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Bone Remodeling

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https://www.readbyqxmd.com/read/28734258/mechanical-properties-and-biocompatibility-of-porous-titanium-scaffolds-for-bone-tissue-engineering
#1
Yunhui Chen, Jessica Ellen Frith, Ali Dehghan-Manshadi, Hooyar Attar, Damon Kent, Nicolas Dominique Mathieu Soro, Michael J Bermingham, Matthew S Dargusch
Synthetic scaffolds are a highly promising new approach to replace both autografts and allografts to repair and remodel damaged bone tissue. Biocompatible porous titanium scaffold was manufactured through a powder metallurgy approach. Magnesium powder was used as space holder material which was compacted with titanium powder and removed during sintering. Evaluation of the porosity and mechanical properties showed a high level of compatibility with human cortical bone. Interconnectivity between pores is higher than 95% for porosity as low as 30%...
July 13, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28727345/-denosumab-in-clinical-practice-beware-before-during-and-after
#2
Olivier Lamy, Elena Gonzalez-Rodriguez, Delphine Stoll, Bérengère Aubry-Rozier
Denosumab is a very effective treatment of osteoporosis, easy to use and very well tolerated. Due to some associated risks, a close clinical follow-up is necessary. Before the first injection, it is necessary to correct hypocalcaemia or vitamin D deficiency when present. Calcemia has to be followed in case of renal insufficiency. Injections of denosumab should be done scrupulously every 6 months (± 3 weeks). Discontinuation of denosumab is associated with a severe rebound effect characterized by increased markers of bone remodeling, a rapid decrease of bone density values, and a risk of multiple spontaneous vertebral fractures...
April 19, 2017: Revue Médicale Suisse
https://www.readbyqxmd.com/read/28725933/-callus-distraction-and-bone-transport-in-the-treatment-of-bone-defects
#3
REVIEW
R Baumgart, B Schuster, T Baumgart
BACKGROUND: The method of "callus distraction" is the only technique which spontaneously produces vascularized bone within the surrounding soft tissues during lengthening reconstructive procedures. Remodeling of the regenerate bone to specific mechanical load can be influenced by the surgeon. In principle, there is no limit to the amount of new bone formation which can be created; this vascularized bone is both resistant to infection and can be created to replace resected infected bone...
July 19, 2017: Der Orthopäde
https://www.readbyqxmd.com/read/28723729/wnt-signaling-in-cardiovascular-disease-opportunities-and-challenges
#4
Austin Gay, Dwight A Towler
PURPOSE OF REVIEW: Cardiometabolic diseases increasingly afflict our aging, dysmetabolic population. Complex signals regulating low-density lipoprotein receptor-related protein (LRP) and frizzled protein family members - the plasma membrane receptors for the cadre of Wnt polypeptide morphogens - contribute to the control of cardiovascular homeostasis. RECENT FINDINGS: Both canonical (β-catenin-dependent) and noncanonical (β-catenin-independent) Wnt signaling programs control vascular smooth muscle (VSM) cell phenotypic modulation in cardiometabolic disease...
