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Bone density

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https://www.readbyqxmd.com/read/29346300/trapezium-bone-density-a-comparison-of-measurements-by-dxa-and-ct
#1
Sebastian Breddam Mosegaard, Kamille Breddam Mosegaard, Nadia Bouteldja, Torben Bæk Hansen, Maiken Stilling
Bone density may influence the primary fixation of cementless implants, and poor bone density may increase the risk of implant failure. Before deciding on using total joint replacement as treatment in osteoarthritis of the trapeziometacarpal joint, it is valuable to determine the trapezium bone density. The aim of this study was to: (1) determine the correlation between measurements of bone mineral density of the trapezium obtained by dual-energy X-ray absorptiometry (DXA) scans by a circumference method and a new inner-ellipse method; and (2) to compare those to measurements of bone density obtained by computerized tomography (CT)-scans in Hounsfield units (HU)...
January 18, 2018: Journal of Functional Biomaterials
https://www.readbyqxmd.com/read/29345841/effects-of-high-impact-exercise-on-the-physical-properties-of-bones-of-ovariectomized-rats-fed-to-a-high-protein-diet
#2
Roberta Carminati Shimano, Gabriela Rezende Yanagihara, Ana Paula Macedo, Jessica Suzuki Yamanaka, Antônio Carlos Shimano, João Manuel R S Tavares, João Paulo Mardegan Issa
The aim of this study was to evaluate the effects of high-impact physical exercise as a prophylactic and therapeutic means in osteopenic bones of rats submitted to ovariectomy and protein diet intake. A total of 64 Wistar rats were divided into eight groups (n=8 each), being: OVX, ovx, standard diet and sedentary; OVXE, ovx, standard diet and jump; OVXP, ovx, high-protein diet and sedentary; and OVXEP, ovx, high-protein diet and jump; SH, sham, standard diet and sedentary; SHE, sham, standard diet and jump; SHP, sham, high-protein diet and sedentary; and SHEP, sham, high-protein-diet and jump...
January 18, 2018: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29344755/mathematical-modelling-of-bone-adaptation-of-the-metacarpal-subchondral-bone-in-racehorses
#3
Peta L Hitchens, Peter Pivonka, Fatemeh Malekipour, R Chris Whitton
In Thoroughbred racehorses, fractures of the distal limb are commonly catastrophic. Most of these fractures occur due to the accumulation of fatigue damage from repetitive loading, as evidenced by microdamage at the predilection sites for fracture. Adaptation of the bone in response to training loads is important for fatigue resistance. In order to better understand the mechanism of subchondral bone adaptation to its loading environment, we utilised a square root function defining the relationship between bone volume fraction [Formula: see text] and specific surface [Formula: see text] of the subchondral bone of the lateral condyles of the third metacarpal bone (MCIII) of the racehorse, and using this equation, developed a mathematical model of subchondral bone that adapts to loading conditions observed in vivo...
January 17, 2018: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/29344692/the-epidemiology-of-wrist-fractures-in-older-men-the-osteoporotic-fractures-in-men-mros-study
#4
N C Wright, E R Hooker, C M Nielson, K E Ensrud, S L Harrison, E S Orwoll, E Barrett-Connor
There is limited wrist fracture information on men. Our goal was to calculate frequency and identify risk factors for wrist fracture in the Osteoporotic Fractures in Men (MrOS) study. We confirmed that fracture history and certain medications are predictors, and identified novel predictors including markers of kidney function and physical performance. INTRODUCTION: To calculate the incidence of wrist fractures and their risk factors in older community-dwelling men from the US Osteoporotic Fractures in Men (MrOS) study...
January 17, 2018: Osteoporosis International
https://www.readbyqxmd.com/read/29344033/investigating-the-prevalence-of-low-bone-mass-in-children-of-southern-iran-and-its-associated-factors
#5
Forough Saki, Gholamhossein Ranjbar Omrani, Marjan Jeddi, Marzie Bakhshaieshkaram, Mohammad Hossein Dabbaghmanesh
Background: Improving peak bone mass and bone strength in the first years of life and enhancing it during young adulthood could prevent osteoporosis and fractures in the last years of life. We evaluated the prevalence of low bone mass in the lumbar and femoral neck and its associated factors in southern Iranian children. Methods: This is a cross-sectional study on healthy Iranian children aged 9 - 18 years old during 2011 - 2012. Dual energy X-ray absorptiometry (DEXA) was used for measuring bone mineral density (BMD)...
