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Published in: European Journal of Medical Research 1/2023

Open Access 01-12-2023 | Osteoarthrosis | Research

Causal relationship between sarcopenia and osteoarthritis: a bi-directional two-sample mendelian randomized study

Authors: Jiyong Yang, Peng Liu, Shuai Wang, Tao Jiang, Yilong Zhang, Wengang Liu

Published in: European Journal of Medical Research | Issue 1/2023

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Abstract

Background

Previous studies have shown that osteoarthritis (OA) and sarcopenia (SP) are closely related to each other, but the causal relationships between them have not been established. The aim of this study was to investigate the causal associations between OA and SP via a bi-directional Mendelian randomization (MR) approach.

Methods

A bi-directional two-sample MR was adopted to research the causal relationship between SP and OA. The instrumental variables for SP and four types of OA: KOA, HOA, total knee replacement (TKR) and total hip replacement (THR) were derived from published large genome-wide association studies (GWAS). The inverse variance weighted (IVW), MR-Egger and weighted median estimator (WME) methods were used to estimate bi-directional causal effects.

Results

Low grip strength (GS) did not have a causal effect on four types of OA (KOA: OR = 1.205, 95% CI 0.837–1.734, p = 0.316; HOA: OR = 1.090, 95% CI 0.924–1.609, p = 0.307; TKR: OR = 1.190, 95% CI 1.084–1.307, p = 0.058; THR: OR = 1.035, 95% CI 0.792–1.353, p = 0.798), while appendicular lean mass (ALM) had a causal effect on four types of OA (KOA: OR = 1.104, 95% CI 1.041–1.171, p = 0.001; HOA: OR = 1.151, 95% CI 1.071–1.237, p < 0.001; TKR: OR = 1.114, 95% CI 1.007–1.232, p < 0.001; THR: OR = 1.203, 95% CI 1.099–1.316, p < 0.001). In the reverse direction, KOA or HOA did not have a significant causal effect on both GS and ALM (KOA-GS: OR = 1.077, 95% CI 0.886–1.309, p = 0.458; KOA-ALM: Beta = 0.004, p = 0.892; HOA-GS: OR = 1.038, 95% CI 0.981–1.099, p = 0.209; HOA-ALM: Beta = − 0.017, p = 0.196; TKR-GS: OR = 0.999, 95% CI 0.739–1.351, p = 0.997; TKR-ALM: Beta = 0.018, p = 0.501; THR-GS: OR = 1.037, 95% CI 0.978–1.101, p = 0.222; THR-ALM: Beta = − 0.023, p = 0.081).

Conclusions

The present study suggests that SP may have a causal effect on OA through changes in muscle composition rather than muscle strength, while little evidence was provided for the causal effect of OA on SP.
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Metadata
Title
Causal relationship between sarcopenia and osteoarthritis: a bi-directional two-sample mendelian randomized study
Authors
Jiyong Yang
Peng Liu
Shuai Wang
Tao Jiang
Yilong Zhang
Wengang Liu
Publication date
01-12-2023

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