Elsevier

Bone

Volume 6, Issue 4, 1985, Pages 211-220
Bone

Original article
Metabolic bone disease with and without osteomalacia after intestinal bypass surgery: A bone histomorphometric study

https://doi.org/10.1016/8756-3282(85)90003-1Get rights and content

Abstract

We performed iliac bone histomorphometry after in vivo double tetracycline labeling 3–14 years after intestinal bypass surgery for obesity in 21 patients, selected because of clinical suspicion of metabolic bone disease, and compared the results with those of 40 age-matched normal control subjects. Osteomalacia defined by rigorous kinetic criteria was found in six cases, histologic features of secondary hyperparathyroidism without significantly impaired mineralization in one case, and possible Osteomalacia masked by impaired matrix synthesis in one case. In the patients with definite Osteomalacia, nonfracture bone pain was more frequent, corrected plasma calcium lower, plasma alkaline phosphatase and magnesium higher, and secondary hyperparathyroidism more severe than in the other patients. In the patients without Osteomalacia there was a 24.5% reduction in trabecular bone volume compared to the controls; in contrast to age-related bone loss and post-menopausal osteoporosis, this was due mainly to reduction in the thickness rather than the density of trabecular plates. About two-thirds of the reduction in trabecular thickness was due to reduction in interstitial bone thickness, representing the cumulative effect of increased depth of osteoclastic resorption cavities, probably due in part to secondary hyperparathyroidism. About one-third of the reduction in trabecular thickness was the result of reduced mean wall thickness, representing insufficient osteoblastic matrix synthesis, probably due in part to malabsorption of an unidentified nutrient necessary for normal bone health. Resorption indices were not increased at the time of the biopsy, but there were persistent defects in the recruitment and activity of osteoblasts. Clinically significant bone loss after intestinal shunt surgery, as in several other clinical situations, results from the combined effects of an unsustained increase in bone resorption and a sustained decrease in bone formation.

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