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https://www.readbyqxmd.com/read/27925774/influence-of-backscatter-radiation-on-cranial-reconstruction-implants
#1
Yoshiaki Sakamoto, Naoyoshi Koike, Hideyuki Takei, Mari Ohno, Tomoru Miwa, Kazunari Yoshida, Naoyuki Shigematsu, Kazuo Kishi
OBJECTIVES: We aimed to evaluate backscatter dose variations in different cranial bone implant materials in an experimental model designed to simulate postoperative radiotherapy. METHODS: We assessed the radiation backscatter doses associated with sheet and mesh type titanium plates and hydroxyapatite (HAP) samples (porosity, 35%, 50%, and 85%). The samples were irradiated with 6 MV and 10 MV photon beams from a linear accelerator. Measurements were obtained using an ionization chamber and radiochromic films cut from the same batch...
December 7, 2016: British Journal of Radiology
https://www.readbyqxmd.com/read/27924851/senescence-novel-insight-into-dlx3-mutations-leading-to-enhanced-bone-formation-in-tricho-dento-osseous-syndrome
#2
Na Zhao, Dong Han, Haochen Liu, Yue Li, Sing-Wai Wong, Zhengyi Cao, Jian Xu, Xiaowei Zhang, Tao Cai, Yixiang Wang, Hailan Feng
The homeodomain transcription factor distal-less homeobox 3 gene (DLX3) is required for hair, tooth and skeletal development. DLX3 mutations have been found to be responsible for Tricho-Dento-Osseous (TDO) syndrome, characterized by kinky hair, thin-pitted enamel and increased bone density. Here we show that the DLX3 mutation (c.533 A>G; Q178R) attenuates osteogenic potential and senescence of bone mesenchymal stem cells (BMSCs) isolated from a TDO patient, providing a molecular explanation for abnormal increased bone density...
December 7, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27924381/dual-energy-x-ray-absorptiometry-and-fracture-prediction-in-patients-with-spinal-cord-injuries-and-disorders
#3
L Abderhalden, F M Weaver, M Bethel, H Demirtas, S Burns, J Svircev, H Hoenig, K Lyles, S Miskevics, L D Carbone
: Low T-scores at the hip predict incident fractures in persons with a SCI. INTRODUCTION: Persons with a spinal cord injury (SCI) have substantial morbidity and mortality following osteoporotic fractures. The objective of this study was to determine whether dual-energy X-ray absorptiometry (DXA) measurements predict osteoporotic fractures in this population. METHODS: A retrospective historical analysis that includes patients (n = 552) with a SCI of at least 2 years duration who had a DXA performed and were in the VA Spinal Cord Disorders Registry from fiscal year (FY) 2002-2012 was performed...
December 6, 2016: Osteoporosis International
https://www.readbyqxmd.com/read/27924380/adherence-to-the-2006-american-heart-association-s-diet-and-lifestyle-recommendations-for-cardiovascular-disease-risk-reduction-is-associated-with-bone-mineral-density-in-older-chinese
#4
G D Chen, D Ding, H Y Tian, Y Y Zhu, W T Cao, C Wang, Y M Chen
: This cross-sectional study investigated the association between the modified 2006 American Heart Association Diet and Lifestyle Recommendations (AHA-DLR) and bone mineral density in Chinese adults. We found that better adherence to the AHA-DLR associated with higher bone mineral density (BMD) at multiple sites. INTRODUCTION: Accumulating evidence shows that cardiovascular disease (CVD) and osteoporosis are associated with each other, yet little research has focused on whether strategies to reduce CVD risk could also benefit bone health...
December 6, 2016: Osteoporosis International
https://www.readbyqxmd.com/read/27924369/bone-marrow-microvessel-density-and-plasma-angiogenic-factors-in-myeloproliferative-neoplasms-clinicopathological-and-molecular-correlations
#5
Danijela Lekovic, Mirjana Gotic, Radek Skoda, Bojana Beleslin-Cokic, Natasa Milic, Olivera Mitrovic-Ajtic, Ronny Nienhold, Dijana Sefer, Tijana Suboticki, Marijana Buac, Dragana Markovic, Milos Diklic, Vladan P Cokic
Increased angiogenesis in BCR-ABL1 negative myeloproliferative neoplasms (MPNs) has been recognized, but its connection with clinical and molecular markers needs to be defined. The aims of study were to (1) assess bone marrow (BM) angiogenesis measured by microvessel density (MVD) using CD34 and CD105 antibodies; (2) analyze correlation of MVD with plasma angiogenic factors including vascular endothelial growth factor, basic fibroblast growth factor, and interleukin-8; (3) examine the association of MVD with clinicopathological and molecular markers...
