Mid-term results of Oxford Phase 3 unicompartmental knee arthroplasty in obese patients

Objective: The aim of this study was to evaluate the mid-term outcomes of Oxford Phase 3 unicornpartmental knee arthroplasty (UKA) in obese patients in terms of prosthesis survival, progression of lateral compartment arthrosis and functional outcomes. Methods: The study included 67 patients, with a body mass index over 30, treated with mobile bearing Oxford Phase 3 UKA for isolated medial osteoarthritis between January 2005 and December 2010. Preoperative and postoperative knee range of motion (ROM) and knee scores (Hospital for Special Surgery, HSS and Oxford knee scores) were compared. Additionally, prostheses were evaluated using Oxford radiographic evaluation criteria at the final follow-up. Results: Mean age was 61 years and mean follow-up was 67.5 months. Insert dislocation occurred in 3 patients (4.5%). Postoperative knee ROM, HSS and Oxford knee scores were significantly improved (p<0.05). There was no sign of prosthesis failure or lateral compartment arthrosis in radiographic evaluation at the final follow-up. Conclusion: Oxford Phase 3 UKA with mobile bearing has good mid-term results in obese patients over 60 years of age.