Bone Abstracts

Objective: Evidence for further reduction of nonvertebral fracture (NVFX) beyond 3 years of antiresorptive therapy is limited. Since long-term denosumab (DMAb) treatment is associated with continuous increases in BMD and sustained fracture reduction, we analyzed the influence of femoral neck (FN) BMD after 3 years on NVFX rates.Methods: Long-term subjects received 7 continuous years of DMAb; cross-over subjects received 3 years of placebo (FREEDOM) and 4...

see PP360....

Objective: To identify predictors of inadequate response to oral bisphosphonate therapy, defined as the incidence of ≧2 fractures while on treatment among incident oral bisphosphonate users with high refill compliance (≧80%).Material and methods: Data from computerized records and pharmacy invoices were obtained from SIDIAP (Catalonia, E) and Danish Health Registries (DK) for all incident users of oral bisphosphonates in 2006–2007 and 2000&#15...

Objective: To evaluate musculoskeletal development using pQCT in children with coeliac disease (CD) on gluten free diet (GFD) compared with age and gender matched healthy controlsMethod: 38 children (18 males) with CD on GFD for a duration of 3.6 years (0.6, 12.5) underwent pQCT at 4%, 38 and 66% tibial sites. Bloods were collected in CD children only. Results reported as median (range).Result: Median TTG was 1.8 IU/l (0.1, 114) wi...

Osteosarcoma is the most common primary bone-derived tumor. However, the pathogenic molecular mechanism(s) underpinning osteosarcoma development and metastasis remain elusive. The polycystins PC1 (polycystin-1; encoded by PKD1) and PC2 (polycystin-2) are central players in mechanotransduction, a process that can influence all steps of the invasion/metastasis cascade. Recent studies from our laboratory provided, for the first time, a direct link between mechanosensing polycysti...

Background: Osteocalcin has an important role in bone metabolism. Uncarboxylated osteocalcin predicts risk for hip fracture and lower bone mineral density (BMD). Warfarin inhibits carboxylation of osteocalcin, providing a mechanistic link between warfarin and impaired bone metabolism. Studies examining the relationship between warfarin use and BMD have been inconsistent. The goal of this study was to further characterize this relationship.Population: CaM...

Objectives: The determinants of areal bone mineral density (aBMD) and hip geometry estimates in adolescent athletes are poorly understood. This study aimed to identify the determinants of aBMD and hip geometry estimates in adolescent male athletes.Methods: One hundred twenty one males (13.1±0.1 years) were measured: 41 swimmers, 37 footballers, 29 cyclists and 14 controls. Dual energy X-ray absorptiometry (DXA) measured aBMD at lumbar spine, femoral...

Although Vitamin D deficiency is the most common form of rickets worldwide, when there is a failure to respond to cholecalciferol, inborn errors of vitamin D metabolism should be considered. We describe two unrelated individuals who presented with early onset rickets characterised by reduced serum levels of 25(OH)D and 1,25(OH)2D, and a deficient response to Vitamin D2/D3 and calcitriol. Case 1: A Caucasian Australian girl with non-consanguineous parents ...

Objective: Autism Spectrum Disorder (ASD) is associated with lower bone mass in children. Physical activity and nutrition influence bone pathophysiology, and differences in these lifestyle factors are observed between children with vs. without ASD; however, whether these factors contribute to bone differences is unknown. We examined if: 1) differences existed in bone mineral density (BMD), content (BMC), or bone geometry in boys with vs without ASD and 2) whether physical acti...

Periostin is a matricellular protein expressed in late osteoblasts/osteocytes, which levels increase in response to PTH and mechanical loading. In turn periostin contributes to modeling based bone formation while restraining bone remodeling. Periostin is also a substrate of cathepsin K and inhibition of periostin blunts the effects of cathepsin K inhibition on bone. Considering the important role of osteocytes and their cathepsin K expression on osteolysis during lactation, we...