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Effect of alendronate treatment on bone mineral density in male patients with osteoporosis.

OBJECTIVE
To assess the efficacy of alendronate therapy on bone mineral density (BMD) at the lumbar spine and hip in men with osteoporosis.


METHODS
Medical records of male patients with osteoporosis, who had undergone follow-up in the Endocrinology Clinic at the National Naval Medical Center, were reviewed, and nine patients treated with alendronate for at least 1 year were identified. Patients were excluded from analysis if they had evidence of osteomalacia or if baseline and follow-up BMD results on the same dual-energy x-ray absorptiometry (DEXA) densitometer, at least 10 months apart, were not available. DEXA BMD results at the lumbar spine and hip, before and after at least 10 months of alendronate treatment, were analyzed for significant differences. Patients were also receiving calcium supplementation (1,000 to 1,500 mg/day), and all but one patient received vitamin D (400 to 800 U/day).


RESULTS
Lumbar spine BMD increased by 6.4 +/- 1.8% per year with alendronate treatment (P = 0.008). A mean absolute gain of 0.052 +/- 0.010 g/cm 2 (P = 0.005) in lumbar spine BMD was noted for the entire study group (N = 9), after a mean duration of treatment of 14 +/- 1 months. The mean lumbar spine BMD Z score improved by 0.40 +/- 0.09 (P = 0.002) with alendronate therapy. The femoral neck BMD also increased by 4.5 +/- 1.4% per year with alendronate treatment (P = 0.013). The mean absolute gain in femoral neck BMD was 0.028 +/- 0.009 g/cm 2 (P = 0.013) for the study group (N = 9) after 14 +/- 1 months of therapy. The mean femoral neck BMD Z score improved 0.30 +/- 0.08 (P = 0.005) with treatment. BMD gains at the greater trochanter of 3.2 +/- 1.5% per year (P = 0.067) and at Ward's triangle of 9.1 +/- 4.2% per year (P = 0.061) were not statistically significant. Two patients discontinued alendronate treatment after 1 year because of epigastric or retrosternal pain.


CONCLUSION
Oral alendronate treatment, given in combination with calcium supplementation and physiologic doses of vitamin D, resulted in significant improvements in lumbar spine and femoral neck BMD after a 14-month period in this small group of men with osteoporosis. Although controlled, prospective trials involving larger numbers of male patients with fracture incidence data are needed before definitive conclusions can be made, alendronate treatment seems to be effective in improving BMD in men with osteoporosis, similar to its efficacy in women.