July 18, 2017: Current Opinion in Lipidology
https://www.readbyqxmd.com/read/28720797/commensal-gut-microbiota-immunomodulatory-actions-in-bone-marrow-and-liver-have-catabolic-effects-on-skeletal-homeostasis-in-health
#5
Chad M Novince, Carolyn R Whittow, Johannes D Aartun, Jessica D Hathaway, Nicole Poulides, Michael B Chavez, Heidi M Steinkamp, Kaeleigh A Kirkwood, Emily Huang, Caroline Westwater, Keith L Kirkwood
Despite knowledge the gut microbiota regulates bone mass, mechanisms governing the normal gut microbiota's osteoimmunomodulatory effects on skeletal remodeling and homeostasis are unclear in the healthy adult skeleton. Young adult specific-pathogen-free and germ-free mice were used to delineate the commensal microbiota's immunoregulatory effects on osteoblastogenesis, osteoclastogenesis, marrow T-cell hematopoiesis, and extra-skeletal endocrine organ function. We report the commensal microbiota has anti-anabolic effects suppressing osteoblastogenesis and pro-catabolic effects enhancing osteoclastogenesis, which drive bone loss in health...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28720305/ecto-5-nucleotidase-cd73-regulates-bone-formation-and-remodeling-during-intramembranous-bone-repair-in-aging-mice
#6
Vivian Bradaschia-Correa, Anne M Josephson, Alexander J Egol, Matthew M Mizrahi, Kevin Leclerc, Jason Huo, Bruce N Cronstein, Philipp Leucht
Ecto-5'-nucleotidase (CD73) generates adenosine, an osteoblast activator and key regulator of skeletal growth. It is unknown, however, if CD73 regulates osteogenic differentiation during fracture healing in adulthood, and in particular how CD73 activity regulates intramembranous bone repair in the elderly. Monocortical tibial defects were created in 46-52-week-old wild type (WT) and CD73 knock-out mice (CD73(-/-)) mice. Injury repair was analyzed at post-operative days 5, 7, 14 and 21 by micro-computed tomography (micro-CT), histomorphometry, proliferating cell nuclear antigen (PCNA) immunostaining, alkaline phosphatase (ALP) and tartrate-resistant acid phosphatase (TRAP) histochemistry...
July 4, 2017: Tissue & Cell
https://www.readbyqxmd.com/read/28719612/renal-osteodystrophy-in-the-obesity-era-is-metabolic-syndrome-relevant
#7
Janaina Da Silva Martins, João Henrique Castro, Nestor A Sainz Rueda, Luciene Machado Dos Reis, Vanda Jorgetti, Rosa Maria Affonso Moysés, Jacqueline Teixeira Caramori
BACKGROUND: Observational studies have shown a beneficial effect of obesity on bone health; however, most of those studies were not based on bone biopsies. Metabolic syndrome (MetS) could have an effect on bone remodeling. However, there are no data on the effects of MetS in the presence of renal osteodystrophy. OBJECTIVE: The aim of this study was to investigate associations between MetS and renal osteodystrophy using the bone histomorphometric turnover-mineralization-volume (TMV) classification...
2017: PloS One
https://www.readbyqxmd.com/read/28719570/immediate-versus-delayed-loading-of-postextraction-implants-a-long-term-retrospective-cohort-study
#8
Tiziano Testori, Silvio Taschieri, Fabio Scutellà, Massimo Del Fabbro
PURPOSE: To compare the long-term clinical and radiographic outcomes between immediate loading (IL) and conventional loading of implants placed immediately in fresh extraction sockets. MATERIALS AND METHODS: Demographic data, implant details, and periapical radiographs of patients were collected. The long-term marginal bone level remodeling and implant survival rate were calculated. RESULTS: Twenty-one patients (mean age 52.55 ± 14.61 years) with 35 implants immediately inserted into postextraction sites (22 immediate loaded and 13 delayed loaded) were analyzed...
July 17, 2017: Implant Dentistry
https://www.readbyqxmd.com/read/28718064/contribution-of-circulatory-disturbances-in-subchondral-bone-to-the-pathophysiology-of-osteoarthritis
#9
REVIEW
Roy K Aaron, Jennifer Racine, Jonathan P Dyke
PURPOSE OF REVIEW: This review describes the contributions of abnormal bone circulation to the pathophysiology of osteoarthritis. Combining dynamic imaging with MRI and PET with previous observations reveals that venous stasis and a venous outlet syndrome is most likely the key circulatory pathology associated with the initiation or progression of osteoarthritis. RECENT FINDINGS: MRI and PET have revealed that venous outflow obstruction results in physicochemical changes in subchondral bone to which osteoblasts are responsive...
August 2017: Current Rheumatology Reports
https://www.readbyqxmd.com/read/28718007/-basic-principles-of-fracture-healing
#10
REVIEW
Valentin Rausch, Dominik Seybold, Matthias Königshausen, Manfred Köller, Thomas A Schildhauer, Jan Geßmann
BACKGROUND: In contrast to other tissues, bone has the remarkable ability to heal without scarring. After union of the fracture, the remodeled bone ideally does not differ from the original bone, especially in terms of biomechanical properties. The healing of a fracture resembles the embryonic development of bone. Depending on the biomechanical properties of the fracture, bone heals directly or indirectly, which refers to the formation of cartilage as a step before new bone appears...
