Difference in utilization rate of UKA by different selection criteria in Asian population - A retrospective review

Abstract

Introduction: Unicompartmental knee arthroplasty has become a standard surgical treatment for isolated medial compartment osteoarthritis since its establishment 40 years ago. Yet the orthopaedic community has yet to reach a consensus on the patient selection criteria. Methodology: This is a retrospective review of all primary TKAs and UKAs in a teaching hospital in 2 year period. Preoperative Knee X-Ray films and various clinical parameters [ body weight, age, range of movement, deformity, PFJ status ] were analysed. Commonly used criteria [ Classical Kozinn & Scott, Oxford ] are applied to assess the feasibility of patient as a UKA candidate. Results and Analysis: A total of 652 TKAs and UKAs from 620 patients were analysed. Patient with inflammatory arthritis or valgus knee deformity were excluded. 44% of knee meet Oxford Criteria for mobile bearing UKA and only 8% meet classical Kozinn & Scott criteria. Discussion and Conclusion: This is the largest study on Asian population to analyse the utilization of UKA by different criteria, with result concur with most literatures that strict K&S criteria leads to low utilization of UKAs. More long term data is needed to analyse the outcome of various subgroup to determine the most suitable criteria for Asian population.