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Published in: BMC Musculoskeletal Disorders 1/2018

Open Access 01-12-2018 | Research article

Effect of high body mass index on knee muscle strength and function after anterior cruciate ligament reconstruction using hamstring tendon autografts

Authors: Wei-Hsiu Hsu, Chun-Hao Fan, Pei-An Yu, Chi-Lung Chen, Liang-Tseng Kuo, Robert Wen-Wei Hsu

Published in: BMC Musculoskeletal Disorders | Issue 1/2018

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Abstract

Background

Increased body mass index (BMI) has been associated with poorer function in patients who have undergone anterior cruciate ligament (ACL) reconstruction. However, the effect of high BMI on muscle strength in these patients remained unclear. The current study aimed to compare knee muscle strength and Knee injury and Osteoarthritis Outcome Score (KOOS) in ACL-reconstructed patients with a variety of different BMIs.

Methods

From November 2013 to March 2016, we prospectively enrolled 30 patients who underwent ACL reconstruction (18–60 years of age). Anthropometric parameters, body compositions, isokinetic muscle strength and KOOS were assessed preoperatively, and at post-operative 16th week and 28th week. The patients were stratified into two groups by BMI, i.e. normal BMI (18.5–24.9 kg/m2) and high BMI (≥25.0 kg/m2).

Results

Twelve patients in the normal BMI group completed the follow-up, while sixteen patients did so in the high BMI group. In comparison of muscle strength between baseline and 28th week follow-up, the normal BMI group had significant increases in overall knee muscle strength, while the high BMI group only had increases in extensors of uninjured knee and flexors of the injured knee. However, there were significant increases in all KOOS subscales for the high BMI group. The high BMI patients reported increased KOOS, which may reflect the contribution of ligament stability in the presence of inadequate muscle strength.

Conclusions

The normal BMI patients had improvement in all knee muscle strength following ACL reconstruction, while high BMI patients only had increases in certain knee muscles. High BMI patients had a decreased quadriceps muscle symmetry index, as compared to their normal BMI counterparts. Increases in quadriceps muscle strength of the uninjured knee and ACL reconstruction were associated with improvements in KOOS in high BMI patients.
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Metadata
Title
Effect of high body mass index on knee muscle strength and function after anterior cruciate ligament reconstruction using hamstring tendon autografts
Authors
Wei-Hsiu Hsu
Chun-Hao Fan
Pei-An Yu
Chi-Lung Chen
Liang-Tseng Kuo
Robert Wen-Wei Hsu
Publication date
01-12-2018
Publisher
BioMed Central
Published in
BMC Musculoskeletal Disorders / Issue 1/2018
Electronic ISSN: 1471-2474
DOI
https://doi.org/10.1186/s12891-018-2277-2

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