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Fracture + remodeling

Wei Wei, Biao-Fang Wei, Jian Cai, Wei He, Lin Wan, Ying Guan
OBJECTIVE: The aim of the study was to explore the efficacy of Fu-Yuan Capsule in the healing of fractures of the lower end of the radius in a rabbit model. METHODS: After establishing a rabbit fracture model, all animals were randomly divided into the model group (n = 24), the Fu-Yuan Capsule group (n = 24), and the Shenyang Hongyao group (n = 24). The X-ray was applied to observe the course of fracture healing at 2, 4, 6, and 8 weeks after treatment. Haematoxylin-eosin staining and immunohistochemical staining were used to determine the histological change and the expression of bone morphogenetic protein-2 (BMP-2)...
October 14, 2016: Pharmacology
Åshild Bjørnerem, Ali Ghasem-Zadeh, Xiaofang Wang, Minh Bui, Susan P Walker, Roger Zebaze, Ego Seeman
Estrogen deficiency associated with menopause is accompanied by an increase in the rate of bone remodeling and the appearance of a remodeling imbalance; each of the greater number of remodeling transactions deposits less bone than was resorbed resulting in microstructural deterioration. The newly deposited bone is also less completely mineralized than the older bone resorbed. We examined whether breastfeeding, an estrogen deficient state, compromises bone microstructure and matrix mineral density. Distal tibial and distal radial microarchitecture were quantified using high-resolution peripheral quantitative computed tomography in 58 women prior, during and after breastfeeding, and in 48 controls during one to five years follow-up...
October 13, 2016: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
Tao Wang, Xinping Zhang, Daniel D Bikle
5-10% of fractures fail to heal normally leading to additional surgery, morbidity, and altered quality of life. Fracture healing involves the coordinated action of stem cells primarily coming from the periosteum which differentiate into the chondrocytes and osteoblasts, forming first the soft (cartilage) callus followed by the hard (bone) callus. These stem cells are accompanied by a vascular invasion that appears critical for the differentiation process and which may enable the entry of osteoclasts necessary for the remodeling of the callus into mature bone...
October 12, 2016: Journal of Cellular Physiology
Devyani Misra, Christine Peloquin, Douglas P Kiel, Tuhina Neogi, Na Lu, Yuqing Zhang
PURPOSE: Nitrates, commonly used anti-anginal medications, also have beneficial effect on bone remodeling and bone density, particularly with intermittent use. However, their effect on fracture risk is not clear. We examined the relation of short-acting nitrate use (proxy for intermittent use) to the risk of hip fracture in a large cohort of older adults with ischemic heart disease. MATERIALS AND METHODS: Participants ≥ 60 years old with ischemic heart disease and without history of hip fracture from The Health Improvement Network (THIN), an electronic medical records database in the UK, were included...
October 6, 2016: American Journal of Medicine
E Terpos, D Christoulas, E Kastritis, T Bagratuni, M Gavriatopoulou, M Roussou, A Papatheodorou, E Eleutherakis-Papaiakovou, N Kanellias, C Liakou, I Panagiotidis, M Migkou, P Kokkoris, L A Moulopoulos, M A Dimopoulos
Periostin is an extracellular matrix protein that is implicated in the biology of normal bone remodeling and in different cancer cell growth and metastasis. However, there is no information on the role of periostin in multiple myeloma (MM). Thus, we evaluated periostin in six myeloma cell lines in vitro; in the bone marrow plasma and serum of 105 newly diagnosed symptomatic MM (NDMM) patients and in the serum of 23 monoclonal gammopathy of undetermined significance (MGUS), 33 smoldering MM (SMM) patients, 30 patients at the plateau phase post-first-line therapy, 30 patients at first relapse and 30 healthy controls...
October 7, 2016: Blood Cancer Journal
Laisa Socorro Briongos-Figuero, Francisca Cuadrado-Medina, Laura Abad-Manteca, Gemma Vega-Tejedor, Mónica Pineda-Alonso, José Luis Pérez-Castrillón
OBJECTIVE: Angiotensin-converting enzyme (ACE) has been related to cardiovascular physiology and bone remodeling. Our aim was to assess the relationship among ACE polymorphisms, cardiovascular risk, and osteoporotic fractures. MATERIAL AND METHODS: We prospectively enrolled 71 patients with hypertension from 2001 to 2014. Sociodemographic and medical data were collected. Comorbidity was evaluated with Charlson index. Densitometric studies on lumbar spine were performed...
March 2016: Eur J Rheumatol
Evangelia Kalaitzoglou, Iuliana Popescu, R Clay Bunn, John L Fowlkes, Kathryn M Thrailkill
PURPOSE OF REVIEW: To describe the effects of type 1 diabetes on bone cells. RECENT FINDINGS: Type 1 diabetes (T1D) is associated with low bone mineral density, increased risk of fractures, and poor fracture healing. Its effects on the skeleton were primarily attributed to impaired bone formation, but recent data suggests that bone remodeling and resorption are also compromised. The hyperglycemic and inflammatory environment associated with T1D impacts osteoblasts, osteocytes, and osteoclasts...
