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Bone mineral density

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https://www.readbyqxmd.com/read/29150298/spontaneous-osteoclastogenesis-hypothesis-for-gender-unrelated-osteoporosis-screening-and-diagnosis
#1
F Salamanna, R Giardino, M Fini
Women are at greater risk of developing osteoporosis (OP). However, in the past few years it has become more widely recognized that OP is a significant problem also in men although OP is frequently under-diagnosed and, consequently, under treated in men. Most guidelines, screening and fracture risk evaluation methods as well as pharmacologic agents have been developed for women and then adapted to men. Bone Mineral Density (BMD) measurement by Dual X-ray Absorptiometry (DEXA) is reported as T score and the capability of DEXA to diagnose OP and predict fracture risk is still debated...
November 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/29150107/pre-sarcopenia-and-bone-mineral-density-in-adults-submitted-to-hematopoietic-stem-cell-transplantation
#2
Cristiane Pavan Pereira, Denise Johnsson Campos Amaral, Vaneuza Araujo Moreira Funke, Victória Zeghbi Cochenski Borba
BACKGROUND: The aim of this study was to evaluate the prevalence of pre-sarcopenia and bone mineral density after hematopoietic stem cell transplantation. METHODS: The study group consisted of over 18-year-old patients who had been submitted to allogeneic transplantation at least one year previously. Patients and healthy controls were matched by sex, ethnic background, age, and body mass index. Body composition and bone mineral density were measured by dual-energy X-ray absorptiometry...
October 2017: Revista Brasileira de Hematologia e Hemoterapia
https://www.readbyqxmd.com/read/29149200/heterozygous-deletion-of-both-sclerostin-sost-and-connexin43-gja1-genes-in-mice-is-not-sufficient-to-impair-cortical-bone-modeling
#3
Susan K Grimston, Francesca Fontana, Marcus Watkins, Roberto Civitelli
Connexin43 (Cx43) is the main gap junction protein expressed in bone forming cells, where it modulates peak bone mass acquisition and cortical modeling. Genetic ablation of the Cx43 gene (Gja1) results in cortical expansion with accentuated periosteal bone formation associated with decreased expression of the Wnt inhibitor sclerostin. To determine whether sclerostin (Sost) down-regulation might contribute to periosteal expansion in Gja1 deficient bones, we took a gene interaction approach and crossed mice harboring germline null alleles for Gja1 or Sost to generate single Gja1+/-and Sost+/-and double Gja1+/-;Sost+/-heterozygous mice...
2017: PloS One
https://www.readbyqxmd.com/read/29147753/defective-wnt-signaling-associates-with-bone-marrow-fibrosis-a-cross-sectional-cohort-study-in-a-family-with-wnt1-osteoporosis
#4
R E Mäkitie, R Niinimäki, S Kakko, T Honkanen, P E Kovanen, O Mäkitie
This study explores bone marrow function in patients with defective WNT1 signaling. Bone marrow samples showed increased reticulin and altered granulopoiesis while overall hematopoiesis was normal. Findings did not associate with severity of osteoporosis. These observations provide new insight into the role of WNT signaling in bone marrow homeostasis. INTRODUCTION: WNT signaling regulates bone homeostasis and survival and self-renewal of hematopoietic stem cells. Aberrant activation may lead to osteoporosis and bone marrow pathology...
November 16, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/29147750/the-association-between-childhood-fractures-and-adolescence-bone-outcomes-a-population-based-study-the-troms%C3%A3-study-fit-futures
#5
T Christoffersen, N Emaus, E Dennison, A-S Furberg, L Gracia-Marco, G Grimnes, O A Nilsen, D Vlachopoulos, A Winther, L A Ahmed
Childhood fracture may predict persistent skeletal fragility, but it may also reflect high physical activity which is beneficial to bone development. We observe a difference in the relationship between previous fracture and bone outcome across physical activity level and sex. Further elaboration on this variation is needed. PURPOSE: Childhood fracture may be an early marker of skeletal fragility, or increased levels of physical activity (PA), which are beneficial for bone mineral accrual...
