasties can be useful treatments for medial compartment osteoarthritis.