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https://www.readbyqxmd.com/read/28108802/opportunistic-screening-for-osteoporosis-by-routine-ct-in-southern-europe
#1
Elena Alacreu, David Moratal, Estanislao Arana
: Feasibility evaluation of early detection of osteoporosis in oncologic patients by bone mineral density (BMD) on abdominal computed tomography (CT) scans performed for other clinical indications, by using dual-energy X-ray absorptiometry (DXA) as reference. Abdominal CT images can identify patients with osteoporosis BMD without additional radiation exposure or cost. INTRODUCTION: The purpose of the study is to evaluate the feasibility of early detection of osteoporosis by bone mineral density (BMD) on abdominal computed tomography (CT) scans performed in oncologic patients, comparing calibrated and uncalibrated measurements by using dual-energy X-ray absorptiometry (DXA) as reference...
January 20, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/28105580/pixel-based-dxa-derived-structural-properties-strongly-correlate-with-pqct-measures-at-the-one-third-distal-femur-site
#2
Alexander M Baker, David W Wagner, B Jenny Kiratli, Gary S Beaupre
While bone mineral density has been traditionally used to quantify fracture risk for individuals with spinal cord injuries, recent studies are including engineering measurements such as section modulus and cross sectional moment of inertia. These are almost exclusively calculated by peripheral QCT scanners which, unlike DXA scanners, are rarely found in clinical settings. Using fifty-four fresh frozen femora, we developed and validated a pixel-by-pixel method to calculate engineering properties at the distal femur using a Hologic QDR-1000 W DXA scanner and compared them against similar parameters measured using a Stratec XCT-3000 peripheral QCT scanner...
January 19, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28099754/addressing-the-crisis-in-the-treatment-of-osteoporosis-a-path-forward
#3
Sundeep Khosla, Jane A Cauley, Juliet Compston, Douglas P Kiel, Clifford Rosen, Kenneth G Saag, Elizabeth Shane
Considerable data and media attention have highlighted a potential "crisis" in the treatment of osteoporosis. Specifically, despite the availability of several effective drugs to prevent fractures, many patients who need pharmacological therapy are either not being prescribed these medications or if prescribed a medication, are simply not taking it. Although there are many reasons for this "gap" in the treatment of osteoporosis, a major factor is physician and patient concerns over the risk of side effects, especially atypical femur fractures (AFFs) related to bisphosphonate (and perhaps other antiresorptive) drug therapy...
December 29, 2016: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28096530/associations-between-body-mass-index-related-genetic-variants-and-adult-body-composition-the-fenland-cohort-study
#4
E A D Clifton, F R Day, E De Lucia Rolfe, N G Forouhi, S Brage, S J Griffin, N J Wareham, K K Ong
BACKGROUND/OBJECTIVE: Body mass index (BMI) is a surrogate measure of adiposity but does not distinguish fat from lean or bone mass. The genetic determinants of BMI are thought to predominantly influence adiposity but this has not been confirmed. Here we characterise the association between BMI-related genetic variants and body composition in adults. SUBJECTS/METHODS: Among 9667 adults aged 29-64 years from the Fenland study, a genetic risk score for BMI (BMI-GRS) was calculated for each individual as the weighted sum of BMI-increasing alleles across 96 reported BMI-related variants...
January 18, 2017: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/28074250/cortical-porosity-exhibits-accelerated-rate-of-change-in-peri-compared-with-post-menopausal-women
#5
L A Burt, J L Bhatla, D A Hanley, S K Boyd
: The rate of change in bone density was not different between peri- and post-menopausal women. Differences in rate of change were observed in bone microarchitecture, specifically cortical porosity (Ct.Po), where peri-menopausal women increased +9% per year compared with the +6% per year for post-menopausal women. INTRODUCTION: The purpose of this study was to compare changes in bone density and microarchitecture in peri- and post-menopausal women over 6 years...
January 10, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/28062546/the-clinical-importance-of-quantifying-fat-distribution-during-androgen-deprivation
#6
Stephen John Foulkes, Robin M Daly, Steve Fraser
Androgen deprivation therapy (ADT) is now considered a mainstay in the treatment of metastatic and locally advanced prostate cancer (PCa). Despite well-established benefits of ADT in relation to overall survival, this treatment has been associated with a number of adverse effects, particularly with regard to key cardiometabolic risk factors including the development of insulin resistance, dyslipidaemia and increases in total and regional fat mass. In non-ADT populations, increased levels of visceral adipose tissue (VAT) are thought to be a key mediator of the increased cardiometabolic risk associated with weight gain, but this has received limited attention in men treated with ADT...