November 16, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/29146302/mechanisms-involved-in-bone-resorption-regulated-by-vitamin-d
#6
REVIEW
Yuko Nakamichi, Nobuyuki Udagawa, Tatsuo Suda, Naoyuki Takahashi
Active forms of vitamin D enhance osteoclastogenesis in vitro and in vivo through the vitamin D receptor (VDR) in osteoblast-lineage cells consisting of osteoblasts and osteocytes. This pro-resorptive activity was evident basically with higher concentrations of active vitamin D than those expected in physiological conditions. Nevertheless, vitamin D compounds have been used in Japan for treating osteoporosis to increase bone mineral density (BMD). Of note, the increase in BMD by long-term treatment with pharmacological (=near-physiological) doses of vitamin D compounds was caused by the suppression of bone resorption...
November 13, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/29146288/unusual-iliac-crest-stress-fracture-in-a-marathoner-a-case-report
#7
Amy M West, Kelly C McInnis
This case presentation describes a 50-year-old healthy woman who developed left sided hip pain while training for the Boston Marathon. Magnetic Resonance Imaging (MRI) demonstrates a stress fracture of the left iliac body. This injury is unique in that it did not occur in the setting of low bone mineral density and it does not fall into the current published radiographic categorization based on location of injury. This case illustrates an uncommon and atypical bone stress injury in an endurance athlete. It should be considered in the differential diagnosis of runners presenting with hip or lumbopelvic pain...
November 13, 2017: PM & R: the Journal of Injury, Function, and Rehabilitation
https://www.readbyqxmd.com/read/29146231/is-hungry-bone-syndrome-a-cause-of-postoperative-hypocalcemia-after-total-thyroidectomy-in-thyrotoxicosis-a-prospective-study-with-bone-mineral-density-correlation
#8
Poongkodi Karunakaran, Chandrasekaran Maharajan, Srinivasan Ramalingam, Suresh Venkatesh Rachmadugu
BACKGROUND: Hungry bone syndrome is a well-established cause of postoperative hypocalcemia in thyrotoxicosis. To date, the incidence of hungry bone syndrome after total thyroidectomy is unclear. This prospective study examined the incidence of postthyroidectomy hungry bone syndrome and its correlation with preoperative bone mineral density. METHODS: Forty thyrotoxic subjects (Group A; age: mean ± SD; 36.5 ± 9.8 years) and 40 euthyroid controls with benign thyroid nodules (Group B) undergoing total thyroidectomy were evaluated for preoperative bone mineral density and serum calcium, magnesium, phosphorus, parathyroid hormone, alkaline phosphatase, and 25-Hydroxy Vitamin D serially...
November 14, 2017: Surgery
https://www.readbyqxmd.com/read/29145611/identification-of-novel-potentially-pleiotropic-variants-associated-with-osteoporosis-and-obesity-using-cfdr-method
#9
Yuan Hu, Li-Jun Tan, Xiang-Ding Chen, Zhen Liu, Shi-Shi Min, Qin Zeng, Hui Shen, Hong-Wen Deng
Context: Genome-wide association studies (GWASs) have been successful in identifying loci associated with osteoporosis and obesity. However, the findings just explain a small fraction of the total genetic variance. Objective: The aim of this study was to identify novel pleiotropic genes important in osteoporosis and obesity. Design and Setting: A pleiotropic conditional false discovery rate (cFDR) method was applied to three independent GWAS summary statistics of femoral neck bone mineral density (FN BMD), body mass index (BMI) and waist-hip ratio (WHR)...
November 14, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29145609/the-differential-effects-of-hiv-and-hcv-on-bone-micro-architecture-and-fracture-risk
#10
Roger J Bedimo, Beverley Adams-Huet, John Poindexter, Geri Brown, Irfan Farukhi, Rosinda Castanon, Diana Turner, Teresa Moore, Pablo Tebas, Naim M Maalouf
Background: HIV/HCV co-infected subjects have a significantly greater osteoporotic fracture risk than HIV-infected, despite the fact that HIV/HCV co-infection has not been associated with lower bone mineral density (BMD) than HIV or HCV alone. We evaluated if changes in bone microarchitecture , measured by trabecular bone score (TBS) could explain these differences. Design: We performed a prospective, cross-sectional cohort study of virologically suppressed HIV, untreated HCV, HIV/HCV co-infected and non-infected controls...
