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https://www.readbyqxmd.com/read/28735427/biomechanical-evaluation-of-distal-biceps-tendon-repair-using-tension-slide-technique-and-knotless-fixation-technique
#1
David D Savin, Hristo Piponov, Jonathan N Watson, Ari R Youderian, Farid Amirouche, Giovanni F Solitro, Mark R Hutchinson, Benjamin A Goldberg
BACKGROUND: Acute distal biceps tendon ruptures are uncommon injuries that often affect young active males, typically resulting from an eccentric load on their dominant extremity. The purpose of this study was to compare pullout strength and tendon gapping in the tension slide technique (TST) versus a knotless fixation technique (KFT). METHODS: Two sets of experiments were performed using cadaveric elbow specimens. In the first experiment, eight elbows from different cadavers were tested to compare TST with a standard locking whipstitch with KFT, four elbows in each group, using a standard locking whipstitch...
July 22, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28734986/exogenous-hedgehog-antagonist-delays-but-does-not-prevent-fracture-healing-in-young-mice
#2
Xiaochen Liu, Jennifer A McKenzie, Clayton W Maschhoff, Michael J Gardner, Matthew J Silva
Fracture healing recapitulates many aspects of developmental osteogenesis. The hedgehog (Hh) signaling pathway, essential to skeletal development, is upregulated during fracture healing, although its importance is unclear. Our goal was to assess the functional importance of Hh signaling in endochondral fracture healing. We created closed, transverse diaphyseal femur fractures in mice, stabilized with an intramedullary pin, and administered a systemic Hh inhibitor or vehicle. Because Hh pathway activation is mediated by the receptor Smoothened (Smo), we used the Smo antagonist GDC-0449 (GDC, 50mg/kg, twice daily) to target the pathway...
July 19, 2017: Bone
https://www.readbyqxmd.com/read/28734719/coronoid-reconstruction-using-osteochondral-grafts-a-biomechanical-study
#3
Enrico Bellato, Youngbok Kim, James S Fitzsimmons, Lawrence J Berglund, Alexander W Hooke, Daniel R Bachman, Shawn W O'Driscoll
HYPOTHESIS: The purposes of this study were to test the hypothesis that coronoid deficiency in the setting of posteromedial rotatory instability (PMRI) must be reconstructed to restore articular contact pressures to normal and to compare 3 different osteochondral grafts for this purpose. METHODS: After creation of a anteromedial fracture, six cadaveric elbows were tested under gravity varus stress using a custom-made machine designed to simulate muscle loads and to passively flex the elbow...
July 19, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28734700/predicting-muscle-forces-during-the-propulsion-phase-of-single-leg-triple-hop-test
#4
Felipe Costa Alvim, Paulo Roberto Garcia Lucareli, Luciano Luporini Menegaldo
Functional biomechanical tests allow the assessment of musculoskeletal system impairments in a simple way. Muscle force synergies associated with movement can provide additional information for diagnosis. However, such forces cannot be directly measured noninvasively. This study aims to estimate muscle activations and forces exerted during the preparation phase of the single leg triple hop test. Two different approaches were tested: static optimization (SO) and computed muscle control (CMC). As an indirect validation, model-estimated muscle activations were compared with surface electromyography (EMG) of selected hip and thigh muscles...
July 15, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28734257/comparison-of-femoropopliteal-artery-stents-under-axial-and-radial-compression-axial-tension-bending-and-torsion-deformations
#5
Kaspars Maleckis, Paul Deegan, William Poulson, Cole Sievers, Anastasia Desyatova, Jason MacTaggart, Alexey Kamenskiy
High failure rates of Peripheral Arterial Disease (PAD) stenting appear to be associated with the inability of certain stent designs to accommodate severe biomechanical environment of the femoropopliteal artery (FPA) that bends, twists, and axially compresses during limb flexion. Twelve Nitinol stents (Absolute Pro, Supera, Lifestent, Innova, Zilver, Smart Control, Smart Flex, EverFlex, Viabahn, Tigris, Misago, and Complete SE) were quasi-statically tested under bench-top axial and radial compression, axial tension, bending, and torsional deformations...
