Obesity has no adverse effect on the outcome of unicompartmental knee replacement at a minimum follow-up of seven years
- 1 August 2013
- journal article
- Published by British Editorial Society of Bone & Joint Surgery in The Bone & Joint Journal
- Vol. 95-B (8), 1064-1068
- https://doi.org/10.1302/0301-620x.95b8.31370
Abstract
The significance of weight in the indications for unicompartmental knee replacement (UKR) is unclear. Our hypothesis was that weight does not affect the long-term rate of survival of UKRs.We undertook a retrospective study of 212 UKRs at a mean follow-up of 12 years (7 to 22). The patients were distributed according to body mass index (BMI; < vs ≥ 30 kg/m2) and weight (< vs ≥ 82 kg). Kaplan-Meier survivorship analysis was performed and ten-year survival rates were compared between the sub-groups. Multimodal regression analysis determined the impact of the various theoretical contraindications on the long-term rate of survival of UKR.The ten-year rates of survival were similar in the two weight subgroups (≥ 82 kg: 93.5% (95% confidence interval (CI) 66.5 to 96.3); < 82 kg: 92.5% (95% CI 82.5 to 94.1)) and also in the two BMI subgroups (≥ 30 kg/m2: 92% (95% CI 82.5 to 95.3); < 30 kg/m2: 94% (95% CI 78.4 to 95.9)). Multimodal regression analysis revealed that weight plays a part in reducing the risk of revision with a relative risk of 0.387, although this did not reach statistical significance (p = 0.662). The results relating weight and BMI to the clinical outcome were not statistically significant. Thus, this study confirms that weight does not influence the long-term rate of survival of UKR.Cite this article: Bone Joint J 2013;95-B:1064–8.Keywords
This publication has 29 references indexed in Scilit:
- Unicompartmental Versus Total Knee Arthroplasty Database Analysis: Is There a Winner?Clinical Orthopaedics and Related Research, 2012
- Relative Risk of Different Operations for Medial Compartment Osteoarthritis of the KneeOrthopedics, 2011
- Minimally invasive Oxford phase 3 unicompartmental knee replacement RESULTS OF 1000 CASESMaterials, 2011
- The effect of obesity on the outcome of hip and knee arthroplastyInternational Orthopaedics, 2010
- Factors associated with reduced early survival in the Oxford phase III medial unicompartment knee replacementThe Knee, 2010
- The impact of obesity on the mid-term outcome of cementless total knee replacementThe Journal of Bone and Joint Surgery. British volume, 2009
- Results of Unicompartmental Knee Arthroplasty at a Minimum of Ten Years of Follow-upThe Journal of Bone & Joint Surgery, 2005
- Roentgenographic and Clinical Findings of Patellofemoral OsteoarthrosisClinical Orthopaedics and Related Research, 1990
- Rationale, of The Knee Society Clinical Rating SystemClinical Orthopaedics and Related Research, 1989
- Nonparametric Estimation from Incomplete ObservationsJournal of the American Statistical Association, 1958