October 4, 2016: Current Osteoporosis Reports
Chin-Wei Jeff Wang, Laurie K McCauley
Osteoporosis and periodontitis are both diseases characterized by bone resorption. Osteoporosis features systemic degenerative bone loss that leads to loss of skeletal cancellous microstructure and subsequent fracture, whereas periodontitis involves local inflammatory bone loss, following an infectious breach of the alveolar cortical bone, and it may result in tooth loss. Most cross-sectional studies have confirmed the association of osteoporosis and periodontitis primarily on radiographic measurements and to a lesser degree on clinical parameters...
September 30, 2016: Current Osteoporosis Reports
Homare Eda, Loredana Santo, G David Roodman, Noopur Raje
Bone involvement represented by osteolytic bone disease (OBD) or osteopenia is one of the pathognomonic and defining characteristics of multiple myeloma (MM). Nearly 90 % of patients with MM develop osteolytic bone lesions, frequently complicated by skeletal-related events (SRE) such as severe bone pain, pathological fractures, vertebral collapse, hypercalcemia, and spinal cord compression. All of these not only result in a negative impact on quality of life but also adversely impact overall survival. OBD is a consequence of increased osteoclast (OC) activation along with osteoblast (OB) inhibition, resulting in altered bone remodeling...
2016: Cancer Treatment and Research
J-J Sinikumpu, S Victorzon, T Pokka, E-L Lindholm, T Peljo, W Serlo
AIMS: We present the clinical and radiographic outcome of 81 children with Gartland type I to III supracondylar humeral fractures at a minimum follow-up of ten years (mean 12.1 years; 10.3 to 16.1) following injury. PATIENTS AND METHODS: The clinical and functional outcomes are compared with normal age- and gender-matched individuals. The population-based study setting was first identified from the institutional registries; the rate of participation was 76%. Controls were randomly selected from Finnish National Population Registry...
October 2016: Bone & Joint Journal
Christoph Riedel, Elizabeth A Zimmermann, Jozef Zustin, Manfred Niecke, Michael Amling, Marc Grynpas, Björn Busse
Strontium ranelate and fluoride salts are therapeutic options to reduce fracture risk in osteoporosis. Incorporation of these elements in the physiological hydroxyapatite matrix of bone is accompanied by changes in bone remodeling, composition, and structure. However, a direct comparison of the effectiveness of strontium and fluoride treatment in human cortical bone with a focus on the resulting mechanical properties remains to be established. Study groups are composed of undecalcified specimens from healthy controls, treatment-naïve osteoporosis cases, and strontium ranelate or fluoride-treated osteoporosis cases...
September 29, 2016: Journal of Biomedical Materials Research. Part A
Salvi Prat, Santiago Gallardo-Villares, Marian Vives, Ana Carreño, Marta Caminal, Irene Oliver-Vila, Daniel Chaverri, Margarita Blanco, Margarita Codinach, Pere Huguet, José Ramírez, Javier A Pinto, Màrius Aguirre, Ruth Coll, Joan Garcia-López, Fernando Granell-Escobar, Joaquim Vives
Pseudoarhtrosis is a relatively frequent complication of fractures, in which the lack of mechanical stability and biological stimuli results in the failure of bone union, most frequently in humerus and tibia. Treatment of recalcitrant pseudoarthrosis relies on the achievement of satisfactory mechanical stability combined with adequate local biology. Herein we present two cases of atrophic pseudoarthrosis that received a Tissue Engineering Product (TEP) composed of autologous Bone Marrow-derived Mesenchymal Stromal Cells (BM-MSC) combined with deantigenised trabecular bone particles from tissue bank...
September 29, 2016: Journal of Tissue Engineering and Regenerative Medicine
Nemandra A Sandiford, Donald S Garbuz, Bassam A Masri, Clive P Duncan
BACKGROUND: The ideal femoral component for revision THA is undecided. Cylindrical nonmodular stems have been associated with stress shielding, whereas junctional fractures have been reported with tapered fluted modular titanium stems. We have used a tapered fluted nonmodular titanium femoral component (Wagner Self-locking [SL] femoral stem) to mitigate this risk. This component has been used extensively in Europe by its designer surgeons, but to our knowledge, it has not been studied in North America...