July 13, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28733255/nanofiber-structured-hydrogel-yarns-with-ph-response-capacity-and-cardiomyocyte-drivability-for-bio-microactuator-application
#6
Shaohua Wu, Bin Duan, Xiaohong Qin, Jonathan T Butcher
Polymeric hydrogels have great potential in soft biological micro-actuator applications. However, inappropriate micro-architecture, non-anisotropy, weak biomechanics, and inferior response behaviors limit their development. In this study, we designed and manufactured novel polyacrylonitrile (PAN)-based hydrogel yarns composed with uniaxially aligned nanofibers. The nanofibrous hydrogel yarns possessed anisotropic architecture and robust mechanical properties with flexibility, and could be assembled into defined scaffold structures by subsequent processes...
July 18, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28733037/efficient-probabilistic-finite-element-analysis-of-a-lumbar-motion-segment
#7
Dana J Coombs, Paul J Rullkoetter, Peter J Laz
Finite element models of the lumbar spine are useful in assessing biomechanics and performance of implants. Models are often developed using the anatomy of an individual subject. Average mechanical property values for the annulus and other soft tissue structures are typically utilized from the literature, as data for the same subject are not available. However, these properties can have significant variability. While probabilistic methods enable the impact of soft tissue property variability on spine mechanics to be assessed, they often require lengthy computation times...
July 11, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28732313/biomechanics-of-cell-rearrangements-in-drosophila
#8
REVIEW
Boris Guirao, Yohanns Bellaïche
To acquire their adequate size and shape, living tissues grow and substantially deform as they develop. To do so, the cells making up the tissue can grow and deform as well, but they can also divide, intercalate and die. Among those cell behaviors, cell intercalation, also named cell rearrangement, is a major contributor to the morphogenesis of many cohesive tissues since it enables tissues to drastically deform as they develop while keeping their cohesiveness and avoiding extreme deformation of their cells...
July 18, 2017: Current Opinion in Cell Biology
https://www.readbyqxmd.com/read/28731981/technology-in-strength-and-conditioning-assessing-bodyweight-squat-technique-with-wearable-sensors
#9
Martin A OʼReilly, Darragh F Whelan, Tomas E Ward, Eamonn Delahunt, Brian M Caulfield
O'Reilly, MA, Whelan, DF, Ward, TE, Delahunt, E, and Caulfield, BM. Technology in strength and conditioning: assessing bodyweight squat technique with wearable sensors. J Strength Cond Res 31(8): 2303-2312, 2017-Strength and conditioning (S&C) coaches offer expert guidance to help those they work with achieve their personal fitness goals. However, it is not always practical to operate under the direct supervision of an S&C coach and consequently individuals are often left training without expert oversight. Recent developments in inertial measurement units (IMUs) and mobile computing platforms have allowed for the possibility of unobtrusive motion tracking systems and the provision of real-time individualized feedback regarding exercise performance...
August 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28731978/differences-in-spatiotemporal-parameters-between-trained-runners-and-untrained-participants
#10
Josué Gómez-Molina, Ana Ogueta-Alday, Christopher Stickley, Jesús Cámara, Jon Cabrejas-Ugartondo, Juan García-López
Gómez-Molina, J, Ogueta-Alday, A, Stickley, C, Tobalina, JC, Cabrejas-Ugartondo, J, and García-López, J. Differences in spatiotemporal parameters between trained runners and untrained participants. J Strength Cond Res 31(8): 2169-2175, 2017-The aim of this study was to compare the spatiotemporal parameters of trained runners and untrained participants with the same foot strike pattern (rearfoot) during running at controlled speeds. Twenty-one participants were classified in 2 groups according to their training experience: Trained (n = 10, amateur runners with long distance training experience) and Untrained (n = 11, healthy untrained participants)...