January 6, 2017: Endocrine-related Cancer
https://www.readbyqxmd.com/read/28034592/densitometer-specific-differences-in-the-correlation-between-body-mass-index-and-lumbar-spine-trabecular-bone-score
#7
Gillian Mazzetti, Claudie Berger, William D Leslie, Didier Hans, Lisa Langsetmo, David A Hanley, Christopher S Kovacs, Jerrilyn C Prior, Stephanie M Kaiser, K Shawn Davison, Robert Josse, Alexandra Papaioannou, Jonathan R Adachi, David Goltzman, Suzanne N Morin
Trabecular bone score (TBS) is a gray-level texture measure derived from lumbar spine dual-energy X-ray absorptiometry (DXA) images that predicts fractures independent of bone mineral density (BMD). Increased abdominal soft tissue in individuals with elevated body mass index (BMI) absorbs more X-rays during image acquisition for BMD measurement and must be accommodated by the TBS algorithm. We aimed to determine if the relationship between BMI and TBS varied between 2 major manufacturers' densitometers, because different densitometers accommodate soft tissues differently...
December 26, 2016: Journal of Clinical Densitometry
https://www.readbyqxmd.com/read/28032660/addressing-the-crisis-in-the-treatment-of-osteoporosis-a-path-forward
#8
Sundeep Khosla, Jane A Cauley, Juliet Compston, Douglas P Kiel, Clifford Rosen, Kenneth G Saag, Elizabeth Shane
Considerable data and media attention have highlighted a potential "crisis" in the treatment of osteoporosis. Specifically, despite the availability of several effective drugs to prevent fractures, many patients who need pharmacological therapy are either not being prescribed these medications or if prescribed a medication, are simply not taking it. Although there are many reasons for this "gap" in the treatment of osteoporosis, a major factor is physician and patient concerns over the risk of side effects, especially atypical femur fractures (AFFs) related to bisphosphonate (and perhaps other anti-resorptive) drug therapy...
December 29, 2016: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28026203/sexual-dimorphism-in-bone-muscle-relationship-in-young-adults
#9
Vera Zymbal, Kathleen F Janz, Fátima Baptista
The purpose of this study was to analyse associations between lean soft tissue (LST), a surrogate of skeletal muscle mass and key fracture-related geometric characteristics of the proximal femur. Moreover, we examined the role that muscle played on the proximal femur geometry in response to physical activity (PA). Participants were 83 young adults. Leg LST (exposure) was assessed by dual energy X-ray absorptiometry (DXA). Proximal femur geometry was derived from a left hip DXA scan. Geometric variables (outcomes) included the femoral neck axis length (FNAL), the femoral neck width (FNW), the neck-shaft angle and FNW|FNAL (an index of robustness)...
December 27, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28004226/prediction-of-femoral-strength-using-3d-finite-element-models-reconstructed-from-dxa-images-validation-against-experiments
#10
Lorenzo Grassi, Sami P Väänänen, Matti Ristinmaa, Jukka S Jurvelin, Hanna Isaksson
Computed tomography (CT)-based finite element (FE) models may improve the current osteoporosis diagnostics and prediction of fracture risk by providing an estimate for femoral strength. However, the need for a CT scan, as opposed to the conventional use of dual-energy X-ray absorptiometry (DXA) for osteoporosis diagnostics, is considered a major obstacle. The 3D shape and bone mineral density (BMD) distribution of a femur can be reconstructed using a statistical shape and appearance model (SSAM) and the DXA image of the femur...
December 21, 2016: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/28000375/cross-calibration-of-two-dual-energy-x-ray-densitometers-and-comparison-of-visceral-adipose-tissue-measurements-by-idxa-and-mri
#11
Martin Reinhardt, Paolo Piaggi, Barbara DeMers, Cathy Trinidad, Jonathan Krakoff
OBJECTIVE: Compare total percentage body fat (pfat) measurements between two densitometers and visceral adipose tissue (VAT) estimates between iDXA and magnetic resonance imaging (MRI) from the same defined abdominal region. METHODS: Participants [N = 93 (50 men, 43 women), BMI: 19.1-57.6 kg/m(2) ] underwent dual-energy X-ray absorptiometry (DXA) scans on two DXA systems (GE Healthcare Lunar iDXA and Lunar Prodigy), and a subgroup underwent abdominal MRI imaging for quantification of VAT...
