Associations of dietary and serum magnesium with serum high-sensitivity C-reactive protein in early radiographic knee osteoarthritis patients

Abstract

Introduction: This study aimed to examine the associations of dietary magnesium (Mg) intake and serum Mg concentration with the high-sensitivity C-reactive protein (hsCRP) level in early radiographic knee osteoarthritis (OA) patients.

Methods: Multivariable logistic regression was used to test the associations of dietary and serum Mg with the serum hsCRP in early radiographic knee OA patients after adjustment of a number of potential confounding factors.

Results: A total of 936 early radiographic knee OA patients were included. A significant association between dietary Mg intake and hsCRP was observed. The multivariable-adjusted odds ratio (OR) (95% CI) for elevated hsCRP (≥3.0 mg/l) in the second, third, fourth, and fifth dietary Mg intake quintile were 0.44 (95% CI: 0.24–0.82), 0.58 (95% CI: 0.31–1.10), 0.34 (95% CI: 0.15–0.77), and 0.19 (95% CI: 0.06–0.57), respectively, compared with the lowest (first) quintile, and p for trend was 0.01. A significant association between serum Mg concentration and hsCRP was observed. The multivariable-adjusted OR (95% CI) for elevated hsCRP in the second, third, fourth, and fifth serum Mg concentration quintile were 0.63 (95% CI: 0.35–1.12), 0.83 (95% CI: 0.50–1.39), 0.53 (95% CI: 0.31–0.91), and 0.46 (95% CI: 0.25–0.85), respectively, compared with the lowest quintile, and p for trend was 0.01.

Conclusion: The present study indicated that both dietary and serum Mg were inversely associated with serum hsCRP in early radiographic knee OA patients.

Keywords:

• High-sensitivity C-reactive protein
• Magnesium
• Osteoarthritis

Conflict of interest

This work was supported by the Fundamental Research Funds for the Central Universities of Central South University (2015zzts112), Hunan Provincial Innovation Foundation for Postgraduate (CX2014A005), the National Natural Science Foundation of China (Nos. 81201420, 81272034, 81472130), the Provincial Science Foundation of Hunan (No. 14JJ3032), the Scientific Research Project of the Development and Reform Commission of Hunan Province ([2013]1199), the Scientific Research Project of Science and Technology Office of Hunan Province (2013SK2018), and the Doctoral Scientific Fund Project of the Ministry of Education of China (20120162110036). The authors declare that they have no conflict of interest.