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cancellous bone

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https://www.readbyqxmd.com/read/28454328/reconstruction-of-mandibular-defects-with-autogenous-bone-and-decellularized-bovine-bone-grafts-with-freeze-dried-bone-marrow-stem-cell-paracrine-factors
#1
Ann Kakabadze, Konstantine Mardaleishvili, George Loladze, Lia Karalashvili, Gocha Chutkerashvili, David Chakhunashvili, Zurab Kakabadze
The gold standard following segmental mandibulectomy is vascularized autologous bone graft in the form of the fibula flap. However, in bone reconstruction the use of autogenous bone does not always guarantee a successful outcome. The aim of the present investigation was to develop a novel biologically active bone (BAB) graft, and to use it for the reconstruction of large size defects of the mandible bone following tumor resection. In the first part of the present study, biologically active bone graft was developed by using human freeze-dried bone marrow stem cells (BMSCs) paracrine factors and three-dimensional bone scaffold derived from cancellous bovine bone following decellularization...
March 2017: Oncology Letters
https://www.readbyqxmd.com/read/28448921/novel-bone-surrogates-for-cranial-surgery-training
#2
Marianne Hollensteiner, David Fürst, Benjamin Esterer, Peter Augat, Falk Schrödl, Stefan Hunger, Michael Malek, Daniel Stephan, Andreas Schrempf
Parietal graft lifts are trained on human or animal specimens or are directly performed on patients without extensive training. In order to prevent harm to the patient resulting from fast rotating machinery tools, the surgeon needs to apply appropriate forces. Realistic haptics are essential to identify the varying parietal bone layers and to avoid a penetration of the brain. This however, requires experience and training. Therefore, in this study, bone surrogate materials were evaluated with the aim to provide an anatomically correct artificial skull cap with realistic haptic feedback for graft lift training procedures...
April 19, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28444839/age-dependent-alterations-in-osteoblast-and-osteoclast-activity-in-human-cancellous-bone
#3
Mustafa Becerikli, Henriette Jaurich, Jessica Schira, Matthias Schulte, Carmen Döbele, Christoph Wallner, Stephanie Abraham, Johannes M Wagner, Mehran Dadras, Ulrich Kneser, Marcus Lehnhardt, Björn Behr
It is assumed that the activity of osteoblasts and osteoclasts is decreased in bone tissue of aged individuals. However, detailed investigation of the molecular signature of human bone from young compared to aged individuals confirming this assumption is lacking. In this study, quantitative expression analysis of genes related to osteogenesis and osteoclastogenesis of human cancellous bone derived from the distal radius of young and aged individuals was performed. Furthermore, we additionally performed immunohistochemical stainings...
April 26, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28444407/-aseptic-loosening-of-total-ankle-replacement-and-conversion-to-ankle-arthrodesis
#4
M D Wimmer, M Hettchen, M M Ploeger, B Hintermann, D C Wirtz, A Barg
OBJECTIVE: To remove loosened prosthesis components, to perform augmentation, to address osseous defects, to perform neutrally aligned ankle arthrodesis, and to achieve postoperative pain relief. INDICATIONS: Symptomatic, aseptic loosening of total ankle replacement (TAR) with/without substantial bone defect of the tibial and/or talar bone stock. CONTRAINDICATIONS: General surgical or anesthesiological risks, periprosthetic infection, local or systemic infection, nonmanageable soft tissue problems...
April 25, 2017: Operative Orthopädie und Traumatologie
https://www.readbyqxmd.com/read/28443251/partial-heel-pad-avulsion-with-open-calcaneal-tuberosity-fracture-with-tendo-achilles-rupture-a-case-report
#5
Shameem Ahmed, Syed Ifthekar, R Pathan Rameez Ahmed Khan, Rahul Ranjan
INTRODUCTION: The management of heel pad avulsion injuries has been challenging because of the precarious blood supply. The difficulties get compounded when it is associated with tendo-achilles rupture and calcaneal fracture. Here, it is a description of a case with the above features managed with a unique technique. CASE REPORT: A 63-year-old woman presented to casualty with injury to right ankle after a road traffic accident. On clinical and radiological examination, there was avulsion of heel pad with calcaneal tuberosity fracture and tendo-achilles rupture...
