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BACKGROUND: Obesity is considered to be a contraindication for unicompartmental knee replacement (UKR). The aim was to study the impact of BMI on failure rate and clinical outcome of the Oxford mobile bearing UKR. METHOD: Two thousand four hundred and thirty-eight medial Oxford UKRs were studied prospectively and divided into groups: BMI<25 (n=378), BMI 25 to <30 (n=856), BMI 30 to <35 (n=712), BMI 35 to <40 (n=286), and BMI 40 to <45 (n=126) and BMI≥45 (n=80). RESULTS: There was no significant difference in survival rate between groups. At a mean follow-up of 5years (range 1-12years) there was no significant difference in the Objective American Knee Society Score between groups. There was a significant (p<0.01) trend with the Oxford Knee Score (OKS) and Functional American Knee Society Scores decreasing with increasing BMI. As there was an opposite trend (p<0.01) in pre-operative OKS, the change in OKS increased with increasing BMI (p=0.048). The mean age at surgery was significantly (p<0.01) lower in patients with higher BMI. CONCLUSIONS: Increasing BMI was not associated with an increasing failure rate. It was also not associated with a decreasing benefit from the operation. Therefore, a high BMI should not be considered a contra-indication to mobile bearing UKR. LEVEL OF EVIDENCE: IV.

Original publication




Journal article



Publication Date





461 - 465


Obesity, Outcomes, Unicompartmental knee replacement, Adult, Aged, Arthroplasty, Replacement, Knee, Body Mass Index, Cohort Studies, Databases, Factual, Female, Follow-Up Studies, Humans, Knee Prosthesis, Male, Middle Aged, Minimally Invasive Surgical Procedures, Obesity, Prosthesis Design, Prosthesis Failure, Recovery of Function, Retrospective Studies, Risk Assessment, Treatment Outcome