December 6, 2016: Annals of Hematology
https://www.readbyqxmd.com/read/27924156/deficiency-of-atp6v1h-causes-bone-loss-by-inhibiting-bone-resorption-and-bone-formation-through-the-tgf-%C3%AE-1-pathway
#6
Xiaohong Duan, Jin Liu, Xueni Zheng, Zhe Wang, Yanli Zhang, Ying Hao, Tielin Yang, Hongwen Deng
Vacuolar-type H (+)-ATPase (V-ATPase) is a highly conserved, ancient enzyme that couples the energy of ATP hydrolysis to proton transport across vesicular and plasma membranes of eukaryotic cells. Previously reported mutations of various V-ATPase subunits are associated with increased bone density. We now show that haploinsufficiency for the H subunit of the V1 domain (ATP6V1H) is associated with osteoporosis in humans and mice. A genome-wide SNP array analysis of 1625 Han Chinese found that 4 of 15 tag SNPs (26...
2016: Theranostics
https://www.readbyqxmd.com/read/27923758/evidence-for-use-of-teriparatide-in-spinal-fusion-surgery-in-osteoporotic-patients
#7
REVIEW
Navjot Chaudhary, Jennifer S Lee, Joy Y Wu, Suzanne Tharin
Osteoporosis is defined as a bone mineral density (BMD) less than 2.5 standard deviations below the mean BMD at peak bone mass, or the presence of a fragility fracture. In the setting of osteoporosis, early hardware loosening is thought to cause decreased spinal fusion rates. The two mainstays of osteoporosis treatment are bisphosphonates and Teriparatide. Teriparatide, a form of synthetic parathyroid hormone (PTH), is an anabolic agent that increases osteoblast activity and, thereby, bone mass. Preclinical studies in animal models show that Teriparatide increases spinal fusion rates...
December 3, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27923594/synthesis-of-the-cyp24a1-major-metabolite-of-2%C3%AE-2-tetrazol-2-yl-ethyl-1%C3%AE-25-dihydroxyvitamin-d3
#8
REVIEW
Masashi Takano, Kaori Yasuda, Eri Tohyama, Erika Higuchi, Toshiyuki Sakaki, Atsushi Kittaka
Previously, we found that 2α-[2-(tetrazol-2-yl)ethyl]-1α,25-dihydroxyvitamin D3 (AH-1) showed higher osteocalcin promoter transactivation activity in human osteosarcoma (HOS) cells and a greater therapeutic effect on ovariectomized (OVX) rats for enhancing bone mineral density than those of 1α,25(OH)2D3 without hypercalcemic side effects in vivo. Although CYP24A1 catalyzes multi-step oxidations toward the CD-ring side chain of the active vitamin D3 [1α,25(OH)2D3], the CYP24A1-dependent metabolism of AH-1 tended to stop at the first step hydroxylation at the C24-position of AH-1...
December 3, 2016: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/27923169/primary-stability-of-unicompartmental-knee-arthroplasty-under-dynamic-flexion-movement-in-human-femora
#9
Thomas M Grupp, Melanie Holderied, Matthias F Pietschmann, Christian Schröder, Angélica P Islas Padilla, Christoph Schilling, Volkmar Jansson, Peter E Müller
BACKGROUND: The objective of our study was to evaluate the impact of a trabecular stem fixation versus a cortical teeth fixation technique on the primary stability of cemented unicompartmental femoral components under dynamic flexion movement loading conditions in human femora. METHODS: Ten fresh-frozen human knees of a mean donor age of 73.9years were used to perform medial unicompartmental knee arthroplasty under a less invasive parapatellar surgical approach...
November 26, 2016: Clinical Biomechanics
https://www.readbyqxmd.com/read/27922938/skeletal-muscle-mass-is-associated-with-higher-dietary-protein-intake-and-lower-body-fat-in-postmenopausal-women-a-cross-sectional-study
#10
Thaís R Silva, Poli M Spritzer
OBJECTIVE: We investigated the association between skeletal muscle mass and dietary protein intake, habitual physical activity, body composition, and metabolic variables. METHODS: One hundred three healthy postmenopausal women from southern Brazil (age 55.2 ± 4.9 y, body mass index 27.2 ± 4.6 kg/m) were enrolled. Bone mineral density, %body fat, %trunk fat mass, and appendicular lean mass were assessed by dual-energy x-ray absorptiometry, resting metabolic rate by indirect calorimetry, and habitual physical activity by pedometer...
