D W Murray1, H Pandit, J S Weston-Simons, C Jenkins, H S Gill, A V Lombardi, C A F Dodd, K R Berend. 1. The Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Headington, Oxford, UK; The Nuffield Orthopaedic Centre, Headington, Oxford, UK. Electronic address: david.murray@ndorms.ox.ac.uk.
Abstract
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.
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.
Authors: Francesco Mancuso; Thomas W Hamilton; Vijay Kumar; David W Murray; Hemant Pandit Journal: Knee Surg Sports Traumatol Arthrosc Date: 2014-09-30 Impact factor: 4.342
Authors: Hasan Raza Mohammad; Stephen Mellon; Andrew Judge; Christopher Dodd; David Murray Journal: Knee Surg Sports Traumatol Arthrosc Date: 2021-04-17 Impact factor: 4.342
Authors: Andrew D Pearle; Jelle P van der List; Lily Lee; Thomas M Coon; Todd A Borus; Martin W Roche Journal: Knee Date: 2017-02-06 Impact factor: 2.199
Authors: Zhan Xia; Ming Han Lincoln Liow; Graham Seow-Hng Goh; Hwei Chi Chong; Ngai Nung Lo; Seng Jin Yeo Journal: Knee Surg Sports Traumatol Arthrosc Date: 2017-09-06 Impact factor: 4.342
Authors: J P van der List; H Chawla; J C Villa; H A Zuiderbaan; A D Pearle Journal: Knee Surg Sports Traumatol Arthrosc Date: 2015-11-26 Impact factor: 4.342
Authors: Hendrik A Zuiderbaan; Jelle P van der List; Saker Khamaisy; Danyal H Nawabi; Ran Thein; C Ishmael; Sophia Paul; Andrew D Pearle Journal: Knee Surg Sports Traumatol Arthrosc Date: 2015-11-21 Impact factor: 4.342