The effect of bone morphogenetic protein-7 (OP-1) and demineralized bone matrix (DBM) in the rabbit tibial distraction model.

OP-1 (800 microg) or DBM (1900 mg) were implanted in a rabbit tibial distraction model, and healing was compared to a non treated control group. The limbs were harvested after ten weeks and examined using radiography, computerized axial tomography and histological analysis. Neither of the treatments showed a changed healing pattern.

Histomorphometry and micro-computed tomography of bone augmentation under a titanium membrane.

Objectives: Bone augmentation underneath an occlusive titanium membrane is evaluated in most cases by means of serial histological sections and histomorphometry. Micro-computed tomography (micro-CT) is a less invasive and dynamic technique to measure bone volume in animals of a size that fits into the gantry. The aim of the present study was to evaluate whether the latter approach could match histomorphometry to assess bone augmentation under a titanium membrane.

Identifying postmenopausal women with osteoporosis by calcaneal ultrasound, metacarpal digital X-ray radiogrammetry and phalangeal radiographic absorptiometry: a comparative study.

Identifying women with osteoporosis remains a clinical challenge, as it may not be feasible or cost-effective to recommend dual-energy X-ray absorptiometry (DXA) for all postmenopausal women. In this regard, quantitative ultrasound (QUS) has emerged as an attractive screening tool because of the (relatively) low cost and because QUS and DXA-assessed BMD appear to be equally predictive of future (hip) fracture risk. The objective of this study was to compare the ability of calcaneal QUS to identify osteoporosis with two alternative potential screening methods: digital X-ray radiogrammetry (DXR) and radiographic absorptiometry (RA).

Factors determining the final outcome of treatment of idiopathic scoliosis with the Boston brace: a longitudinal study.

This study tries to determine factors influencing the final outcome of treatment of idiopathic scoliosis with the Boston brace and to compare the results with the natural history. One hundred and fifty-one patients, 130 girls and 21 boys, treated between 1982 and 1991, were reviewed. A series of continuous and categorical variables were measured, allowing for the construction of a multiple regression equation.

The Impact of congenital, severe, untreated growth hormone (GH) deficiency on bone size and density in young adults: insights from genetic GH-releasing hormone receptor deficiency.

GH and IGF-I have well recognized effects on bone elongation during development, but their importance for bone mineralization and structure during the growth phase are less well understood. Because children with GH deficiency are generally treated with GH, little detailed information exists in humans about the effects of long-term GH deficiency on bone development. The recently described syndrome of genetic GHRH receptor deficiency in Pakistan (dwarfism of Sindh) affords a unique opportunity to examine the question of GH deficiency on bone development because the affected patients have congenital, severe, isolated GH deficiency, which had never been treated because of societal reasons.