The Effects Of Inherent Inaccuracies In DXA In Vivo BMD Measurements On Osteopenic/Osteoporotic Diagnostics/Prognositics
Funder
National Health and Medical Research Council
Funding Amount
$411,980.00
Summary
Osteoporosis (porous bone) and consequent associated bone fractures of mainly post-menopausal women and the elderly of both genders constitutes a significant, widespread and rapidly growing public health problem. It is already a major health-cost burden in Australia and worldwide and is set to increase dramatically over the next few decades as the proportion of the population at or above the osteoporosis-prone age increases sharply. Current diagnostic evaluations of osteoporosis, bone mineral st ....Osteoporosis (porous bone) and consequent associated bone fractures of mainly post-menopausal women and the elderly of both genders constitutes a significant, widespread and rapidly growing public health problem. It is already a major health-cost burden in Australia and worldwide and is set to increase dramatically over the next few decades as the proportion of the population at or above the osteoporosis-prone age increases sharply. Current diagnostic evaluations of osteoporosis, bone mineral status of the skeleton, mechanical integrity of bone, and bone fracture risk are mainly based on X-ray absorption measurements of a given individual's bone mineral density (BMD) using Dual-energy X-ray Absorptiometric (DXA) bone densitometer instrumentation. New drugs to retard, ameliorate, or reverse the low bone mineral density condition of osteoporosis are now becoming available, but cannot be prescribed unless sufficiently low BMD is demonstrated for a given patient. The efficacy of these drugs is usually held to be greatest at the earliest stage of osteoporosis (osteopenia) and their effectiveness evaluated on the basis of DXA-measured bone mineral density. The Chief Investigator of this project has already shown by published quantitative analysis and simulation studies that such BMD measurements are inherently inaccurate; that errors of 20% and greater can readily pertain, particularly for those patients at the early stages of osteoporosis and those at or above the osteoporosis-prone age -- the very individuals for whom bone mineral density values are often of paramount interest and concern. These systematic DXA inaccuracies can be large enough to either mask the presence of osteoporosis or lead to false diagnoses and patient monitoring results. The present project, for the first time anywhere, is desiged to quantitatively establish the extent of these inaccuracies using actual DXA densitometers utilizing sophisitcated and precise methods.Read moreRead less
The Central Role Of The Osteocyte In Skeletal Pathophysiology
Funder
National Health and Medical Research Council
Funding Amount
$638,517.00
Summary
Bone diseases affect more people than any other group, carry a huge and growing socioeconomic cost, yet their aetiologies are not fully determined. This study will elucidate the role of the resident bone cell, the osteocyte, in prevalent bone diseases such as osteoporosis, osteoarthritis and related orthopaedic conditions, rheumatoid arthritis, bone cancer, and in systemic metabolism. The goal is to provide the knowledge and mechanisms for developing improved treatments and patient outcomes.
Identifying Novel Susceptibility Loci For Osteoporosis Through Whole Genome Sequencing
Funder
National Health and Medical Research Council
Funding Amount
$623,969.00
Summary
Our highly successful genome-wide studies of bone mineral density (a risk factor for osteoporosis) have highlighted 60 loci relevant to the disease. However, a substantial amount of genetic variance remains unexplained. This project will focus on less common variants that have larger effect sizes and are relevant to osteoporosis, but are not well studied by approaches such as high-density SNP arrays and genome-wide association studies.
Investigating The Psychosocial And Socioeconomic Predictors Of Osteoporosis
Funder
National Health and Medical Research Council
Funding Amount
$302,123.00
Summary
Osteoporosis is ranked the 7th national health priority, in recognition of the enormous impact on quality of life and greater risk of mortality following osteoporotic fracture. With few exceptions, socially disadvantaged individuals tend to have poorer health outcomes. However, little is known of psychosocial and socioeconomic determinants of osteoporosis, and barriers to preventive healthcare. This project will inform future health promotion messages targeted toward those most at risk.
Osteoporosis is the commonest metabolic bone disease worldwide, and costs Australia >1% of GDP. It is a strongly inherited disease. We recently completed a genome-wide association study in 2000 postmenopausal women with either very high or very low bone density, and identified many genes contributing to BMD. The current study aims to use next-generation sequencing to study these women in greater genetic depth, aiming to identify more clearly the exact genetic determinants of bone mass.