Body Mass Index Did Not Affect the Risk of Revision 3-9 Years After Total Knee Replacement Surgery

Jan Rune Mikaelsen, MD; Rune Bruhn Jakobsen, MD, PhD; Jan Harald Røtterud, MD, PhD; Per-Henrik Randsborg, MD, PhD

Arthroplasty Today (Jun 2024)

Body Mass Index Did Not Affect the Risk of Revision 3-9 Years After Total Knee Replacement Surgery

Jan Rune Mikaelsen, MD,
Rune Bruhn Jakobsen, MD, PhD,
Jan Harald Røtterud, MD, PhD,
Per-Henrik Randsborg, MD, PhD

Affiliations

Jan Rune Mikaelsen, MD: Department of Orthopaedic Surgery, Akershus University Hospital, Lørenskog, Norway; Faculty of Medicine, Institute of Clinical Medicine, Campus Ahus, University of Oslo, Lørenskog, Norway; Corresponding author. Department of Orthopaedic Surgery, Akershus University Hospital, Postboks 1000, 1478 Lørenskog, Norway. Tel.: +1 479 849 3257.
Rune Bruhn Jakobsen, MD, PhD: Department of Orthopaedic Surgery, Akershus University Hospital, Lørenskog, Norway; Faculty of Medicine, Institute of Health and Society, University of Oslo, Oslo, Norway
Jan Harald Røtterud, MD, PhD: Department of Orthopaedic Surgery, Akershus University Hospital, Lørenskog, Norway
Per-Henrik Randsborg, MD, PhD: Department of Orthopaedic Surgery, Akershus University Hospital, Lørenskog, Norway; Faculty of Medicine, Institute of Clinical Medicine, Campus Ahus, University of Oslo, Lørenskog, Norway

Journal volume & issue: Vol. 27
p. 101376

Abstract

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Background: There are conflicting reports in the literature regarding the risk of revision after primary total knee replacement (TKR) in obese patients. The purpose of this study was to investigate if body mass index (BMI) influences the risk of revision 3-9 years after primary TKR. Methods: All patients undergoing a primary TKR in our institution from 2014 to 2018 were included in a retrospective study. The effect of BMI on all-cause revision was estimated in a logistic regression analysis. A directed acyclic graph was created to identify variables affecting the primary endpoint (revision). According to the directed acyclic graph, adjustment was only needed for age and smoking. However, we also included variables thought to influence the revision risk based on clinical experience and previous research. The final logistic regression analysis was therefore adjusted for age, sex, smoking status, diabetes mellitus and the American Society of Anesthesiologists classification. Results: One thousand fifty-nine primary TKR patients with a mean age of 68.1 (standard deviation 9.4) years were included. There were 609 (57.5%) women, and the median follow-up time was 5.6 (range 3.0-9.0) years. There were 41 (3.9%) revisions. BMI did not affect the risk of revision when adjusted for relevant covariates in a multivariate logistic regression analysis (odds ratio 0.99, 95% confidence interval 0.93-1.05, P = .6). Conclusions: BMI did not influence the risk of revision rate 3-9 years after TKR.

Published in Arthroplasty Today

ISSN: 2352-3441 (Online)
Publisher: Elsevier
Country of publisher: United States
LCC subjects: Medicine: Surgery: Orthopedic surgery
Website: https://www.journals.elsevier.com/arthroplasty-today/

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