October 2017: International Journal of Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29343720/associations-between-vdr-gene-polymorphisms-and-osteoporosis-risk-and-bone-mineral-density-in-postmenopausal-women-a-systematic-review-and-meta-analysis
#6
Liang Zhang, Xin Yin, Jingcheng Wang, Daolinag Xu, Yongxiang Wang, Jiandong Yang, Yuping Tao, Shengfei Zhang, Xinmin Feng, Caifeng Yan
Results on the relationships between vitamin D receptor (VDR) gene polymorphisms and postmenopausal osteoporosis (PMOP) susceptibility and bone mineral density (BMD) are conflicting. The aim of the study is to identify more eligible studies that calculated pooled OR and WMD with 95% CI to assess their associations. Overall, there were significant correlations between VDR ApaI, VDR FokI and PMOP susceptibility. Subgroup analysis showed that VDR ApaI polymorphism significantly decreased the osteoporosis risk in Caucasian postmenopausal women...
January 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29343264/associations-between-circulating-adipokines-and-bone-mineral-density-in-patients-with-knee-osteoarthritis-a-cross-sectional-study
#7
Juan Wu, Jianhua Xu, Kang Wang, Qicui Zhu, Jingyu Cai, Jiale Ren, Shuang Zheng, Changhai Ding
BACKGROUND: Associations between adipokines and bone mineral density (BMD) in knee osteoarthritis (OA) remain indistinct. The aim of this study was to investigate the cross-sectional associations between serum levels of adipokines and BMD in patients with knee OA. METHODS: This study included 164 patients with symptomatic knee OA from the Anhui Osteoarthritis study. Serum levels of leptin, adiponectin, and resistin were measured using an enzyme-linked immunosorbent assay (ELISA)...
January 17, 2018: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29340971/denosumab-or-oral-bisphosphonates-in-primary-osteoporosis-a-real-life-study
#8
E Cairoli, S Palmieri, G Goggi, L Roggero, M Arosio, I Chiodini, C Eller-Vainicher
PURPOSE: To compare the response to denosumab (DMAb) therapy with that of oral bisphosphonate (BISPH) treatment in postmenopausal women with primary osteoporosis (PO). METHODS: In this retrospective study, we compared data of 75 PO female patients treated for 24 months with DMab (DMAb Group, age 72.6 ± 8.9 years) with those of 75 PO patients treated with oral bisphosphonates (BISPH Group), matched for age, body mass index, femoral bone mineral density (BMD), prevalent fragility fractures and familiar history of hip fracture...
January 16, 2018: Journal of Endocrinological Investigation
https://www.readbyqxmd.com/read/29340480/bone-repair-access-of-boneceramic%C3%A2-in-5-mm-defects-study-on-rat-calvaria
#9
André Luis da Silva Fabris, Leonardo Perez Faverani, Pedro Henrique Silva Gomes-Ferreira, Tárik Ocon Braga Polo, Joel Ferreira Santiago-Júnior, Roberta Okamoto
OBJECTIVE: The aim of this study was to evaluate the osteoconductive potential of BoneCeramic™ on bone healing in rat calvaria 5-mm defects. MATERIAL AND METHODS: A 5-mm calvaria bone defect was induced in three groups and the defect was not filled with biomaterial [Clot Group (CG)], autogenous bone (AG), or Bone Ceramic Group (BCG). Animals were euthanized after 14 or 28 days and the bone tissue within the central area of the bone defect was evaluated. Results were compared using ANOVA and Tukey test (p<0...
January 15, 2018: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/29340352/bone-healing-at-functionally-loaded-and-unloaded-screw-shaped-implants-supporting-single-crowns-a-histomorphometric-study-in-humans
#10
Daichi Yonezawa, Adriano Piattelli, Riccardo Favero, Mauro Ferri, Giovanna Iezzi, Daniele Botticelli
PURPOSE: To evaluate histologically and histomorphometrically the effect of a delayed load on healing at implants with a moderately rough surface. MATERIALS AND METHODS: Two solid titanium screw-shaped devices, 5 mm long and 3.5 mm in diameter, were inserted in the distal segments of the alveolar ridge of 16 volunteer patients in a nonsubmerged fashion. After 2 months, one implant was loaded, while the other was left unloaded. After 2 months, the two implants were collected from 10 patients using a sonic instrument, and ground sections were prepared from the biopsy specimens...
