Age (r = 0.454, p < 0.001), CRP (r = 0.481, p < 0.001), ESR (r = 0.479, p < 0.001), CCP (r = 0.409, p < 0.001), synovitis score on GSUS (r = 0.514, p < 0.001), synovitis score on PDUS (r = 0.574, p < 0.001), tenosynovitis score on GSUS (r = 0.597, p < 0.001), and tenosynovitis score on PDUS (r = 0.503, p < 0.001) were moderately correlated with osteoporosis in RA patients. Here, CRP is linked to tenosynovitis.