Pamidronate does not adversely affect bone intrinsic material properties in children with osteogenesis imperfecta

Bone
Markus WeberKlaus Klaushofer

Abstract

Cyclical intravenous pamidronate therapy increases bone mass in children with osteogenesis imperfecta (OI), but the effect on the intrinsic material properties of bone is unknown at present. Thus, a possible influence of pamidronate treatment on bone quality at the material level might negate the beneficial effects of the gain in bone mass and lead to bone fragility in the long term. In the present study, we used transiliac bone biopsy samples and assessed the intrinsic material properties of the bone tissue at the micron-level by combined backscattered electron imaging and nanoindentation. Paired iliac bone samples from 14 patients (age 3 to 17 years) with severe OI before and after 2.5 +/- 0.5 years (mean +/- SD) of pamidronate treatment as well as age-matched controls were examined. Bone histomorphometry was performed in all samples and confirmed an increase of bone mass in treated patients. Backscattered electron imaging was used to measure the weighted mean calcium content (Ca(Mean)), the most frequent calcium content (Ca(Peak)), the variation in mineralization (Ca(Width)) and the amount of lowly mineralized areas (Ca(Low)) that correspond to sites of primary mineralization. Nanoindentation was performed in a subgroup of 6...Continue Reading

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