September 2016: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/28428919/tibial-bone-grafting-for-wrist-reconstruction
#6
Schneider K Rancy, Stephanie D Malliaris, Scott W Wolfe
Background Iliac crest bone graft harvesting is routinely performed for upper extremity orthopedic procedures despite high complication rates associated with sensory nerve injury, hematoma, chronic pain, and fracture. Description of Technique Cancellous bone graft is harvested from the proximal tibia using a medial approach, minimizing donor site morbidity. Patients and Methods A retrospective review was undertaken of 14 patients who underwent cancellous proximal tibia bone graft harvesting to augment healing of wrist reconstruction, with 2 months minimum follow-up...
May 2017: Journal of Wrist Surgery
https://www.readbyqxmd.com/read/28428364/role-of-oestrogen-receptor-signaling-in-skeletal-response-to-leptin-in-female-ob-ob-mice
#7
Russell T Turner, Kenneth A Philbrick, Amida Kuah, Adam J Branscum, Urszula T Iwaniec
Leptin, critical in regulation of energy metabolism, is also important for normal bone growth, maturation and turnover. Compared to wild type (WT) mice, bone mass is lower in leptin-deficient ob/ob mice; osteopenia in growing ob/ob mice is due to decreased bone accrual, and is associated with reduced longitudinal bone growth, impaired cancellous bone maturation and increased marrow adipose tissue (MAT). However, leptin deficiency also results in gonadal dysfunction, disrupting production of gonadal hormones which regulate bone growth and turnover...
April 20, 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/28428078/kinetic-reconstruction-reveals-time-dependent-effects-of-romosozumab-on-bone-formation-and-osteoblast-function-in-vertebral-cancellous-and-cortical-bone-in-cynomolgus-monkeys
#8
Rogely Waite Boyce, Qing-Tian Niu, Michael S Ominsky
Romosozumab, a humanized monoclonal sclerostin antibody under development for the treatment of osteoporosis, has a unique mechanism of action on bone-increasing bone formation and decreasing bone resorption. The effects on bone formation are transient, eliciting a rapid increase in bone formation that attenuates with continued treatment. Although bone formation attenuates, bone mineral density (BMD) continues to increase. To explore potential tissue-level mechanisms that could contribute to a progressive increase in spine BMD, we used kinetic reconstruction techniques to examine the effects of romosozumab on modeling and remodeling units in vertebral cancellous bone from adult cynomolgus monkeys administered romosozumab for 10 and 28weeks...
April 18, 2017: Bone
https://www.readbyqxmd.com/read/28421607/laterality-and-grip-strength-influence-hand-bone-micro-architecture-in-modern-humans-an-hrpqct-study
#9
Nicolas Reina, Etienne Cavaignac, William H Trousdale, Jean-Michel Laffosse, José Braga
It is widely hypothesized that mechanical loading, specifically repetitive low-intensity tasks, influences the inner structure of cancellous bone. As such, there is likely a relationship between handedness and bone morphology. The aim of this study is to determine patterns in trabecular bone between dominant and non-dominant hands in modern humans. Seventeen healthy patients between 22 and 32 years old were included in the study. Radial carpal bones (lunate, capitate, scaphoid, trapezium, trapezoid, 1st, 2nd and 3rd metacarpals) were analyzed with high-resolution micro-computed tomography...