December 5, 2016: Menopause: the Journal of the North American Menopause Society
https://www.readbyqxmd.com/read/27922240/associations-of-lean-and-fat-mass-measures-with-whole-body-bone-mineral-content-and-bone-mineral-density-in-female-adolescent-weightlifters-and-swimmers
#11
Şükran Nazan Koşar
Body composition and sport participation have been associated with bone mass. The purpose of this study was to determine the associations of lean and fat mass measures with whole body bone mineral content (BMC) and bone mineral density (BMD) in female adolescent weightlifters, swimmers and non-athletic counterparts. This study included a total of 25 female adolescents (mean age: 15.3±1.1 years). Body composition and bone mass were measured by dual-energy X-ray absorptiometry. In most of the studied variables weight lifters had higher values compared to swimmers and non-athletes (p < 0...
2016: Turkish Journal of Pediatrics
https://www.readbyqxmd.com/read/27921235/transplantation-of-collagen-scaffold-with-autologous-bone-marrow-mononuclear-cells-promotes-functional-endometrium-reconstruction-via-downregulating-%C3%AE-np63-expression-in-asherman-s-syndrome
#12
Guangfeng Zhao, Yun Cao, Xianghong Zhu, Xiaoqiu Tang, Lijun Ding, Haixiang Sun, Juan Li, Xinan Li, Chenyan Dai, Tong Ru, Hui Zhu, Jingjie Lu, Caimei Lin, Jingmei Wang, Guijun Yan, Huiyan Wang, Lei Wang, Yimin Dai, Bin Wang, Ruotian Li, Jianwu Dai, Yan Zhou, Yali Hu
Asherman's syndrome (AS) is a common disease that presents endometrial regeneration disorder. However, little is known about its molecular features of this aregenerative endometrium in AS and how to reconstruct the functioning endometrium for the patients with AS. Here, we report that ΔNp63 is significantly upregulated in residual epithelial cells of the impaired endometrium in AS; the upregulated-ΔNp63 induces endometrial quiescence and alteration of stemness. Importantly, we demonstrate that engrafting high density of autologous bone marrow mononuclear cells (BMNCs) loaded in collagen scaffold onto the uterine lining of patients with AS downregulates ΔNp63 expression, reverses ΔNp63-induced pathological changes, normalizes the stemness alterations and restores endometrial regeneration...
December 1, 2016: Science China. Life Sciences
https://www.readbyqxmd.com/read/27921185/hand-bone-loss-in-early-rheumatoid-arthritis-during-a-methotrexate-based-treat-to-target-strategy-with-or-without-adalimumab-a-substudy-of-the-optimized-treatment-algorithm-in-early-ra-opera-trial
#13
L M Ørnbjerg, M Østergaard, T Jensen, K Hørslev-Petersen, K Stengaard-Pedersen, P Junker, T Ellingsen, P Ahlquist, H Lindegaard, A Linauskas, A Schlemmer, M Y Dam, I Hansen, T Lottenburger, C G Ammitzbøll, A Jørgensen, S B Krintel, J Raun, M L Hetland, Ole Slot, Lars Kjær Nielsen, Henrik Skjødt, Ole Majgaard, Tove Lorenzen, Hans Christian Horn, Marcin Kowalski, Inger Lauge Johansen, Peter Mosborg Pedersen, Natalia Manilo, Henning Bliddal
This study aims to investigate 1-year hand bone loss (HBL1-year) in early rheumatoid arthritis (RA) patients treated with a methotrexate (MTX) and intra-articular triamcinolone treat-to-target strategy +/- adalimumab and to determine if HBL6months is associated with radiographic progression after 2 years. In a clinical trial (OPERA) of 180 treatment-naive early RA patients, bone mineral density (BMD) was estimated from hand radiographs with digital X-ray radiogrammetry (DXR) at baseline, after 6 (n = 90) and 12 months (n = 70) of follow-up...
December 5, 2016: Clinical Rheumatology
https://www.readbyqxmd.com/read/27921150/bone-mineral-density-is-decreased-in-fibromyalgia-syndrome-a-systematic-review-and-meta-analysis
#14
Sikarin Upala, Wai Chung Yong, Anawin Sanguankeo
Previous studies have shown that fibromyalgia syndrome (FMS) is associated with low level of physical activity and exercise, which may lead to an increased risk of osteoporosis. However, studies of bone mineral density (BMD) in fibromyalgia have shown conflicting results. Thus, we conducted a systematic review and meta-analysis to better characterize the association between FMS and BMD. A comprehensive search of the databases MEDLINE and EMBASE was performed from inception through May 2016. The inclusion criterion was the observational studies' assessment of the association between fibromyalgia and bone mineral density in adult subjects...
