Bone Biochemical Markers, Bone Mineral Density, and the Risk of Osteonecrosis of the Femoral Head: a Mendelian Randomization Study

Overview

Journal BMC Musculoskelet Disord

Publisher Biomed Central

Specialties Orthopedics
Physiology

Date 2024 Dec 5

PMID 39639283

Authors

Hai-Feng Jia

Ze-Ming Tian

Xue-Zhen Liang

Han-Zheng Li

Bo-Wen Lu

Jian Zhang

Gang Li

Affiliations

Soon will be listed here.

Abstract

Background: Alterations in bone metabolism may play a significant role in the early stages of femoral head necrosis, yet the causal relationship remains unclear. This study utilizes a two-sample Mendelian randomization (MR) approach to explore the genetic causal links between biochemical markers of bone metabolism, bone mineral density, and the risk of femoral head necrosis.

Methods: This study utilizes publicly available genome-wide association study (GWAS) datasets, with exposure factors including biochemical bone markers (25OHD, calcium, and alkaline phosphatase) and bone mineral density (measured at the lumbar spine, heel, femoral neck, and total body). The outcome of interest is osteonecrosis of the femoral head. We selected validated single nucleotide polymorphisms that are strongly associated with the exposure factors as instrumental variables. Mendelian randomization analysis was conducted using inverse variance weighting(IVW), MR-Egger regression, and weighted median estimation. Additionally, we performed analyses for horizontal pleiotropy, heterogeneity, and sensitivity.

Results: A total of 934 SNPs were included in this study. The MR analysis results indicate that the IVW analysis of 25OHD, Ca, and ALP did not reach statistical significance (25OHD OR = 1.006, 95%CI: 0.69-1.47, P = 0.975; Ca OR = 0.856, 95%CI: 0.43-1.70, P = 0.657; ALP OR = 1.022, 95%CI: 0.86-1.21, P = 0.801). However, bone density, including heel, lumbar spine, and total body bone density, showed a protective causal relationship with the onset of ONFH, while the results for femoral neck bone density did not reach statistical significance (lumbar spine BMD OR = 0.662, 95%CI: 0.48-0.91, P = 0.010; heel BMD OR = 0.726, 95%CI: 0.62-0.85, P < 0.001; total body BMD OR = 0.726, 95%CI: 0.62-0.85, P < 0.001; femoral neck BMD OR = 0.748, 95%CI: 0.53-1.05, P = 0.096). Cochran's Q statistic for IVW and MR-Egger methods indicated no intergenic heterogeneity for all exposure outcomes' SNPs, and the tests for pleiotropy suggested a low likelihood of pleiotropy in all causal analyses.

Conclusions: The results of this study indicate that there is no genetically mediated causal relationship between serum levels of 25-hydroxyvitamin D, calcium, and alkaline phosphatase and osteonecrosis of the femoral head. However, heel, lumbar spine, and total body bone mineral density can be considered protective factors for the occurrence of ONFH. There is no genetic causality between femoral neck bone mineral density and ONFH development.

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