April 19, 2017: Journal of Anatomy
https://www.readbyqxmd.com/read/28415487/simultaneous-formation-and-mineralization-of-star-p-eo-stat-po-hydrogels
#10
Martha Schamel, Jürgen Groll, Uwe Gbureck
Natural bone is an organic-inorganic composite of highly ordered collagen fibrils and ~60-70% nanocrystalline hydroxyapatite (HA) crystals resulting in a high fracture resistance for various mechanical loading situations. This study aimed to synthesize highly mineralized hydrogels to mimic the mechanical properties of cancellous bone. A six armed star molecule functionalized with isocyanate groups as reactive termini (NCO-sP(EO-stat-PO)) was used to build up a hydrogel matrix, which was then subsequently mineralized with hydroxyapatite nanocrystals following the hydrolysis of incorporated α-tricalcium phosphate particles...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415416/in-vitro-and-in-vivo-corrosion-mechanical-properties-and-biocompatibility-evaluation-of-mgf2-coated-mg-zn-zr-alloy-as-cancellous-screws
#11
Zhen Li, Sun Shizhao, Minfang Chen, Bradley Dean Fahlman, Debao Liu, Hongwei Bi
Magnesium (Mg) and its alloys as biodegradable materials have received much attention in the orthopedics applications; however, the corrosion behavior of these metals in vivo remains challenging. In this work, a dense and nanoscale magnesium fluoride (MgF2) coating was deposited on the surface of Mg-Zn-Zr (MZZ) alloy cancellous screw. The MZZ cancellous screw with MgF2 coating maintained an integrated shape and high yield tensile stress after 30days immersion in SBF, comparing with the bare screw. Hydrogen releasing rate of the MZZ samples was suppressed at a lower level at the initial stage, which is in favour of the adhesion of the cells...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415391/biological-activity-evaluation-of-magnesium-fluoride-coated-mg-zn-zr-alloy-in-vivo
#12
Hongfeng Jiang, Jingbo Wang, Minfang Chen, Debao Liu
AIM: To explore the biodegradable characteristics and biological properties, which could promote new bone formation, of MgF2 coated magnesium alloy (Mg-3wt%Zn-0.5wt%Zr) in rabbits. METHODS: Magnesium alloy with MgF2 coating was made and the MgF2/Mg-Zn-Zr was implanted in the femoral condyle of rabbits. Twelve healthy adult Japanese white rabbits in weight of 2.8-3.2kg were averagely divided into A(Mg-Zn-Zr) group and B(MgF2/MgZn-Zr) group. Indexes such as microstructural evolution, SEM scan, X-ray, Micro-CT and mechanical properties were observed and detected at 1th day, 2th, 4th, 8th, 12th, 24th week after implantation...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28414141/temporal-role-of-macrophages-in-cancellous-bone-healing
#13
Olof Helge Sandberg, Love Tätting, Magnus Erik Bernhardsson, Per Aspenberg
Macrophages are important phagocytosing and cytokine producing cells with effects on fracture healing. We used clodronate-containing liposomes to reduce the number of macrophages, in order to study their role in the early phases of cancellous bone healing. Holes were drilled bilaterally into the cancellous bone of the proximal metaphysis of the tibia of 60 mice. A screw was inserted in the hole in the right tibia. The day of surgery was day 0. Clodronate-containing liposomes were injected intraperitoneally as a single injection either day -4 or -1 (before surgery) or day 1 or 3 (after surgery)...
April 14, 2017: Bone
https://www.readbyqxmd.com/read/28407060/role-of-osteoblast-gi-signaling-in-age-related-bone-loss-in-female-mice
#14
Susan M Millard, Liping Wang, Lalita Wattanachanya, Dylan O'Carroll, Aaron J Fields, Joyce Pang, Galateia Kazakia, Jeffrey C Lotz, Robert A Nissenson
Age-related bone loss is an important risk factor for fractures in the elderly, resulting from an imbalance in bone remodeling mainly due to decreased bone formation. We have previously demonstrated that endogenous G protein coupled receptor (GPCR)-driven Gi signaling in osteoblasts (Obs) restrains bone formation in mice during growth. Here, we launched a longitudinal study to test the hypothesis that Gi signaling in Obs restrains bone formation in aging mice, thereby promoting bone loss. Our approach was to block Gi signaling in maturing Obs by the induced expression of the catalytic subunit of pertussis toxin (PTX) after the achievement of peak bone mass...
April 12, 2017: Endocrinology
https://www.readbyqxmd.com/read/28405613/rip140-in-monocytes-macrophages-regulates-osteoclast-differentiation-and-bone-homeostasis
#15
Bomi Lee, Urszula T Iwaniec, Russell T Turner, Yi-Wei Lin, Bart L Clarke, Anne Gingery, Li-Na Wei
Osteolytic bone diseases, such as osteoporosis, are characterized by diminished bone quality and increased fracture risk. The therapeutic challenge remains to maintain bone homeostasis with a balance between osteoclast-mediated resorption and osteoblast-mediated formation. Osteoclasts are formed by the fusion of monocyte/macrophage-derived precursors. Here we report, to our knowledge for the first time, that receptor-interacting protein 140 (RIP140) expression in osteoclast precursors and its protein regulation are crucial for osteoclast differentiation, activity, and coupled bone formation...