December 21, 2016: Obesity
https://www.readbyqxmd.com/read/27999479/side-to-side-differences-between-dominant-and-non-dominant-arm-s-bone-density-and-isometric-handgrip-strength-in-males-and-females-aged-40-65-years-old
#12
Ermira Krasniqi, Mynyr Koni, Antigona Kabashi, Abedin Bahtiri, Selda Gjeli, Arben Boshnjaku
OBJECTIVE: This observational, cross-sectional study, investigates and compares the differences of BMD, T-score, Z-score and isometric strength between dominant (D) versus non-dominant (ND) arms of 162 subjects aged 40-65 in a developing, low income country (Kosova). MATERIAL AND METHODS: Bone Mineral Density (BMD), T-score and Z-score at distal forearm regions of both arms (measured by DXA scan), together with the Handgrip Isometric Strength (HIS) (by handgrip) were evaluated in a total subjects (53 Males and 109 Females)...
October 2016: Materia Socio-medica
https://www.readbyqxmd.com/read/27979755/effects-of-non-nutritive-sweetened-beverages-on-appetite-during-active-weight-loss-switch-protocol-for-a-randomized-controlled-trial-assessing-the-effects-of-non-nutritive-sweetened-beverages-compared-to-water-during-a-12-week-weight-loss-period-and-a-follow
#13
U Masic, J A Harrold, P Christiansen, D J Cuthbertson, C A Hardman, E Robinson, J C G Halford
BACKGROUND: Acute and medium-term intervention studies suggest that non-nutritive sweeteners (NNS) are beneficial for weight loss, however there is limited human data on the long-term effects of consuming NNS on weight loss, maintenance, and appetite. Further research is therefore required to elucidate the prolonged impact of NNS consumption on these outcome measures. METHODS/DESIGN: A randomized parallel groups design will be used to assess whether regular NNS beverage intake is equivalent to a water control in promoting weight loss over 12-weeks (weekly weight loss sessions; Phase I), then supporting weight maintenance over 40-weeks (monthly sessions; Phase II) and subsequently independent weight maintenance over 52-weeks (Phase III) in 432 participants...
December 12, 2016: Contemporary Clinical Trials
https://www.readbyqxmd.com/read/27966105/habitual-levels-of-higher-but-not-medium-or-low-impact-physical-activity-are-positively-related-to-lower-limb-bone-strength-in-older-women-findings-from-a-population-based-study-using-accelerometers-to-classify-impact-magnitude
#14
K Hannam, K C Deere, A Hartley, U A Al-Sari, E M Clark, W D Fraser, J H Tobias
: This study assessed the effect of accelerometry-measured higher impacts resulting from habitual weight-bearing activity on lower limb bone strength in older women. Despite higher impacts being experienced rarely in this population-based cohort, positive associations were observed between higher vertical impacts and lower limb bone size and strength. INTRODUCTION: We investigated whether the benefit of habitual weight-bearing physical activity (PA) for lower limb bone strength in older women is explained by exposure to higher impacts, as previously suggested by observations in younger individuals...
December 13, 2016: Osteoporosis International
https://www.readbyqxmd.com/read/27965946/prevalence-of-sarcopenia-adjusted-body-mass-index-in-the-korean-woman-based-on-the-korean-national-health-and-nutritional-examination-surveys
#15
Hyoung-Moo Park, Yong-Chan Ha, Jun-Il Yoo, Hyun-Jun Ryu
BACKGROUND: The purpose of this study was to determine cut-off point of appendicular skeletal muscle mass (ASM) adjusted body mass index (BMI) for sarcopenia in the Korean women and evaluate the prevalence of sarcopenia in postmenopausal women. METHODS: This study was based on the data obtained from 2008 to 2011 Korean National Health and Nutrition Examination Survey (KNHANES) IV and V. A whole body dual energy X-ray absorptiometry (DXA) scan and measurement of BMI were performed on individuals of ≥10 years old...
