LONG TERM EFFECTS OF VITAMIN D SUPPLEMENTATION AND MAINTAINING SUFFICIENT VITAMIN D ON KNEE OSTEOARTHRITIS OVER FIVE YEARS

Purpose: The aim of this study was to investigate the effect of vitamin D supplementation compared to placebo over two years on knee symptoms, psychological health, and inflammatory markers over five years in patients with knee osteoarthritis (OA). We also aimed to describe the effect of maintaining sufficient serum vitamin D levels on knee symptoms in knee OA patients over five years.