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https://www.readbyqxmd.com/read/28782836/histone-deacetylase-3-deletion-in-mesenchymal-progenitor-cells-hinders-long-bone-development
#1
Marina Feigenson, Lomeli Carpio Shull, Earnest L Taylor, Emily T Camilleri, Scott M Reister, Andre J van Wijnen, Elizabeth W Bradley, Jennifer J Westendorf
Long bone formation is a complex process that requires precise transcriptional control of gene expression programs in mesenchymal progenitor cells. Histone deacetylases (Hdacs) coordinate chromatin structure and gene expression by enzymatically removing acetyl groups from histones and other proteins. Hdac inhibitors are used clinically to manage mood disorders, cancers and other conditions, but are teratogenic to the developing skeleton and increase fracture risk in adults. In this study, the functions of Hdac3, one of the enzymes blocked by current Hdac inhibitor therapies, in skeletal mesenchymal progenitor cells were determined...
August 7, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28774251/dorsal-and-volar-surgical-approaches-to-the-metacarpophalangeal-joint-a-comparative-anatomic-study
#2
Eitan Melamed, Nicholas Calotta, Ricardo Bello, Richard M Hinds, John T Capo, Scott Lifchez
BACKGROUND: We compared 3 surgical approaches to the MP joint: a dorsal extensor tendon-splitting approach, a dorsal extensor tendon-reflecting parasagittal approach, and the volar A1 pulley approach. We quantitatively compared each of these approaches by measuring the amount of articular cartilage exposed on the base of the proximal phalanx. We hypothesize that visualization of the articular cartilage of the proximal phalangeal base is enhanced with the volar approach. METHODS: The MP joints of the 32 available digits were randomly assigned to 1 of 3 surgical approaches: extensor tendon splitting (A), extensor tendon reflecting (B), or volar approach (C)...
September 2017: Journal of Hand Surgery Asian-Pacific Volume
https://www.readbyqxmd.com/read/28772395/customized-a-ti6al4v-bone-plate-for-complex-pelvic-fracture-by-selective-laser-melting
#3
Di Wang, Yimeng Wang, Shibiao Wu, Hui Lin, Yongqiang Yang, Shicai Fan, Cheng Gu, Jianhua Wang, Changhui Song
In pelvic fracture operations, bone plate shaping is challenging and the operation time is long. To address this issue, a customized bone plate was designed and produced using selective laser melting (SLM) technology. The key steps of this study included designing the customized bone plate, metal 3D printing, vacuum heat treatment, surface post-processing, operation rehearsal, and clinical application and evaluation. The joint surface of the bone plate was placed upwards with respect to the build platform to keep it away from the support and to improve the quality of the joint surface...
January 4, 2017: Materials
https://www.readbyqxmd.com/read/28772165/raman-spectral-markers-of-collagen-denaturation-and-hydration-in-human-cortical-bone-tissue-are-affected-by-radiation-sterilization-and-high-cycle-fatigue-damage
#4
Christopher D Flanagan, Mustafa Unal, Ozan Akkus, Clare M Rimnac
BACKGROUND: Thermal denaturation and monotonic mechanical damage alter the organic and water-related compartments of cortical bone. These changes can be detected using Raman spectroscopy. However, less is known regarding Raman sensitivity to detect the effects of cyclic fatigue damage and allograft sterilization doses of gamma radiation. OBJECTIVE: To determine if Raman spectroscopic biomarkers of collagen denaturation and hydration are sensitive to the effects of (a) high cycle fatigue damage and (b) 25kGy irradiation...
July 13, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28771086/exposure-to-low-dose-x-ray-radiation-alters-bone-progenitor-cells-and-bone-microarchitecture
#5
Florence Lima, Joshua M Swift, Elisabeth S Greene, Matthew R Allen, David A Cunningham, Leslie A Braby, Susan A Bloomfield
Exposure to high-dose ionizing radiation during medical treatment exerts well-documented deleterious effects on bone health, reducing bone density and contributing to bone growth retardation in young patients and spontaneous fracture in postmenopausal women. However, the majority of human radiation exposures occur in a much lower dose range than that used in the radiation oncology clinic. Furthermore, very few studies have examined the effects of low-dose ionizing radiation on bone integrity and results have been inconsistent...
