Abstract
Numerous studies have shown that vitamin D may play an important role in modulating the inflammatory process. This study aimed to evaluate the effect of vitamin D supplementation on inflammatory markers in patients with orthopedic disorders and obesity. Thirty-three obese subjects were included in the study and were divided into two groups based on their medical condition: acute orthopedic diseases and chronic orthopedic diseases. Inclusion criteria for the research included age 18-75 years, BMI > 30 kg/m(2), vitamin D deficiency, and no previous vitamin D supplementation. Samples were collected before and after 3 months of 4000 IU/day vitamin D supplementation. The study used enzyme-linked immunosorbent assay (ELISA) and measured serum levels of markers such as chitinase-3-like protein 1 (YKL-40), interleukin 6 (IL-6), interleukin 17 (IL-17), tumor necrosis factor (TNF-α), and adiponectin. After 3 months of vitamin D supplementation, a statistically significant increase in vitamin D and IL-17 levels was observed in the group with acute orthopedic diseases. Similarly, after supplementation, a statistically significant increase in vitamin D, IL-6 and TNF-α levels was observed in the group with chronic orthopedic diseases. Moreover, after vitamin D supplementation, statistically significantly higher adiponectin levels were observed in the chronic orthopedic group than in the acute orthopedic group. Despite high-dose vitamin D supplementation, inflammatory markers increased in acute and chronic orthopedic conditions. Based on our study, vitamin D does not reduce inflammation in patients with orthopedic conditions and obesity.