December 5, 2016: Rheumatology International
https://www.readbyqxmd.com/read/27921146/bone-loss-at-the-distal-femur-and-proximal-tibia-in-persons-with-spinal-cord-injury-imaging-approaches-risk-of-fracture-and-potential-treatment-options
#15
REVIEW
C M Cirnigliaro, M J Myslinski, M F La Fountaine, S C Kirshblum, G F Forrest, W A Bauman
Persons with spinal cord injury (SCI) undergo immediate unloading of the skeleton and, as a result, have severe bone loss below the level of lesion associated with increased risk of long-bone fractures. The pattern of bone loss in individuals with SCI differs from other forms of secondary osteoporosis because the skeleton above the level of lesion remains unaffected, while marked bone loss occurs in the regions of neurological impairment. Striking demineralization of the trabecular epiphyses of the distal femur (supracondylar) and proximal tibia occurs, with the knee region being highly vulnerable to fracture because many accidents occur while sitting in a wheelchair, making the knee region the first point of contact to any applied force...
December 5, 2016: Osteoporosis International
https://www.readbyqxmd.com/read/27921145/compressive-loading-of-the-murine-tibia-reveals-site-specific-micro-scale-differences-in-adaptation-and-maturation-rates-of-bone
#16
I Bergström, J G Kerns, A E Törnqvist, C Perdikouri, N Mathavan, A Koskela, H B Henriksson, J Tuukkanen, G Andersson, H Isaksson, A E Goodship, S H Windahl
: Loading increases bone mass and strength in a site-specific manner; however, possible effects of loading on bone matrix composition have not been evaluated. Site-specific structural and material properties of mouse bone were analyzed on the macro- and micro/molecular scale in the presence and absence of axial loading. The response of bone to load is heterogeneous, adapting at molecular, micro-, and macro-levels. INTRODUCTION: Osteoporosis is a degenerative disease resulting in reduced bone mineral density, structure, and strength...
December 5, 2016: Osteoporosis International
https://www.readbyqxmd.com/read/27920814/low-energy-trauma-induced-intercondylar-femoral-fracture
#17
Mathias Aeby, Tobias Wyss, Birgit Mentrup, Erdmute Kunstmann, Franz Jakob, Daniel Aeberli
We present a 44-year-old female patient with recurrent fragility fractures including an intercondylar femoral fracture and with normal planar bone densitometry. Diagnosis of hypophosphatasia was suggested by low volumetric cortical bone mineral density and laboratory findings. DNA sequencing revealed heterozygous mutations in the exons 5, 6 and 9 of the ALPL gene, thus confirming the suspected diagnosis.
May 2016: Clinical Cases in Mineral and Bone Metabolism
https://www.readbyqxmd.com/read/27920812/evaluation-of-the-bone-mineral-density-of-the-subjects-with-avascular-necrosis-of-hip-joint
#18
Mohammad Taghi Karimi, Seyed Mohammad Mousavi Nodoshan
BACKGROUND: The head of femur is deformed in subjects with Leg Calve Perthes Disease (LCPD). It may be due to an increase in loads applied on the hip, decrease in hip joint containment and decrease in bone mineral density (BMD) of femur. Unfortunately there is not enough evidence regarding BMD of femur in subjects with LCPD. Therefore, the aim of this study is to evaluate BMD in subjects with Perthes disease. METHOD: Two subjects with LCPD participated in this study...
May 2016: Clinical Cases in Mineral and Bone Metabolism
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
#19
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/27920803/bone-pain-mechanism-in-osteoporosis-a-narrative-review
#20
REVIEW
Consalvo Mattia, Flaminia Coluzzi, Ludovica Celidonio, Renato Vellucci
Bone pain in elderly people dramatically affects their quality of life, with osteoporosis being the leading cause of skeletal related events. Peripheral and central mechanisms are involved in the pathogenesis of the nervous system sensitization. Osteoporosis in the elderly has been associated with increased density of bone sensory nerve fibers and their pathological modifications, together with an over-expression of nociceptors sensitized by the lowering pH due to the osteoclastic activity. The activation of N-methyl-D-aspartate (NMDA) receptors and the microglia, as a response to a range of pathological conditions, represent the leading cause of central sensitization...
May 2016: Clinical Cases in Mineral and Bone Metabolism
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