July 17, 2017: Der Orthopäde
https://www.readbyqxmd.com/read/28717790/soft-and-hard-tissue-response-%C3%A2-to-an-implant-with-a-convergent-%C3%A2-collar-in-the-esthetic-area-%C3%A2-preliminary-report-at-18-months
#11
Luigi Canullo, Marco Tallarico, Guillermo Pradies, Fabio Marinotti, Ignazio Loi, Roberto Cocchetto
AIM: The purpose of this prospective cohort study was to investigate, over an 18-month period, soft and hard tissue response to a transmucosal implant with a convergent collar inserted in the anterior maxillary esthetic area. MATERIALS AND METHODS: From June 2013 to January 2014, 14 consecutive patients were enrolled (7 men and 7 women; mean age 63.7 ± 14 years) with 20 implants, needing at least one implant-supported restoration between the canines in the maxillary anterior esthetic area...
2017: International Journal of Esthetic Dentistry
https://www.readbyqxmd.com/read/28715414/kinesin-1-promotes-chondrocyte-maintenance-during-skeletal-morphogenesis
#12
Adrian Santos-Ledo, Marina Garcia-Macia, Philip D Campbell, Marta Gronska, Florence L Marlow
During skeletal morphogenesis diverse mechanisms are used to support bone formation. This can be seen in the bones that require a cartilage template for their development. In mammals the cartilage template is removed, but in zebrafish the cartilage template persists and the bone mineralizes around the cartilage scaffold. Remodeling of unmineralized cartilage occurs via planar cell polarity (PCP) mediated cell rearrangements that contribute to lengthening of elements; however, the mechanisms that maintain the chondrocyte template that supports perichondral ossification remain unclear...
July 17, 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28714404/current-and-emerging-strategies-in-osteoporosis-management
#13
Stefka Ivanova, Liliya Vasileva
The abnormal loss of bone tissue is defined as osteoporosis. Increased risk of fractures, low bone mineral density (BMD) and loss of the structural and biomechanical properties of the bone tissue characterize this pathological condition. Physiologically bone undergoes a continuous remodeling process involving balance between the activity of osteoblast and osteoclast. Disruption in this balanced condition increases the risk of osteoporosis. Both sexes are affected, but with higher prevalence in women after menopause...
July 14, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28714177/curved-microstructures-promote-osteogenesis-of-mesenchymal-stem-cells-via-the-rhoa-rock-pathway
#14
Qi Zhang, Shiyu Lin, Tao Zhang, Taoran Tian, Quanquan Ma, Xueping Xie, Changyue Xue, Yunfeng Lin, Bofeng Zhu, Xiaoxiao Cai
OBJECTIVES: Cells in the osteon reside in a curved space, accordingly, the curvature of the microenvironment is an important geometric feature in bone formation. However, it is not clear how curved microstructures affect cellular behaviour in bone tissue. MATERIALS AND METHODS: Rat primary bone marrow mesenchymal stem cells (BMSCs) on wavy microgrooves were exposed to PDMS substrates with various curvatures to investigate alterations in cellular morphology and osteogenic differentiation...
August 2017: Cell Proliferation
https://www.readbyqxmd.com/read/28713746/unicoronal-craniosynostosis-and-plagiocephaly-correction-with-fronto-orbital-bone-remodeling-and-advancement
#15
S M Balaji
The standard surgical treatment for unilateral coronal synostosis is fronoto-orbital advancement. The technique is known for its high recurrence rate and established plagiocephaly remains a challenge. In this case report, the management of a 5-year-old with unicoronal plagiocephaly correction with fronto-orbital bone remodeling and advancement is presented. The previous surgery done at 6 months of age resulted in failure with establishment of hypertelorism and sudden progressive diminishing vision. Furthermore, temporal hallowing was evident in the imaging technique...