November 14, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29145296/approach-to-the-patient-with-pregnancy-and-lactation-associated-osteoporosis-a-case-report-and-a-review-of-the-literature
#11
Min Zhang, Ping Chen, Bin Li, Juan Du, Ting Pan, Jingyan Chen
RATIONALE: Pregnancy and lactation-associated osteoporosis (PLO) is very rare, but it can cause severe vertebral compression fractures with disabling back pain. Although it is a rare, PLO must be kept in mind in the differential diagnosis in patients presenting with low back pain during or after pregnancy. PATIENT CONCERNS: A 23-year-old woman who suffered from lumbago and fractures in the vertebral column 1 month after delivery. DIAGNOSIS: Pregnancy and lactation-associated osteoporosis...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29144924/re-enterocystoplasty-the-long-term-effects-on-bone-mineral-density
#12
Douglas A Canning
No abstract text is available yet for this article.
December 2017: Journal of Urology
https://www.readbyqxmd.com/read/29144808/osteoporotic-fractures-during-bisphosphonate-drug-holiday-fractures-bisphosphonate-drug-holidays
#13
Brittany Bindon, William Adams, Neelam Balasubramanian, Jasmin Sandhu, Pauline Camacho
OBJECTIVE: Bisphosphonate (BP) drug holidays are recommended to lower the risk of rare adverse events, such as atypical femoral fractures and osteonecrosis of the jaw. However, there are minimal data on the optimal duration of these holidays. Our aim was to determine the clinical and laboratory parameters associated with increased fracture risk in patients on BP drug holiday. METHODS: A retrospective chart review was conducted of 401 patients with osteopenia or osteoporosis who began a BP drug holiday from 2004 to 2013...
November 16, 2017: Endocrine Practice
https://www.readbyqxmd.com/read/29144803/endocrine-manifestations-of-primary-hyperoxaluria
#14
Shatha Murad, Yuval Eisenberg
OBJECTIVE: Primary hyperoxaluria type 1 (PH1) is a rare metabolic disorder of oxalate overproduction. It is associated with urolithiasis and nephrocalcinosis which progress to ESRD and systemic oxalosis. As oxalate deposits in tissues, non-parathyroid hormone (nonPTH) mediated hypercalcemia, oxalate osteopathy, primary hypothyroidism and primary hypogonadism develop. In this review, we will present a case of PH1 and provide an overview of this clinical entity and its endocrine manifestations...
November 16, 2017: Endocrine Practice
https://www.readbyqxmd.com/read/29143443/multiscale-characterisation-of-cortical-bone-composition-microstructure-and-nanomechanical-properties-in-experimentally-induced-osteoporosis
#15
Furqan A Shah, Adrian Stoica, Carina Cardemil, Anders Palmquist
Cortical bone plays a vital role in determining overall bone strength. We investigate the structural, compositional, and nanomechanical properties of cortical bone following ovariectomy (OVX) of 12 week old Sprague Dawley rats, since this animal model is frequently employed to evaluate the performance of implantable biomaterials in compromised bone healing conditions. Morphological parameters and material properties of bone in the geometrical centre of the femoral cortex were investigated four and eight weeks post-OVX and in unoperated controls (Ctrl), using X-ray micro-computed tomography, backscattered electron scanning electron microscopy, Raman spectroscopy, and nanoindentation...