January 2018: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29340351/effect-of-low-level-laser-on-the-healing-of-bone-defects-filled-with-autogenous-bone-or-bioactive-glass-in-vivo-study
#11
Guilherme Santos Moreira, Patrick Henry Machado Alves, Luis Augusto Esper, Michyele Cristhiane Sbrana, Gisele da Silva Dalben, Karin Hermana Neppelenbroek, Ana Lúcia Pompéia Fraga de Almeida
PURPOSE: This study evaluated the effect of low-level laser therapy (LLLT) on the healing of bone defects filled with autogenous bone or bioactive glass. MATERIALS AND METHODS: A critical size defect with 5-mm diameter was created on the calvaria of 60 adult male rats divided into 6 groups (n = 10): group C (control), group LLLT (LLLT - GaAlAs, wavelength of 780 nm, power of 100 mW, energy density of 210 J/cm2 per point during 60 seconds/point, in five points, only once, after creation of the surgical defect), group AB (autogenous bone), group AB+LLLT (autogenous bone + LLLT), group BG (bioactive glass), group BG+LLLT (bioactive glass + LLLT)...
January 2018: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29340322/paricalcitol-versus-calcifediol-for-treating-hyperparathyroidism-in-kidney-transplant-recipients
#12
Josep M Cruzado, Ricardo Lauzurica, Julio Pascual, Roberto Marcen, Francesc Moreso, Alex Gutierrez-Dalmau, Amado Andrés, Domingo Hernández, Armando Torres, Maria Isabel Beneyto, Edoardo Melilli, Anna Manonelles, Manuel Arias, Manuel Praga
Introduction: Secondary hyperparathyroidism (SHPT) and vitamin D deficiency are common at kidney transplantation and are associated with some early and late complications. This study was designed to evaluate whether paricalcitol was more effective than nutritional vitamin D for controlling SHPT in de novo kidney allograft recipients. Methods: This was a 6-month, investigator-initiated, multicenter, open-label, randomized clinical trial. Patients with pretransplantation iPTH between 250 and 600 pg/ml and calcium <10 mg/dl were randomized to paricalcitol (PAR) or calcifediol (CAL)...
January 2018: KI Reports
https://www.readbyqxmd.com/read/29340241/risk-factors-for-osteoporosis-in-male-patients-with-chronic-obstructive-pulmonary-disease-in-taiwan
#13
Chu-Hsu Lin, Kai-Hua Chen, Chien-Min Chen, Chia-Hao Chang, Tung-Jung Huang, Chia-Hung Lin
Objective: To investigate the risk factors for osteoporosis in male Taiwanese patients with chronic obstructive pulmonary disease (COPD). Methods: This cross-sectional study evaluated male COPD outpatients and age-matched male subjects at a regional teaching hospital. The following data were obtained and analyzed: bone mineral density of the lumbar spine and hip on dual-energy X-ray absorptiometry, demographic characteristics, questionnaire interview results, pulmonary function test results, chest posterior-anterior radiographic findings, and biochemical and high-sensitivity C-reactive protein (hs-CRP) levels...
2018: PeerJ
https://www.readbyqxmd.com/read/29339988/impact-of-futsal-and-swimming-participation-on-bone-health-in-young-athletes
#14
André Seabra, Ricardo J Fernandes, Elisa Marques, Miguel Moura, Esther Ubago-Guisado, Enrique Hernando, Leonor Gallardo
Physical activity plays a crucial role in bone mass acquisition during childhood and adolescence, with weightbearing and high-impact sport activities being more beneficial. This study sought to evaluate the impact of different sports activities on bone mineral density and content in male Portuguese athletes. Seventy adolescent boys (aged 12-15 years) including 28 futsal players (FG), 20 swimmers (SG) and 22 non-athletic adolescents used as control subjects (CG), participated in the current study. Areal bone mineral density (aBMD) and areal bone mineral content (aBMC) were measured by dual energy x-ray absorptiometry (DEXA)...
December 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29339450/cardiac-macrophages-promote-diastolic-dysfunction
#15
Maarten Hulsmans, Hendrik B Sager, Jason D Roh, María Valero-Muñoz, Nicholas E Houstis, Yoshiko Iwamoto, Yuan Sun, Richard M Wilson, Gregory Wojtkiewicz, Benoit Tricot, Michael T Osborne, Judy Hung, Claudio Vinegoni, Kamila Naxerova, David E Sosnovik, Michael R Zile, Amy D Bradshaw, Ronglih Liao, Ahmed Tawakol, Ralph Weissleder, Anthony Rosenzweig, Filip K Swirski, Flora Sam, Matthias Nahrendorf
Macrophages populate the healthy myocardium and, depending on their phenotype, may contribute to tissue homeostasis or disease. Their origin and role in diastolic dysfunction, a hallmark of cardiac aging and heart failure with preserved ejection fraction, remain unclear. Here we show that cardiac macrophages expand in humans and mice with diastolic dysfunction, which in mice was induced by either hypertension or advanced age. A higher murine myocardial macrophage density results from monocyte recruitment and increased hematopoiesis in bone marrow and spleen...