September 26, 2016: Clinical Orthopaedics and related Research
Daisuke Tawara, Ken Nagura
Because changes in the mechanical properties of bone are closely related to trabecular bone remodeling, methods that consider the temporal morphological changes induced by adaptive remodeling of trabecular bone are needed to estimate long-term fracture risk and bone quality in osteoporosis. We simulated bone remodeling using simplified and pig trabecular bone models and estimated the morphology of healthy and osteoporotic cases. We then displayed the fracture risk of the remodeled models based on a cumulative histogram from high stress...
September 27, 2016: Computer Methods in Biomechanics and Biomedical Engineering
Seth Levy, Joseph M Feduska, Anandi Sawant, Shawn R Gilbert, Jonathan A Hensel, Selvarangan Ponnazhagan
Bone fractures heal with overlapping phases of inflammation, cell proliferation, and bone remodeling. Osteogenesis and angiogenesis work in concert to control many stages of this process, and when one is impaired it leads to failure of bone healing, termed a nonunion. During fracture repair, there is an infiltration of immune cells at the fracture site that not only mediate the inflammatory responses, but we hypothesize they also exert influence on neovasculature. Thus, further understanding the effects of immune cell participation throughout fracture healing will reveal additional knowledge as to why some fractures heal while others form nonunions, and lead to development of novel therapeutics modulating immune cells, to increase fracture healing and prevent nonunions...
September 21, 2016: Bone
Baptiste Pichon, Loïc Campion, Grégory Delpon, François Thillays, Christian Carrie, Patrice Cellier, Pascal Pommier, Cécile Laude, Augustin Mervoyer, Hadji Hamidou, Marc-André Mahé, Stéphane Supiot
INTRODUCTION: Hypofractionated stereotactic radiation therapy (HSRT) for vertebral metastases gives good results in terms of local control but increases the risk of fracture in the treated volume. Preclinical and clinical studies have shown that zoledronate not only reduces the risk of fracture and stimulates osteoclastic remodeling but also increases the immune response and radiosensitivity. This study aimed to evaluate the tolerability and effectiveness of zoledronate in association with radiation therapy...
July 30, 2016: International Journal of Radiation Oncology, Biology, Physics
Le T Duong, Randy Crawford, Kevin Scott, Christopher T Winkelmann, Gouxin Wu, Pete Szczerba, Michael A Gentile
Odanacatib (ODN) a selective and reversible cathepsin K inhibitor, inhibits bone resorption, increases bone mass and reduces fracture risk in women with osteoporosis. A 16-month (~7-remodeling cycles) study was carried out in treatment mode to assess the effects of ODN versus ALN on bone mass, remodeling status and biomechanical properties of lumbar vertebrae (LV) and femur in ovariectomized (OVX) rabbits. This study also evaluated the impact of discontinuing ODN on these parameters. Rabbits at 7.5months post-OVX were dosed for 16-months with ODN (7...
September 15, 2016: Bone
Lauren Roberts, Jason Strelzow, Emily K Schaeffer, Christopher W Reilly, Kishore Mulpuri
BACKGROUND: Although the recommended treatment for Gartland types I and III supracondylar humeral fractures is well-established, the optimal treatment for type II fractures without rotational malalignment remains controversial, involving circumferential casting or closed reduction and pinning. Our institution uses pronated flexion-taping for Gartland type IIA fractures. This theoretically removes external pressure secondary to circumferential casting, potentially decreasing risks of compartment syndrome and mitigating loss of reduction with extension while maintaining optimal flexion position for reduction...
September 15, 2016: Journal of Pediatric Orthopedics
Michael Fadell, Angie Miller, Laszlo Trefan, Jason Weinman, Jaime Stewart, Kari Hayes, Sabine Maguire
OBJECTIVES: Given the frequency of abusive fractures among infants, and the lack of research and or evidence for the phases of fracture healing seen in this age group, this study aims to describe a timetable of radiological features of fracture healing among infants in the first months of life. METHODS: We completed a retrospective cross-sectional time-series study of birth-related clavicle fractures from 2006-2013. A total of 108 digital images were available for review from 61 infants...
September 15, 2016: European Radiology
Dian-Qi Li, Qi-Long Wan, Janak L Pathak, Zu-Bing Li
Enhanced osteoclast formation increases bone resorption, which triggers bone remodeling. Platelet-derived growth factor BB (PDGF-BB) enhances precursor cell homing, angiogenesis, and bone healing, and thereby could also treat osteoporosis. However, the effect of PDGF-BB on osteoclast formation is not fully understood. We investigated whether exogenous recombinant PDGF-BB directly affects osteoclast formation and osteoclast precursor cell chemotaxis. The murine monocyte-macrophage cell line RAW264.7 and bone-marrow-derived macrophages were cultured with recombinant mouse PDGF-BB with or without a platelet-derived growth factor receptor β inhibitor (AG-1295) or a Janus kinase 2 inhibitor (AG-490) to analyze the effect on osteoclastogenesis in vitro...
September 14, 2016: Journal of Bone and Mineral Metabolism
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