January 2017: Annals of Maxillofacial Surgery
https://www.readbyqxmd.com/read/28713366/intratumoral-lentivector-mediated-tgf-%C3%AE-1-gene-downregulation-as-a-potent-strategy-for-enhancing-the-antitumor-effect-of-therapy-composed-of-cyclophosphamide-and-dendritic-cells
#16
Joanna Rossowska, Natalia Anger, Agnieszka Szczygieł, Jagoda Mierzejewska, Elżbieta Pajtasz-Piasecka
Vaccination with dendritic cells (DCs) stimulated with tumor antigens can induce specific cellular immune response that recognizes a high spectrum of tumor antigens. However, the ability of cancer cells to produce immunosuppressive factors drastically decreases the antitumor activity of DCs. The main purpose of the study was to improve the effectiveness of DC-based immunotherapy or chemoimmunotherapy composed of cyclophosphamide (CY) and DCs by application of lentivectors (LVs)-encoding short hairpin RNA specific for TGF-β1 (shTGFβ1 LVs)...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28713118/preserving-the-bone-profile-in-anterior-maxilla-using-an-equine-cortical-bone-membrane-and-an-equine-enzyme-treated-bone-graft-a-case-report-with-5-year-follow-up
#17
Danilo A Di Stefano, Umberto Garagiola, Mirko A Bassi
AIM: This study aimed to report a well-succeeded use of equine enzyme-deantigenic cortical membrane and bone granules for guided bone regeneration (GBR) in the esthetic zone concomitant with implant placement. BACKGROUND: In the anterior maxilla, where patients typically have the highest expectations for implant-supported restorations, bone resorption in the wake of tooth loss often leads to a lack of soft tissue support and ultimately to unsatisfactory esthetic results...
July 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28712852/osteonecrosis-of-the-jaws-a-review-and-update-in-etiology-and-treatment
#18
Guilherme H Ribeiro, Emanuely S Chrun, Kamile L Dutra, Filipe I Daniel, Liliane J Grando
INTRODUCTION: Osteonecrosis of the jaws can result either from radiation, used in radiotherapy for treatment of malignant tumors, or medications used for bone remodeling and anti-angiogenesis such as bisphosphonates. These conditions can be associated with triggering factors such as infection, trauma and decreased vascularity. The management of patients with osteonecrosis of the jaws requires caution since there is no specific treatment that acts isolated and decidedly. However, different treatment modalities can be employed in an associated manner to control and stabilize lesions...
June 24, 2017: Brazilian Journal of Otorhinolaryngology
https://www.readbyqxmd.com/read/28712382/design-and-fabrication-of-a-three-dimensional-in-vitro-system-for-modeling-vascular-stenosis
#19
Rebecca S Jones, Pin H Chang, Tzlil Perahia, Katrina A Harmon, Lorain Junor, Michael J Yost, Daping Fan, John F Eberth, Richard L Goodwin
Vascular stenosis, the abnormal narrowing of blood vessels, arises from defective developmental processes or atherosclerosis-related adult pathologies. Stenosis triggers a series of adaptive cellular responses that induces adverse remodeling, which can progress to partial or complete vessel occlusion with numerous fatal outcomes. Despite its severity, the cellular interactions and biophysical cues that regulate this pathological progression are poorly understood. Here, we report the design and fabrication of a three-dimensional (3D) in vitro system to model vascular stenosis so that specific cellular interactions and responses to hemodynamic stimuli can be investigated...
July 17, 2017: Microscopy and Microanalysis
https://www.readbyqxmd.com/read/28711163/effects-of-the-basic-multicellular-unit-and-lamellar-thickness-on-osteonal-fatigue-life
#20
George Pellegrino, Max Roman, J Christopher Fritton
A remodeling cycle sets the size of the osteon and associated lamellae in the basic multicellular unit. Treatments and aging affect these micro-structural features. We previously demonstrated decreased fatigue life with an unexplained mechanism and decreased osteon size in cortical bone treated with high-dose bisphosphonate. Here, three finite element models were examined: type-1: a single osteon, as a homogeneous unit and with heterogeneous lamellae and interlamellae, type-2: a control, interstitial-only tissue and type-3: the osteon with cement line, set within the interstitial tissue...
June 23, 2017: Journal of Biomechanics
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