November 16, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29143140/impact-of-conventional-medical-therapy-on-bone-mineral-density-and-bone-turnover-in-adult-patients-with-x-linked-hypophosphatemia-a-6-year-prospective-cohort-study
#16
Vikram Vinod Shanbhogue, Stinus Hansen, Niklas Rye Jørgensen, Signe Sparre Beck-Nielsen
X-linked hypophosphatemia (XLH) is a rare, inheritable disorder manifesting as rickets in children and osteomalacia in adults. While conventional medical treatment with oral phosphate and alfacalcidol is recommended in childhood, it is undecided whether adults should continue therapy. The aim of this 6-year prospective study was to determine the impact of conventional medical treatment on areal bone mineral density (aBMD), bone turnover markers (BTMs) and measures of calcium homeostasis in 27 adult patients with XLH, 11 of whom received medical treatment...
November 15, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/29141630/ct-based-analysis-of-muscle-volume-and-degeneration-of-gluteus-medius-in-patients-with-unilateral-hip-osteoarthritis
#17
Takako Momose, Yutaka Inaba, Hyonmin Choe, Naomi Kobayashi, Taro Tezuka, Tomoyuki Saito
BACKGROUND: The gluteus medius (GMED) affects hip function as an abductor. We evaluated muscle volume and degeneration of the GMED by using CT-based analysis and assessed factors that affect hip abductor strength in patients with unilateral hip osteoarthritis (OA). METHODS: We examined clinical and imaging findings associated with hip abductor strength in consecutive 50 patients with unilateral hip OA. Hip abductor muscle strength and Harris hip score (HHS) were assessed...
November 15, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29141022/trabecular-bone-in-the-calcaneus-of-runners
#18
Andrew Best, Brigitte Holt, Karen Troy, Joseph Hamill
Trabecular bone of the human calcaneus is subjected to extreme repetitive forces during endurance running and should adapt in response to this strain. To assess possible bone functional adaptation in the posterior region of the calcaneus, we recruited forefoot-striking runners (n = 6), rearfoot-striking runners (n = 6), and non-runners (n = 6), all males aged 20-41 for this institutionally approved study. Foot strike pattern was confirmed for each runner using a motion capture system. We obtained high resolution peripheral computed tomography scans of the posterior calcaneus for both runners and non-runners...
2017: PloS One
https://www.readbyqxmd.com/read/29140875/bone-mineral-density-declines-twice-as-quickly-among-hiv-infected-women-compared-to-men
#19
Kristine M Erlandson, Jordan E Lake, Myung Sim, Julian Falutz, Carla M Prado, Ana Rita Domingues da Silva, Todd T Brown, Giovanni Guaraldi
BACKGROUND: Initial declines in bone mineral density (BMD) following antiretroviral therapy (ART) initiation in HIV are well described, but data on long-term changes and risk factors for decline, particularly among women, are limited. METHODS: HIV-infected men and women in the Modena Metabolic Clinic underwent dual-energy X-ray absorptiometry (DXA) scans every 6-12 months for up to 10 years (median 4.6 years). Mixed effect regression model in combined and sex-stratified models determined annual rates of decline and clinical factors associated with BMD...
November 11, 2017: Journal of Acquired Immune Deficiency Syndromes: JAIDS
https://www.readbyqxmd.com/read/29140591/preventive-effects-of-tonsil-derived-mesenchymal-stem-cells-on-osteoradionecrosis-in-a-rat-model
#20
Hae Sang Park, Jihae Lee, Jin-Woo Kim, Ha Young Kim, Soo Yeon Jung, Sung Min Lee, Chan Hum Park, Han Su Kim
BACKGROUND: The purpose of this study was to investigate the effects of tonsil-derived mesenchymal stem cells (MSCs) on osteoradionecrosis (ORN). METHOD: We generated a mandibular ORN rat model using a combination of 20-Gy single-dose irradiation and tooth extraction. Study groups were negative control (tooth extraction only), ORN group (irradiation, tooth extraction), Matrigel-1 group (Matrigel; BD Biosciences, San Jose, CA; irradiation, Matrigel application immediately after tooth extraction), tonsil-derived MSC-1 group (irradiation, tonsil-derived MSC application immediately after tooth extraction), Matrigel-4 group (irradiation, Matrigel application 4 weeks after tooth extraction), and tonsil-derived MSC-4 group (irradiation, tonsil-derived MSC application 4 weeks after tooth extraction)...
November 15, 2017: Head & Neck
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