January 16, 2018: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/29339151/practical-considerations-for-obtaining-high-quality-quantitative-computed-tomography-data-of-the-skeletal-system
#16
REVIEW
Karen L Troy, W Brent Edwards
Quantitative CT (QCT) analysis involves the calculation of specific parameters such as bone volume and density from CT image data, and can be a powerful tool for understanding bone quality and quantity. However, without careful attention to detail during all steps of the acquisition and analysis process, data can be of poor- to unusable-quality. Good quality QCT for research requires meticulous attention to detail and standardization of all aspects of data collection and analysis to a degree that is uncommon in a clinical setting...
January 12, 2018: Bone
https://www.readbyqxmd.com/read/29338906/virtual-computed-tomography-morphometry-of-the-patella-for-estimation-of-sex-using-postmortem-japanese-adult-data-in-forensic-identification
#17
Tomomi Michiue, Asmaa Mohammed Hishmat, Shigeki Oritani, Kazunori Miyamoto, Mohamed Farghally Amin, Takaki Ishikawa, Hitoshi Maeda
In forensic anthropological identification of human remains and single bones, computed tomography (CT) data analysis facilitates volumetric and radiographic density analyses, and a recently developed automated analysis system markedly improved the performance, accuracy, and reproducibility of three-dimensional (3-D) reconstruction. The present study aimed to investigate virtual CT morphometry of the patella for the estimation of sex using postmortem CT data of forensic autopsy cases of Japanese individuals aged ≥18 years (total n=220; 110 males and 110 females; estimated postmortem interval <88h), especially with regard to the efficacy of 3-D bone volumetry...
November 24, 2017: Forensic Science International
https://www.readbyqxmd.com/read/29338458/tenofovir-alafenamide-taf-treatment-of-hbv-what-are-the-unanswered-questions
#18
Mauro Viganò, Alessandro Loglio, Glenda Grossi, Pietro Lampertico
Tenofovir disoproxil fumarate (TDF), an ester prodrug of tenofovir (TFV), is one of the recommended drugs for chronic hepatitis B (CHB) patients. However, reduced kidney function and loss of bone mineral density have been reported in some CHB patients treated with TDF. Consequent to these safety issues, tenofovir alafenamide (TAF) [Vemlidy®], a phosphonate prodrug of TFV, was developed for the treatment of CHB patients. Areas covered: The favourable pharmacological profile of TAF allows a marked reduction in dosage (25 mg/day) thus reducing systemic exposure to tenofovir and improving the bone and renal safety, keeping however the same virological efficacy, compared to TDF 300 mg/day...
January 17, 2018: Expert Review of Anti-infective Therapy
https://www.readbyqxmd.com/read/29338385/does-the-mesenchymal-stem-cell-source-influence-smooth-muscle-regeneration-in-tissue-engineered-urinary-bladders
#19
Marta Pokrywczynska, Arkadiusz Jundzill, Karolina Warda, Lukasz Buchholz, Marta Rasmus, Jan Adamowicz, Magdalena Bodnar, Andrzej Marszalek, Anna Helmin-Basa, Jacek Michalkiewicz, Maciej Gagat, Alina Grzanka, Malgorzata Frontczak-Baniewicz, Agata Magdalena Gastecka, Tomasz Kloskowski, Maciej Nowacki, Camillo Ricordi, Tomasz Drewa
A variety of tissue engineering techniques utilizing different cells and biomaterials are currently being explored to construct urinary bladder walls de novo, but so far no approach is clearly superior. The aim of this study was to determine whether mesenchymal stem cells (MSCs) isolated from different sources, (bone marrow [BM-MSCs] and adipose tissue [ADSCs]), differ in their potential to regenerate smooth muscles in tissue-engineered urinary bladders and to determine an optimal number of MSCs for urinary bladder smooth muscle regeneration...
November 2017: Cell Transplantation
https://www.readbyqxmd.com/read/29338102/circulating-serum-25-hydroxyvitamin-d-levels-and-bone-mineral-density-mendelian-randomization-study
#20
Susanna C Larsson, Håkan Melhus, Karl Michaëlsson
There is considerable discussion of the importance for increased serum 25-hydroxyvitamin D (S-25OHD) concentration associated with adequacy for bone health. Accordingly, whether long-term high S-25OHD concentration in general positively affects bone mineral density (BMD) is uncertain. We used a Mendelian randomization design to determine the association between genetically increased S-25OHD concentrations and BMD. Five single-nucleotide polymorphisms (SNPs) in or near genes encoding enzymes and carrier proteins involved in vitamin D synthesis or metabolism were used as instrumental variables to genetically predict one standard deviation increase in S-25OHD concentration...
January 16, 2018: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
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