Effects of Bisphosphonates on Bone of Osteoporotic Men With Different Androgen Levels: A Case-Control Study

Osteoporosis in men has been neglected despite its association with disability and mortality. We evaluated the effect of bisphosphonates (BPs) on bone mineral density (BMD) and bone turnover biomarkers of osteoporotic men with different androgen levels.This case-control study included 136 osteoporotic men who were divided into normal group (n = 75) and hypogonadism group (n = 61) (patients treated with testosterone were excluded) according to their serum testosterone levels (cutoff value, 350 ng/dL). BMD, serum testosterone, total alkaline phosphatase, and cross-linked C-telopeptide of type I collagen were detected. The relationship between testosterone levels and BMD at baseline was evaluated. All patients were treated with BPs for 2 years. We compared the effects of BPs on BMD and bone turnover biomarkers between the 2 groups.At baseline, there were no significant differences in BMD and bone turnover biomarkers between the 2 groups. Testosterone levels were positively correlated with BMD in the hypogonadism group. After treatment, the lumbar BMD increased by 7.65% ± 1.54% and 7.47% ± 1.88% in normal and hypogonadism groups, respectively (both P < .01 vs baseline) and hip BMD increased without significant differences between the 2 groups. Serum cross-linked C-telopeptide of type I collagen and alkaline phosphatase levels decreased without significant differences between the 2 groups (all P < .01 vs baseline).Testosterone level is positively correlated with BMD in men with hypogonadism. In osteoporotic men, BPs significantly increase spine and hip BMD and decrease bone resorption. The efficacy of BPs is similar in men with or without hypogonadism.