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https://www.readbyqxmd.com/read/29331298/spatiotemporal-characterization-of-microdamage-accumulation-in-rat-ulnae-in-response-to-uniaxial-compressive-fatigue-loading
#1
Xuhui Zhang, Xiyu Liu, Zedong Yan, Jing Cai, Fei Kang, Shuai Shan, Pan Wang, Mingming Zhai, X Edward Guo, Erping Luo, Da Jing
Repetitive fatigue loading can induce microdamage accumulation in bone matrix, which results in impaired mechanical properties and increased fracture susceptibility. However, the spatial distribution and time-variant process of microdamage accumulation in fatigue-loaded skeleton, especially for linear microcracks which are known to initiate bone remodeling, remain not fully understood. In this study, the time-varying process of the morphology and distribution of microcracks in rat ulnae subjected to uniaxial compressive fatigue loading was investigated...
January 10, 2018: Bone
https://www.readbyqxmd.com/read/29327779/locally-delivered-ethyl-2-5-dihydroxybenzoate-using-3d-printed-bone-implant-for-promotion-of-bone-regeneration-in-a-osteoporotic-animal-model
#2
B-J Kwon, G M Seon, M H Lee, M-A Koo, M S Kim, D Kim, J-J Han, D Kim, J Kim, J-C Park
Osteoporosis is a disease characterized by low bone mass, most commonly caused by an increase in bone resorption that is not matched by sufficient bone formation. The most common complications of postmenopausal osteoporosis are bone-related defects and fractures. Fracture healing is a multifactorial bone regeneration process, influenced by both biological and mechanical factors related to age, osteoporosis and stability of the osteosynthesis. During the treatment of bone defects in osteoporotic conditions, imbalanced bone remodeling is the leading cause for implant failure...
January 12, 2018: European Cells & Materials
https://www.readbyqxmd.com/read/29315595/mid-to-long-term-clinical-outcome-of-giant-cell-tumor-of-bone-treated-with-calcium-phosphate-cement-following-thorough-curettage-and-phenolization
#3
Akihiko Takeuchi, Prakrit Suwanpramote, Norio Yamamoto, Toshiharu Shirai, Katsuhiro Hayashi, Hiroaki Kimura, Shinji Miwa, Takashi Higuchi, Kensaku Abe, Hiroyuki Tsuchiya
BACKGROUND AND OBJECTIVES: Giant cell tumors of bone (GCTB) are intermediate and locally aggressive bone tumor. Calcium phosphate cement (CPC) is a bone void filler used in orthopaedic surgery. This study investigated the clinical outcome of GCTB treated with thorough curettage, phenolization, and CPC. METHODS: We investigated 26 patients with at least 36 months of follow-up. The mean age and follow-up were 37 years (range: 19-63) and 87 months (range: 38-169), respectively...
January 8, 2018: Journal of Surgical Oncology
https://www.readbyqxmd.com/read/29306536/orthodontic-movement-after-regenerative-endodontic-procedure-case-report-and-long-term-observations
#4
Antonis Chaniotis
INTRODUCTION: Although regenerative treatment approaches in teeth with incomplete root formation and pulp necrosis have become part of the suggested therapeutic endodontic spectrum, little is known about the effect of orthodontic movement in the tissue that has been regenerated. Furthermore, as the number of adults undergoing orthodontic treatment increases, there is an increasing need to investigate the changes that these tissues may undergo during orthodontic movement. Here we describe the alterations observed after the application of orthodontic forces in a case of an apically root-fractured necrotic immature root that had been managed with regenerative endodontic procedures in the past...
January 3, 2018: Journal of Endodontics
https://www.readbyqxmd.com/read/29306083/fabrication-and-characterization-of-highly-porous-barium-titanate-based-scaffold-coated-by-gel-ha-nanocomposite-with-high-piezoelectric-coefficient-for-bone-tissue-engineering-applications
#5
Arian Ehterami, Mansure Kazemi, Bahareh Nazari, Payam Saraeian, Mahmoud Azami
It is well established that the piezoelectric effect plays an important physiological role in bone growth, remodeling and fracture healing. Barium titanate, as a well-known piezoelectric ceramic, is especially an attractive material as a scaffold for bone tissue engineering applications. In this regard, we tried to fabricate a highly porous barium titanate based scaffolds by foam replication method and polarize them by applying an external electric field. In order to enhance the mechanical and biological properties, polarized/non-polarized scaffolds were coated with gelatin and nanostructured HA and characterized for their morphologies, porosities, piezoelectric and mechanical properties...
