Does Obesity Influence Clinical Outcomes at Nine Years Following Total Knee Arthroplasty

Rachel Collins, Phil Walmsley, Anish Amin, Ivan Brenkel, Robert Clayton

Research output: Contribution to conferencePaperpeer-review


A total of 445 consecutive primary total knee replacements (TKRs) were followed up prospectively at six and 18 months and three, six and nine years. Patients were divided into two groups: non-obese (body mass index (BMI) < 30 kg/m2) and obese (BMI ≥ 30 kg/m2). The obese group was subdivided into mildly obese (BMI 30 to 35 kg/m2) and highly obese (BMI ≥ 35 kg/m2) in order to determine the effects of increasing obesity on outcome. The clinical data analysed included the Knee Society score, peri-operative complications and implant survival. There was no difference in the overall complication rates or implant survival between the two groups. Obesity appears to have a small but significant adverse effect on clinical outcome, with highly obese patients showing lower function scores than non-obese patients. However, significant improvements in outcome are sustained in all groups nine years after TKR. Given the substantial, sustainable relief of symptoms after TKR and the low peri-operative complication and revision rates in these two groups, we have found no reason to limit access to TKR in obese patients
Original languageEnglish
Publication statusPublished - 21 Mar 2013
EventAmerican Academy of Orthopaedic Surgeons: Annual Meeting 2013 - Conference Centre, McCormick Place, Chicago, United States
Duration: 19 Mar 201323 Mar 2013


ConferenceAmerican Academy of Orthopaedic Surgeons
Country/TerritoryUnited States


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