November 2016: Journal of Bone Metabolism
https://www.readbyqxmd.com/read/27933656/change-in-trabecular-bone-score-tbs-with-antiresorptive-therapy-does-not-predict-fracture-in-women-the-manitoba-bmd-cohort
#16
William D Leslie, Sumit R Majumdar, Suzanne N Morin, Didier Hans, Lisa M Lix
Bone mineral density (BMD) and trabecular bone score (TBS), along with additional clinical risk factors, can be used to identify individuals at high fracture risk. Whether change in TBS in untreated or treated women independently affects fracture risk is unclear. Using the Manitoba (Canada) DXA Registry containing all BMD results for the population we identified 9044 women age ≥40 years with two consecutive DXA scans and who were not receiving osteoporosis treatment at baseline (baseline mean age 62 ± 10 years)...
December 8, 2016: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/27920811/the-use-of-routine-non-density-calibrated-clinical-computed-tomography-data-as-a-potentially-useful-screening-tool-for-identifying-patients-with-osteoporosis
#17
Christopher John Burke, Manjiri M Didolkar, Huiman X Barnhart, Emily N Vinson
OBJECTIVES: To evaluate whether lumbar vertebral body density CT attenuation values measured in Hounsfield Units (HUs) on routine Computed Tomography (CT) examinations can be reliably measured with limited variability, and to evaluate for a correlation between HUs and bone mineral density as measured by dual energy X-ray absorptiometry (DXA) scan. METHODS: Retrospective review of a total of 249 routine MDCT examinations, performed to measure HUs at the first non-rib bearing lumbar vertebral body on axial images, cross-referenced to the lateral scout image...
May 2016: Clinical Cases in Mineral and Bone Metabolism
https://www.readbyqxmd.com/read/27881670/the-effect-of-alternate-day-caloric-restriction-on-the-metabolic-consequences-of-eight-days-bed-rest-in-healthy-lean-men-a-randomized-trial
#18
Nina Majlund Harder-Lauridsen, Signe Tellerup Nielsen, Sebastian Porsdam Mann, Mark Preben Lyngbæk, Fabiana Braga Benatti, Annika Reynberg Langkilde, Ian Law, Anne-Sophie Wedell-Neergaard, Carsten Thomsen, Kirsten Moller, Kristian Karstoft, Bente Klarlund Pedersen, Rikke Krogh-Madsen
BACKGROUND: Physical activity and alternate-day fasting/caloric restriction may both ameliorate aspects of the metabolic syndrome, such as insulin resistance, visceral fat mass accumulation, and cognitive impairment, by overlapping mechanisms. OBJECTIVE: To test the hypothesis that alternate-day caloric restriction (ADCR) with overall energy balance would reduce insulin resistance and accumulation of visceral fat, in addition to improving cognitive functions, after eight consecutive days in bed...
November 23, 2016: Journal of Applied Physiology
https://www.readbyqxmd.com/read/27881458/dosage-of-estradiol-bone-and-body-composition-in-turner-syndrome-a-5-year-randomized-controlled-clinical-trial
#19
Line Cleemann, Kirsten Holm, Hanne Kobbernagel, Bent Kristensen, Sven Oluf Skouby, Andreas Kryger Jensen, Claus H Gravholt
OBJECTIVE: Reduced bone mineral density (BMD) is seen in Turner syndrome (TS) with an increased risk of fractures, and body composition is characterized by increased body fat and decreased lean body mass. To evaluate the effect of two different doses of oral 17B-estradiol in young TS women on bone mineral density (BMD), biochemical markers of bone turnover and body composition with the hypothesis of a positive effect of the higher dose. DESIGN: A double-blind 5-year randomized controlled clinical trial...
February 2017: European Journal of Endocrinology
https://www.readbyqxmd.com/read/27875495/accuracy-and-reliability-of-assessing-lateral-compartmental-leg-composition-using-dxa
#20
Christiana J Raymond, Tyler A Bosch, Foster K Bush, Lisa S Chow, Donald R Dengel
PURPOSE: Investigate the accuracy and reliability of a novel dual X-ray absorptiometry (DXA) scanning method in the frontal plane for total, fat, and lean mass quantification of the anterior and posterior upper leg compartments. METHODS: Twenty-one (11 female; X[Combining Overline]age=20.3±1.3 yrs) college athletes were assessed for total and regional body composition using DXA. Segmentation of anterior/posterior thigh compartments was measured with participants lying on their right and left sides and the scanned leg elevated with two foam pads...
November 21, 2016: Medicine and Science in Sports and Exercise
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