August 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28731878/correlation-of-corneal-biomechanical-stiffness-with-refractive-error-and-ocular-biometry-in-a-pediatric-population
#11
Jyoti Matalia, Mathew Francis, Pooja Gogri, Pratibha Panmand, Himanshu Matalia, Abhijit Sinha Roy
PURPOSE: To assess the correlation between corneal biomechanical stiffness and refractive error (RE) in the pediatric population. METHODS: A total of 733 pediatric eyes were included in the study retrospectively. All eyes underwent corneal tomography (Pentacam), RE assessment, and air-puff deformation (Corvis-ST). Waveform analyses of deformation provided corneal stiffness (CS) and extraocular tissue stiffness (EOS). Eyes were subgrouped into emmetropia [manifest refraction spherical equivalent (MRSE) ∼ 0 D], hyperopia (MRSE > 0 D), myopia I (MRSE between 0 D and -3 D), myopia II (MRSE between -3 D and -6 D), and myopia III (MRSE greater than -6 D) for multivariate analyses...
July 19, 2017: Cornea
https://www.readbyqxmd.com/read/28731832/effects-of-cervical-high-velocity-low-amplitude-techniques-on-range-of-motion-strength-performance-and-cardiovascular-outcomes-a-review
#12
Xabier Galindez-Ibarbengoetxea, Igor Setuain, Lars L Andersen, Robinson Ramírez-Velez, Miriam González-Izal, Andoni Jauregi, Mikel Izquierdo
BACKGROUND: Cervical high-velocity low-amplitude (HVLA) manipulation technique is among the oldest and most frequently used chiropractic manual therapy, but the physiologic and biomechanics effects were not completely clear. OBJECTIVE: This review aims to describe the effects of cervical HVLA manipulation techniques on range of motion, strength, and cardiovascular performance. METHODS/DESIGN: A systematic search was conducted of the electronic databases from January 2000 to August 2016: PubMed (n = 131), ScienceDirect (n = 101), Scopus (n = 991), PEDro (n = 33), CINAHL (n = 884), and SciELO (n = 5)...
July 21, 2017: Journal of Alternative and Complementary Medicine: Research on Paradigm, Practice, and Policy
https://www.readbyqxmd.com/read/28730921/kinematic-repeatability-of-a-multi-segment-foot-model-for-dance
#13
Sarah L Carter, Nahoko Sato, Luke S Hopper
The purpose of this study was to determine the intra and inter-assessor repeatability of a modified Rizzoli Foot Model for analysing the foot kinematics of ballet dancers. Six university-level ballet dancers performed the movements; parallel stance, turnout plié, turnout stance, turnout rise and flex-point-flex. The three-dimensional (3D) position of individual reflective markers and marker triads was used to model the movement of the dancers' tibia, entire foot, hindfoot, midfoot, forefoot and hallux. Intra and inter-assessor reliability demonstrated excellent (ICC ≥ 0...
July 21, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28730911/important-learning-factors-in-high-and-low-achieving-students-in-undergraduate-biomechanics
#14
ChengTu Hsieh, Duane Knudson
The purpose of the present study was to document crucial factors associated with students' learning of biomechanical concepts, particularly between high- and-low achieving students. Students (N = 113) from three introductory biomechanics classes at two public universities volunteered for the study. Two measures of students' learning were obtained, final course grade and improvement on the Biomechanics Concept Inventory version 3 administered before and after the course. Participants also completed a 15-item questionnaire documenting student learning characteristics, effort, and confidence...
July 21, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28730871/effects-of-timing-of-signal-indicating-jump-directions-on-knee-biomechanics-in-jump-landing-jump-tasks
#15
Mitchell L Stephenson, Taylour J Hinshaw, Haley A Wadley, Qin Zhu, Margaret A Wilson, Mark Byra, Boyi Dai
A variety of the available time to react (ATR) has been utilised to study knee biomechanics during reactive jump-landing tasks. The purpose was to quantify knee kinematics and kinetics during a jump-land-jump task of three possible directions as the ATR was reduced. Thirty-four recreational athletes performed 45 trials of a jump-land-jump task, during which the direction of the second jump (lateral, medial or vertical) was indicated before they initiated the first jump, the instant they initiated the first jump, 300 ms before landing, 150 ms before landing or at the instant of landing...