April 6, 2017: JCI Insight
https://www.readbyqxmd.com/read/28402337/bone-marrow-adipose-tissue-deficiency-increases-disuse-induced-bone-loss-in-male-mice
#16
Jessica A Keune, Carmen P Wong, Adam J Branscum, Urszula T Iwaniec, Russell T Turner
Bone marrow adipose tissue (MAT) is negatively associated with bone mass. Since osteoblasts and adipocytes are derived from the same precursor cells, adipocyte differentiation may occur at the expense of osteoblast differentiation. We used MAT-deficient Kit(W/W-v) (MAT-) mice to determine if absence of MAT reduced bone loss in hindlimb-unloaded (HU) mice. Male MAT- and wild-type (WT) mice were randomly assigned to a baseline, control or HU group (n = 10 mice/group) within each genotype and HU groups unloaded for 2 weeks...
April 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28401250/-skeletal-hemangiomas
#17
M Rickert, A Meurer
Hemangiomas are benign tumors, which are mainly composed of neoplastic blood vessels. The exact pathogenesis is still unclear. They are the most common benign spinal tumors and also occur less commonly in the bones of the extremities. Hemangiomas are often clinically asymptomatic and are diagnosed as incidental findings. Women are affected more frequently than men (2:1). The X‑ray and computed tomography (CT) diagnostics typically demonstrate the classical honeycombing or vertically orientated lucencies separated by thickened cancellous bone in the affected skeletal section...
April 11, 2017: Der Orthopäde
https://www.readbyqxmd.com/read/28401159/management-of-hepple-stage-v-osteochondral-lesion-of-the-talus-with-a-platelet-rich-plasma-scaffold
#18
Wenqi Gu, Tanzhu Li, Zhongmin Shi, Guohua Mei, Jianfeng Xue, Jian Zou, Xiaokang Wang, Haotong Zhang, Hongwei Xu
There has been no consensus on the treatment or prognosis of Hepple stage V osteochondral lesions of the talus (OLTs), especially for lesions greater than 1.5 cm(2) in size. The objective of this study was to investigate the clinical outcomes achieved upon application of a platelet-rich plasma (PRP) scaffold with a cancellous bone autograft for Hepple stage V OLTs. Fourteen patients (mean age, 39 years) were treated with a cancellous bone graft and a PRP scaffold between 2013 and 2015. The mean time to surgical treatment was 23...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28399079/-the-mathematical-modeling-of-the-injurious-impact-on-the-tibial-bone-for-the-evaluation-of-the-conditions-leading-to-its-fracture
#19
S V Leonov, P V Pinchuk, K N Krupin, D A Panfilov
We have undertaken the mathematical modeling of the process associated with the destruction of the diaphyseal and proximal epiphyseal parts of the tibial bone by means of the finite element analysis. The main emphasis was laid on the elucidation of the topography of force stresses in the model bone. It was shown that loading the upper third of the bone either along its axis or perpendicular to the surface (i.e. in the region formed largely by the cancellous tissue) results in the depressed fracture at the site of the impact...
2017: Sudebno-meditsinskaia Ekspertiza
https://www.readbyqxmd.com/read/28397554/sauv%C3%A3-kapandji-procedure-with-headless-compression-screw-in-patients-with-rheumatoid-arthritis
#20
Atsushi Maeda, Taku Suzuki, Masaki Hasegawa, Takashi Kuroiwa, Kanae Shizu, Katsuhiko Hayakawa, Takashi Tsuji, Katsuji Suzuki, Harumoto Yamada
OBJECTIVE: We examined the surgical outcomes of the Sauvé-Kapandji (S-K) procedure using a headless compression screw and a metal cancellous screw in patients with rheumatoid arthritis (RA). METHODS: This retrospective study included 41 RA patients who underwent the S-K procedure for distal radioulnar joint disorders with two screws: headless compression screws (HCS group, n = 20) and cannulated cancellous screws (CCS group, n = 21). Clinical and radiographic outcomes were assessed 1 year after surgery...
April 11, 2017: Modern Rheumatology
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