August 3, 2017: Radiation Research
https://www.readbyqxmd.com/read/28764769/anabolic-role-of-lysyl-oxidase-like-2-in-cartilage-of-knee-and-temporomandibular-joints-with-osteoarthritis
#6
Weam Alshenibr, Mustafa M Tashkandi, Saqer F Alsaqer, Yazeed Alkheriji, Amelia Wise, Sadanand Fulzele, Pushkar Mehra, Mary B Goldring, Louis C Gerstenfeld, Manish V Bais
BACKGROUND: Lysyl oxidase like-2 (LOXL2) is a copper-dependent amine oxidase. Our previous studies showed that LOXL2 is elevated during mouse fracture healing. The goal of this study was to evaluate the potential of LOXL2 to act as an anabolic agent in cartilage affected by osteoarthritis (OA). METHODS: LOXL2 was visualized in tissues from human knee and hip joints and temporomandibular joints (TMJ) by immunofluorescence. The activity of LOXL2 in human articular and TMJ chondrocytes was assessed by cell-based assays, microarray analysis, and RT-qPCR, and LOXL2-mediated activation of NF-κB and extracellular signal-related kinase (ERK) signaling pathways was measured by western blotting...
August 2, 2017: Arthritis Research & Therapy
https://www.readbyqxmd.com/read/28762588/an-investigation-of-shock-wave-therapy-and-low-intensity-pulsed-ultrasound-on-fracture-healing-under-reduced-loading-conditions-in-an-ovine-model
#7
Benjamin C Gadomski, Kirk C McGilvray, Jeremiah T Easley, Ross H Palmer, Jian Jiao, Xiaofei Li, Yi-Xian Qin, Christian M Puttlitz
The use of shock wave therapy (SWT) and low-intensity pulsed ultrasound (LIPUS) as countermeasures to the inhibited fracture healing experienced during mechanical unloading was investigated by administering treatment to the fracture sites of mature, female, Rambouillet Columbian ewes exposed to partial mechanical unloading or full gravitational loading. The amount of fracture healing experienced by the treatment groups was compared to controls in which identical surgical and testing protocols were administered except for SWT or LIPUS treatment...
August 1, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28758116/structure-and-function-of-trypsin-loaded-fibrinolytic-liposomes
#8
Anna Tanka-Salamon, Attila Bóta, András Wacha, Judith Mihály, Miklós Lovas, Krasimir Kolev
Protease encapsulation and its targeted release in thrombi may contribute to the reduction of haemorrhagic complications of thrombolysis. We aimed to prepare sterically stabilized trypsin-loaded liposomes (SSLT) and characterize their structure and fibrinolytic efficiency. Hydrogenated soybean phosphatidylcholine-based SSLT were prepared and their structure was studied by transmission electron microscopy combined with freeze fracture (FF-TEM), Fourier transform infrared spectroscopy (FT-IR), and small-angle X-ray scattering (SAXS)...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28748389/predisposing-factors-associated-with-atypical-femur-fracture-among-postmenopausal-korean-women-receiving-bisphosphonate-therapy-8%C3%A2-years-experience-in-a-single-center
#9
J H Koh, J P Myong, J Yoo, Y-W Lim, J Lee, S-K Kwok, S-H Park, J H Ju
The risk factors for atypical femur fracture in patients exposed to bisphosphonates for at least 1 year were examined. Prolonged and continuous use of bisphosphonates, long-term use of glucocorticoids, and a higher body mass index were associated with increased risk of atypical femur fracture. INTRODUCTION: The purpose of the present study is to determine whether rheumatoid arthritis (RA) and other clinical factors are associated with an increased risk of bisphosphonate (BP)-related atypical femur fracture (AFF)...
July 27, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/28737011/a-distinctive-patchy-osteomalacia-characterises-phospho1-deficient-mice
#10
Alan Boyde, Katherine A Staines, Behzad Javaheri, Jose Luis Millan, Andrew A Pitsillides, Colin Farquharson
The phosphatase PHOSPHO1 is involved in the initiation of biomineralisation. Bones in Phospho1 knockout (KO) mice show histological osteomalacia with frequent bowing of long bones and spontaneous fractures: they contain less mineral, with smaller mineral crystals. However, the consequences of Phospho1 ablation on the microscale structure of bone are not yet fully elucidated. Tibias and femurs obtained from wild-type and Phospho1 null (KO) mice (25-32 weeks old) were embedded in PMMA, cut and polished to produce near longitudinal sections...