December 30, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29305998/effects-of-mechanical-loading-on-cortical-defect-repair-using-a-novel-mechanobiological-model-of-bone-healing
#6
Chao Liu, Robert Carrera, Vittoria Flamini, Lena Kenny, Pamela Cabahug-Zuckerman, Benson M George, Daniel Hunter, Bo Liu, Gurpreet Singh, Philipp Leucht, Kenneth A Mann, Jill A Helms, Alesha B Castillo
Mechanical loading is an important aspect of post-surgical fracture care. The timing of load application relative to the injury event may differentially regulate repair depending on the stage of healing. Here, we used a novel mechanobiological model of cortical defect repair that offers several advantages including its technical simplicity and spatially confined repair program, making effects of both physical and biological interventions more easily assessed. Using this model, we showed that daily loading (5N peak load, 2Hz, 60 cycles, 4 consecutive days) during hematoma consolidation and inflammation disrupted the injury site and activated cartilage formation on the periosteal surface adjacent to the defect...
January 4, 2018: Bone
https://www.readbyqxmd.com/read/29300279/disease-modifying-actions-of-il-6-blockade-in-a-rat-model-of-bone-cancer-pain
#7
Bethany Remeniuk, Tamara King, Devki Suktankhar, Amy Nippert, Nancy Li, Fuying Li, Kejun Cheng, Kenner C Rice, Frank Porreca
Metastasis of cancer to the skeleton represents a debilitating turning point in the lives of patients. Skeletal metastasis leads to moderate to severe ongoing pain along with bone remodeling that can result in fracture, events that dramatically diminish quality of life. IL-6 levels are elevated in metastatic breast cancer patients and are associated with a lower survival rate. We therefore determined the consequences of inhibition of IL-6 signaling using a novel small molecule antagonist, TB-2-081, on bone integrity, tumor progression, and pain in a rodent model of breast cancer...
December 26, 2017: Pain
https://www.readbyqxmd.com/read/29291052/secondary-osteons-scale-allometrically-in-mammalian-humerus-and-femur
#8
A A Felder, C Phillips, H Cornish, M Cooke, J R Hutchinson, M Doube
Intra-cortical bone remodelling is a cell-driven process that replaces existing bone tissue with new bone tissue in the bone cortex, leaving behind histological features called secondary osteons. While the scaling of bone dimensions on a macroscopic scale is well known, less is known about how the spatial dimensions of secondary osteons vary in relation to the adult body size of the species. We measured the cross-sectional area of individual intact secondary osteons and their central Haversian canals in transverse sections from 40 stylopodal bones of 39 mammalian species (body mass 0...
November 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/29290604/grammont-humeral-design-versus-onlay-curved-stem-reverse-shoulder-arthroplasty-comparison-of-clinical-and-radiographic-outcomes-with-minimum-2-year-follow-up
#9
Giovanni Merolla, Gilles Walch, Francesco Ascione, Paolo Paladini, Elisabetta Fabbri, Antonio Padolino, Giuseppe Porcellini
BACKGROUND: There are few investigations comparing lateralized and medialized reverse total shoulder arthroplasty (RTSA) in patients with cuff tear arthropathy. This study assessed the outcomes of 2 RTSA designs. METHODS: Sixty-eight consecutive cuff tear arthropathy patients (74 shoulders) with a follow-up of at least 24 months received a Grammont or an onlay curved short-stem humeral component, with or without glenoid lateralization; a cementless humeral stem was implanted in >90%...
December 28, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/29281127/bone-tissue-collagen-maturity-and-mineral-content-increase-with-sustained-hyperglycemia-in-the-kk-ay-murine-model-of-type-2-diabetes
#10
Heather B Hunt, Jared C Pearl, David R Diaz, Karen B King, Eve Donnelly
Type 2 diabetes mellitus (T2DM) increases fracture risk for a given bone mineral density, which suggests that T2DM changes bone tissue properties independently of bone mass. In this study, we assessed the effects of hyperglycemia on bone tissue compositional properties, enzymatic collagen crosslinks, and advanced glycation endproducts (AGEs) in the KK-Ay murine model of T2DM using Fourier transform infrared imaging and high-performance liquid chromatography. Compared to KK-aa littermate controls (n = 8), proximal femoral bone tissue of KK-Ay mice (n = 14) exhibited increased collagen maturity, increased mineral content, and less heterogeneous mineral properties...
