TNFRSF11B and osteoporosis: When the bone histomorphometric and BTM results were compared, there was a significant correlation between BFR/BS and PINP (r = 0.95, p = 0.001), OPG (r = 0.77, p = 0.044), and TRAP5b (r = 0.77, p = 0.044) for the CKD5D group, while MAR correlated significantly with OPG (r = 0.78, p = 0.039) for the osteoporosis group.