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The effects of alcoholic liver cirrhosis on the calcium, calciotropic hormones (parathyroid hormone and 25 hydroxy vitamin D) and testosterone were examined in twenty men. A transiliac bone biopsy was performed in each patient. A double tetracycline labeling was done in 17 patients. Radiological signs of osteoporosis (crushed vertebrae and rib fractures) were rarely observed but a low trabecular bone volume (BV/TV) was consistently encountered (BV/TV = 14.2 +/- 4.6; normal 18.8 +/- 4.8; p less than .001). Osteomalacic signs were never observed in spite of very low calcium and 25 hydroxy vitamin D levels in the blood. Increased osteoclastic eroded surfaces (ES/BS = 8.1 +/- 5.2; normal 3.7 +/- 1.1; p less than .001) were not related with an hyperparathyroidism but a significant correlation was found with testosterone levels (r = .45; p less than .05). Histodynamic measurements indicate a drastically decreased osteoblastic activity with a very low bone formation rate (BFR/BS = .009 +/- .001; normal .0175 +/- .0125; p less than .001). This could explain the net increase of eroded surfaces and that osteomalacia cannot be observed even in the presence of profound calcium and vitamin D changes in alcoholics.
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G Riffat
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