August 2017: Journal of Anatomy
https://www.readbyqxmd.com/read/28709792/fixation-of-ultrasmall-proximal-pole-scaphoid-fractures-using-bioabsorbable-osteochondral-fixation-nails
#11
REVIEW
Eugene T Ek, Kemble Wang
Surgical treatment of ultrasmall proximal pole scaphoid fractures poses a number of challenges. The fragment may be too small to fix with conventional headless screw fixation owing to the high risk of fragmentation upon insertion. However, excision of the fragment risks compromising the scapholunate ligament complex and also exposes the radioscaphoid joint to potential degenerative changes. Under these circumstances, we describe the use of bioabsorbable osteochondral fixation nails that allows stable low-profile fixation while minimizing the risk of fracturing the proximal pole...
July 11, 2017: Journal of Hand Surgery
https://www.readbyqxmd.com/read/28705123/surgery-of-patellar-fractures-using-a-medial-parapatellar-approach
#12
Yong-Cheol Yoon, Jae-Ang Sim, Jin-Hun Hong
PURPOSE: The general surgical approach for patellar fractures has a significant weakness, in that the articular facet is invisible because the fixation is performed using radiation amplifiers after exposing the fracture site through vertical or transverse dissection on the anterior patella. We report excellent outcomes in the surgical treatment of patellar fractures, using a medial parapatellar approach. METHODS: This study evaluated 20 patients who underwent surgery between August 2008 and April 2014 to correct patellar fractures with comminution or with displacement of the articular facet of ≥2 mm and who had ≥1 year of follow-up...
May 2017: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/28703885/use-of-a-72-cm-long-extended-bilateral-deep-inferior-epigastric-artery-perforator-free-flap-for-reconstruction-of-a-lower-leg-with-no-suitable-recipient-vessel-around-the-injury-zone-a-case-report
#13
Hidehiko Yoshimatsu, Takumi Yamamoto, Akitatsu Hayashi, Takuya Iida
In free-flap reconstruction of the lower extremity, due either to trauma or pre-existing vascular disease, healthy vessels may not be readily available in the proximity of the defect. A variety of options including a cross-leg free flap, vein grafts, arteriovenous loops, and "bridging" flaps have been used to address the issue. The purpose of this report is to present a case in which a 72-cm long extended bilateral deep inferior epigastric artery perforator (DIEP) free flap was used for coverage of a 20 × 25 cm soft tissue defect of the lower leg following a Gustilo grade IIIC fracture in a 29-year-old man...
July 13, 2017: Microsurgery
https://www.readbyqxmd.com/read/28701043/in-situ-x-ray-tomography-study-of-cement-exposed-to-co2-saturated-brine
#14
E A Chavez Panduro, M Torsæter, K Gawel, R Bjørge, A Gibaud, Y Yang, S Bruns, Y Zheng, H O Sørensen, D W Breiby
For successful CO2 storage in underground reservoirs, the potential problem of CO2 leakage needs to be addressed. A profoundly improved understanding of the behavior of fractured cement under realistic subsurface conditions including elevated temperature, high pressure and the presence of CO2 saturated brine is required. Here, we report in situ X-ray micro computed tomography (μ-CT) studies visualizing the microstructural changes upon exposure of cured Portland cement with an artificially engineered leakage path (cavity) to CO2 saturated brine at high pressure...
August 4, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28700215/roles-of-transport-limitations-and-mineral-heterogeneity-in-carbonation-of-fractured-basalts
#15
Anne H Menefee, Peiyuan Li, Daniel E Giammar, Brian R Ellis
Basalt formations could enable secure long-term carbon storage by trapping injected CO2 as stable carbonates. Here, a predictive modeling framework was designed to evaluate the roles of transport limitations and mineral spatial distributions on mineral dissolution and carbonation reactions in fractured basalts exposed to CO2-acidified fluids. Reactive transport models were developed in CrunchTope based on data from high-temperature, high-pressure flow-through experiments. Models isolating the effect of transport compared nine flow conditions under the same mineralogy...
