Fig. 7

Analysis of triggering receptor expressed on myeloid cells (TREM)-2 immunoreactivity and macrophage density. Mean fluorescence intensity of TREM-2 (a) and number of macrophages (CD14⁺) (b) in the vitamin D-deficient (VDDef) (n = 5), vitamin D-sufficient (VDSuff) (n = 5), and vitamin D-supplemented (VDSupp) (n = 3) group infrapatellar fat, muscle, articular cartilage, tendon, ligament, menisci, suprapatellar fat, and synovial membrane. A comparative analysis was performed between the VDDef, VDSuff, and VDSupp groups. Data are shown as mean ± SD. *p < 0.05, **p < 0.01