July 21, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28730547/sideways-fall-induced-impact-force-and-its-effect-on-hip-fracture-risk-a-review
#16
REVIEW
M Nasiri Sarvi, Y Luo
Osteoporotic hip fracture, mostly induced in falls among the elderly, is a major health burden over the world. The impact force applied to the hip is an important factor in determining the risk of hip fracture. However, biomechanical researches have yielded conflicting conclusions about whether the fall-induced impact force can be accurately predicted by the available models. It also has been debated whether or not the effect of impact force has been considered appropriately in hip fracture risk assessment tools...
July 20, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/28730531/comparing-different-tissue-engineered-repair-materials-for-the-treatment-of-pelvic-organ-prolapse-and-urinary-incontinence-which-material-is-better
#17
Xiaojuan Wang, Yisong Chen, Zhongyong Fan, Keqin Hua
INTRODUCTION AND HYPOTHESIS: Synthetic non-absorbable meshes are widely used to augment surgical repair of pelvic organ prolapse (POP) and stress urinary incontinence (SUI), but these meshes are associated with serious complications. This study compares the attachment and extracellular matrix (ECM) production of adipose-derived stem cells (ADSCs) on different biodegradable nanomaterials to develop tissue engineered repair materials. METHODS: Rat ADSCs were isolated and cultured on electrospun poly-L-lactic acid (PLA) and electrospun poly(L-lactide)-trimethylene carbonate-gycolide (PLTG) terpolymers for 1 and 2 weeks...
July 20, 2017: International Urogynecology Journal
https://www.readbyqxmd.com/read/28730248/clavicle-anatomical-osteosynthesis-plate-breakage-failure-analysis-report-based-on-patient-morphological-parameters
#18
Rodica Marinescu, Vasile Iulian Antoniac, Dan Ioan Stoia, Dan Constantin Lăptoiu
Clavicle fracture reported incidence is about 5% of fractures in adult; among them, those located in the middle third of the shaft represent more than 80% from the total of cases. Due to the special morphological and biomechanical constraints of the clavicle, several methods for restoring morphological integrity in these fractures are described, including conservative, non-surgical treatment. The last 10 years of clinical studies in the field have favored the surgical treatment for selected cases; several osteosynthesis implants are in use - mostly anatomical plates with specific advantages and documented complications...
2017: Romanian Journal of Morphology and Embryology, Revue Roumaine de Morphologie et Embryologie
https://www.readbyqxmd.com/read/28729775/role-of-tumor-microenvironment-in-triple-negative-breast-cancer-and-its-prognostic-significance
#19
Tianjian Yu, Genhong Di
Breast cancer has been shown to live in the tumor microenvironment, which consists of not only breast cancer cells themselves but also a significant amount of pathophysiologically altered surrounding stroma and cells. Diverse components of the breast cancer microenvironment, such as suppressive immune cells, re-programmed fibroblast cells, altered extracellular matrix (ECM) and certain soluble factors, synergistically impede an effective anti-tumor response and promote breast cancer progression and metastasis...
June 2017: Chinese Journal of Cancer Research, Chung-kuo Yen Cheng Yen Chiu
https://www.readbyqxmd.com/read/28729511/an-organic-inorganic-perovskite-ferroelectric-with-large-piezoelectric-response
#20
Yu-Meng You, Wei-Qiang Liao, Dewei Zhao, Heng-Yun Ye, Yi Zhang, Qionghua Zhou, Xianghong Niu, Jinlan Wang, Peng-Fei Li, Da-Wei Fu, Zheming Wang, Song Gao, Kunlun Yang, Jun-Ming Liu, Jiangyu Li, Yanfa Yan, Ren-Gen Xiong
Molecular piezoelectrics are highly desirable for their easy and environment-friendly processing, light weight, low processing temperature, and mechanical flexibility. However, although 136 years have passed since the discovery in 1880 of the piezoelectric effect, molecular piezoelectrics with a piezoelectric coefficient d33 comparable with piezoceramics such as barium titanate (BTO; ~190 picocoulombs per newton) have not been found. We show that trimethylchloromethyl ammonium trichloromanganese(II), an organic-inorganic perovskite ferroelectric crystal processed from aqueous solution, has a large d33 of 185 picocoulombs per newton and a high phase-transition temperature of 406 kelvin (K) (16 K above that of BTO)...
July 21, 2017: Science
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