December 27, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/29277342/do-immune-cells-lead-the-way-in-subchondral-bone-disturbance-in-osteoarthritis
#11
REVIEW
Adrian Weber, Pok Man Boris Chan, Chunyi Wen
Osteoarthritis (OA) is a whole-joint disorder, and non-cartilage articular pathologies, e.g. subchondral bone disturbance, contribute substantially to the onset and progression of the disease. In the early stage of OA, abnormal mechanical loading leads to micro-cracks or micro-fractures that trigger a reparative process with angiogenesis and inflammatory response. With the progression of disease, cystic lesion, sclerosis and osteophytosis occur at tissue level, and osteoblast dysfunction at cellular level. Osteoblasts derived from OA sclerotic bone produce increased amount of type I collagen with aberrant Col1A1/A2 ratio and poor mineralization capability...
December 22, 2017: Progress in Biophysics and Molecular Biology
https://www.readbyqxmd.com/read/29259709/role-of-fibroblast-growth-factors-in-bone-regeneration
#12
REVIEW
Pornkawee Charoenlarp, Arun Kumar Rajendran, Sachiko Iseki
Bone is a metabolically active organ that undergoes continuous remodeling throughout life. However, many complex skeletal defects such as large traumatic bone defects or extensive bone loss after tumor resection may cause failure of bone healing. Effective therapies for these conditions typically employ combinations of cells, scaffolds, and bioactive factors. In this review, we pay attention to one of the three factors required for regeneration of bone, bioactive factors, especially the fibroblast growth factor (FGF) family...
2017: Inflammation and Regeneration
https://www.readbyqxmd.com/read/29259214/a-novel-design-approach-for-self-crack-healing-structural-ceramics-with-3d-networks-of-healing-activator
#13
Toshio Osada, Kiichi Kamoda, Masanori Mitome, Toru Hara, Taichi Abe, Yuki Tamagawa, Wataru Nakao, Takahito Ohmura
Self-crack-healing by oxidation of a pre-incorporated healing agent is an essential property of high-temperature structural ceramics for components with stringent safety requirements, such as turbine blades in aircraft engines. Here, we report a new approach for a self-healing design containing a 3D network of a healing activator, based on insight gained by clarifying the healing mechanism. We demonstrate that addition of a small amount of an activator, typically doped MnO localised on the fracture path, selected by appropriate thermodynamic calculation significantly accelerates healing by >6,000 times and significantly lowers the required reaction temperature...
December 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29246528/epigenetics-of-bone-disease
#14
Laetitia Michou
Histone deacetylation, DNA methylation, and micro-RNAs (miRNAs) are the three main epigenetic mechanisms that regulate gene expression. All the physiological processes involved in bone remodeling are tightly regulated by epigenetic factors. This review discusses the main epigenetic modifications seen in tumoral and nontumoral bone diseases, with emphasis on miRNAs. The role for epigenetic modifications of gene expression in the most common bone diseases is illustrated by drawing on the latest publications in the field...
December 12, 2017: Joint, Bone, Spine: Revue du Rhumatisme
https://www.readbyqxmd.com/read/29242803/as-a-definitive-choice-of-treatment-joint-and-defect-spanning-multiplanar-tubular-external-fixation-in-the-management-of-pediatric-open-defective-supracondylar-humerus-fracture-a-case-report
#15
Mehmet Demirel, Onur Tunali, Ismail Turkmen, Yavuz Saglam
Introduction: Although supracondylar fractures of the humerus are common in children, open fractures of are extremely rare injuries. Gustilo- Anderson Type-III fractures in the upper extremity are primarily associated with considerable bone loss resulting from high energy trauma. In this study, a case of open pediatric supracondylar humerus fracture treated by a joint and defect spanning multiplanar tubular external fixation is presented. Case Report: A boy aged 3 years suffered from a Gustilo-Anderson Type-IIIA supracondylar humerus fractures...