August 2, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28692844/comparative-bonding-ability-to-dentin-of-a-universal-adhesive-system-and-monomer-conversion-as-functions-of-extended-light-curing-times-and-storage
#16
Paula Costa Pinheiro Sampaio, Paula de Castro Kruly, Clara Cabral Ribeiro, Leandro Augusto Hilgert, Patrícia Nóbrega Rodrigues Pereira, Polliana Mendes Candia Scaffa, Vinicius Di Hipólito, Paulo Henrique Perlatti D'Alpino, Fernanda Cristina Pimentel Garcia
OBJECTIVES: The purpose of this in vitro study was to evaluate the bonding ability and monomer conversion of a universal adhesive system applied to dentin as functions of different curing times and storage. The results were compared among a variety of commercial adhesives. MATERIALS AND METHODS: Flat superficial dentin surfaces were exposed on human molars and assigned into one of the following adhesives (n = 15): total-etch Adper Single Bond 2 (SB) and Optibond Solo Plus (OS), self-etch Optibond All in One (OA) and Clearfil SE Bond (CSE), and Scotchbond Universal Adhesive in self-etch mode (SU)...
June 27, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28685282/bone-mineral-density-in-adults-with-down-syndrome
#17
A Carfì, R Liperoti, D Fusco, S Giovannini, V Brandi, D L Vetrano, E Meloni, D Mascia, E R Villani, E Manes Gravina, R Bernabei, G Onder
This study analyzed data of bone mineral density (BMD) from a large cohort of adults with Down syndrome (DS). BMD was found to decrease with age more rapidly in these subjects than in the general population, exposing adults with DS to an increased risk of osteoporosis and bone fracture. INTRODUCTION: Down syndrome (DS) in adulthood presents with a high prevalence of osteoporosis. However, in DS, bone mineral density (BMD) can be underestimated due to short stature. Furthermore, the rate of age-related decline in BMD and its association with gender in DS has been rarely evaluated or compared with the general population...
July 6, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/28650945/treatment-approach-for-infection-of-healed-fractures-after-internal-fixation
#18
Joshua M Lawrenz, Salvatore J Frangiamore, Ajinkya A Rane, W Alex Cantrell, Heather A Vallier
OBJECTIVE: To review the efficacy of a treatment approach for patients with infection and colonized implants after open reduction and internal fixation of fractures. DESIGN: Retrospective case series. SETTING: Level one trauma center. PATIENTS: Twenty patients were treated for wound infection with colonized implants after open reduction and internal fixation. INTERVENTION: Surgical debridement, removal of implants and a short post-operative oral antibiotic course...
June 15, 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28644936/the-deltoid-lift-a-comparison-study-of-exposure-area-in-proximal-humeral-approaches
#19
Michael Ting, Nicholas Kusnezov, John Dunn, Alok K Dwivedi, Miguel A Pirela-Cruz
BACKGROUND: Adequate exposure of the proximal humerus is necessary to address atypical or complex proximal humerus fractures and orthopedic tumors. Surgical management may be difficult through existing approaches due to their limited nature and the delicate neurovascular anatomy of the shoulder. The deltoid lift, a previously described extensile approach, can be incorporated into the surgeon's armamentarium as an alternative exposure to the proximal humerus. The objective of this study was to quantify and compare the humeral exposure achieved through the deltoid lift with the standard direct lateral deltoid-splitting, anterolateral acromial, and deltopectoral approaches in terms of surface area and exposure of key anatomic landmarks...
July 2017: Hand: Official Journal of the American Association for Hand Surgery
https://www.readbyqxmd.com/read/28642650/epidemiological-study-on-lisfranc-injuries
#20
Marcel Faraco Sobrado, Guilherme Honda Saito, Marcos Hideyo Sakaki, Pedro Augusto Pontin, Alexandre Leme Godoy Dos Santos, Túlio Diniz Fernandes
OBJECTIVE: To analyze the characteristics of patients with Lisfranc injuries and their associated fractures . METHODS: This is a retrospective analysis on 42 patients with Lisfranc injuries hospitalized at Instituto de Ortopedia e Traumatologia do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, between 2006 and 2010. Parameters on patient profile, risk factors, fracture characteristics, data on treatment and acute complications were analyzed ...
January 2017: Acta Ortopedica Brasileira
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