September 2017: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/29236162/bisphosphonates-prevent-age-related-weight-loss-in-japanese-postmenopausal-women
#16
Tomohiko Urano, Masataka Shiraki, Tatsuhiko Kuroda, Shiro Tanaka, Fumihiko Urano, Kazuhiro Uenishi, Satoshi Inoue
Decline of body weight with aging is a major risk factor for frailty, osteoporosis and fracture, suggesting that treatment for osteoporosis may affect body composition. Recently, we have shown that 5-year treatment with raloxifene prevented age-related weight loss, suggesting some other drugs for osteoporosis may also prevent a decrease in body weight with aging. The present study aimed to identify the relationship between bisphosphonate treatment and body composition markers. We measured bone mineral density (BMD), body composition, and bone remodeling markers in 551 Japanese postmenopausal women with bisphosphonate treatment, which included risedronate or alendronate treatment (BP-treatment group; N = 193) and without treatment by any osteoporosis drug (no-treatment group; N = 358) for 4-7 years (mean observation periods; 5...
December 13, 2017: Journal of Bone and Mineral Metabolism
https://www.readbyqxmd.com/read/29229668/multiple-myeloma-and-bone-the-fatal-interaction
#17
Silvia Marino, G David Roodman
Multiple myeloma (MM) is the second-most-common hematologic malignancy and the most frequent cancer to involve bone. MM bone disease (MMBD) has devastating consequences for patients, including dramatic bone loss, severe bone pain, and pathological fractures that markedly decrease the quality of life and impact survival of MM patients. MMBD results from excessive osteoclastic bone resorption and persistent suppressed osteoblastic bone formation, causing lytic lesions that do not heal, even when patients are in complete and prolonged remission...
December 11, 2017: Cold Spring Harbor Perspectives in Medicine
https://www.readbyqxmd.com/read/29227674/multivalent-presentation-of-peptide-targeting-groups-alters-polymer-biodistribution-to-target-tissues
#18
Maureen R Newman, Steven G Russell, Christopher S Schmitt, Ian A Marozas, Tzong-Jen Sheu, J Edward Puzas, Danielle S W Benoit
Drug delivery to bone is challenging, whereby drug distribution is commonly <1% of injected dose, despite development of several bone-targeted drug delivery systems specific to hydroxyapatite. These bone-targeted drug delivery systems still suffer from poor target cell localization within bone, as at any given time overall bone volume is far greater than acutely remodeled bone volume, which harbors relevant cell targets (osteoclasts or osteoblasts). Thus, there exists a need to target bone-acting drugs specifically to the cells responsible for bone remodeling...
December 11, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/29218771/menopause-related-appendicular-bone-loss-is-mainly-cortical-and-results-in-increased-cortical-porosity
#19
Åshild Bjørnerem, Xiaofang Wang, Minh Bui, Ali Ghasem-Zadeh, John L Hopper, Roger Zebaze, Ego Seeman
After menopause, remodeling becomes unbalanced and rapid. Each of the many remodeling transactions deposits less bone than it resorbed, producing microstructural deterioration. Trabecular bone is said to be lost more rapidly than cortical bone. However, because 80% of the skeleton is cortical, we hypothesized that most menopause-related bone loss and changes in bone microstructure are cortical, not trabecular in origin, and are the result of intracortical remodeling. Distal tibial and distal radial microstructure were quantified during 3...
December 8, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/29211870/osteonecrosis-of-the-jaw-and-rebound-hypercalcaemia-in-young-people-treated-with-denosumab-for-giant-cell-tumour-of-bone
#20
Suma Uday, Louie Gaston, Luke Rogers, Michael Parry, Johnathan Joffe, John Pearson, David Sutton, Robert Grimer, Wolfgang Högler
Context: Denosumab, an inhibitor of receptor activator of nuclear factor kappa-B ligand, is an approved treatment for giant cell tumour of bone (GCTB) in adults and 'skeletally mature' adolescents. Safety concerns include oversuppression of bone remodelling, with risk of osteonecrosis of the jaw [ONJ] and atypical femur fractures during treatment in adults, and rebound hypercalcaemia after treatment cessation in children. To date, ONJ has never been reported in children or adolescents...
December 1, 2017: Journal of Clinical Endocrinology and Metabolism
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