keyword
MENU ▼
Read by QxMD icon Read
search

Biomechanical strength

keyword
https://www.readbyqxmd.com/read/28538320/the-effects-of-a-heel-wedge-on-hip-pelvis-and-trunk-biomechanics-during-squatting-in-resistance-trained-individuals
#1
Jesse M Charlton, Connor A Hammond, Christopher K Cochrane, Gillian L Hatfield, Michael A Hunt
Charlton, JM, Hammond, CA, Cochrane, CK, Hatfield, GL, and Hunt, MA. The effects of a heel wedge on hip, pelvis, and trunk biomechanics during squatting in resistance trained individuals. J Strength Cond Res 31(6): 1678-1687, 2017-Barbell back squats are a popular exercise for developing lower extremity strength and power. However, this exercise has potential injury risks, particularly to the lumbar spine, pelvis, and hip joint. Previous literature suggests heel wedges as a means of favorably adjusting trunk and pelvis kinematics with the intention of reducing such injury risks...
June 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28534698/effect-of-parathyroid-hormone-on-healing-in-osteoporotic-fractures-via-a-phospholipase-c-independent-pathway
#2
Wei-Long Li, Xiao Yu, Zhi-Ping Huang, Qing-Jiang Pang
Objective This study was performed to investigate the effect of parathyroid hormone (PTH) on healing in osteoporotic fractures via a phospholipase C (PLC)-independent pathway and explore the mechanism of PTH-mediated bone formation. Methods Ninety-six 12-week-old C57BL/6J female mice underwent bilateral ovariectomy. One month later, the lower third of the femur was fractured and the mice were treated using saline, PTH(1-28), PTH(1-34), zoledronic acid (ZA), PTH(1-28)+ZA, and PTH(1-34)+ZA. The mice were killed at weeks 2 and 4 in each group...
January 1, 2017: Journal of International Medical Research
https://www.readbyqxmd.com/read/28530131/a-novel-combination-of-a-polycaprolactone-fumarate-pclf-scaffold-with-polyethylene-terephthalate-pet-sutures-for-intra-articular-ligament-regeneration
#3
Joshua Parry, Eric R Wagner, Peter Kok, Mahrokh Dadsetan, Michael J Yaszemski, Andre J van Wijnen, Sanjeev Kakar
Intra-articular ligamentous injuries are typically unrepairable and have limited outcomes after graft reconstruction. A combination of porous polycaprolactone fumarate (PCLF) scaffolds with polyethylene terephthalate (PET) sutures was developed with the goal of regenerating intra-articular ligaments. Scaffolds were fabricated by injecting PCLF over 3D-printed molds containing two strands of PET suture down its central pore followed by crosslinking. Scaffolds were seeded with human mesenchymal stem cells (MSCs) from adipose tissue...
May 20, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28530017/mechanical-stress-by-spasticity-accelerates-fracture-healing-after-spinal-cord-injury
#4
Naoyoshi Sakitani, Hiroyuki Iwasawa, Masato Nomura, Yasushi Miura, Hiroshi Kuroki, Junya Ozawa, Hideki Moriyama
Accelerated fracture healing in patients with spinal cord injuries (SCI) is often encountered in clinical practice. However, there is no distinct evidence in the accelerated fracture healing, and the mechanisms of accelerated fracture healing in SCI are poorly understood. We aimed to determine whether SCI accelerated fracture healing in morphology and strength, to characterize the healing process with SCI, and to clarify the factors responsible for accelerated fracture healing. In total, 39 male Wistar rats were randomly divided into healthy control without intervention, SCI only, fracture with SCI, botulinum toxin (BTX) A-treated fracture with SCI, and propranolol-treated fracture with SCI groups...
May 22, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/28528791/microct-based-finite-element-models-as-a-tool-for-virtual-testing-of-cortical-bone
#5
Masoud Ramezanzadehkoldeh, Bjørn H Skallerud
The aim of this study was to assess a virtual biomechanics testing approach purely based on microcomputed tomography (microCT or µCT) data, providing non-invasive methods for determining the stiffness and strength of cortical bone. Mouse femurs were µCT scanned prior to three-point-bend tests. Then microCT-based finite element models were generated with spatial variation in bone elastoplastic properties and subject-specific femur geometries. Empirical relationships of density versus Young's moduli and yield stress were used in assigning elastoplastic properties to each voxel...
May 18, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28528404/a-direct-comparison-of-the-effects-of-the-antiretroviral-drugs-stavudine-tenofovir-and-the-combination-lopinavir-ritonavir-on-bone-metabolism-in-a-rat-model
#6
M M Conradie, M van de Vyver, E Andrag, M Conradie, W F Ferris
Antiretroviral (ARV) treatment may induce metabolic complications in HIV patients on long-term therapy that can affect bone health. In this study, the effects of the ARVs Stavudine (d4T), Tenofovir (TDF) and Lopinavir/ritonavir (LPV/r) on bone metabolism and lipodystrophy were directly compared in rats to negate the consequences of HIV-associated confounding factors. Healthy 12-14-week-old male Wistar rats (n = 40) were divided into four treatment groups and received an oral animal equivalent dose of either Stavudine (6...
May 20, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/28526627/dynamic-fatigue-measurement-of-human-erythrocytes-using-dielectrophoresis
#7
Yuhao Qiang, Jia Liu, E Du
Erythrocytes must undergo severe deformation to pass through narrow capillaries and submicronic splenic slits for several hundred thousand times in their normal lifespan. Studies of erythrocyte biomechanics have been mainly focused on cell deformability and rheology measured from a single application of stress and mostly under a static or quasi-static state using classical biomechanical techniques, such as optical tweezers and micropipette aspiration. Dynamic behavior of erythrocytes in response to cyclic stresses that contributes to the membrane failure in blood circulation is not fully understood...
May 16, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28522238/biomechanical-comparison-of-four-coupled-fixation-systems-for-acl-reconstruction-with-bone-socket-or-full-tunnel-on-the-tibial-side
#8
Edoardo Monaco, Mattia Fabbri, Riccardo Maria Lanzetti, Andrea Del Duca, Luca Labianca, Andrea Ferretti
BACKGROUND: To compare in an animal model the biomechanical properties of four coupled fixation devices currently used in ACL reconstruction. Three out of four devices used a full tibial tunnel with an interference screw, while the other one system used a tibial socket and an adjustable loop suspension device. The null hypothesis is that there are no biomechanical differences between all the techniques tested. METHODS: Thirty two femur-graft-tibia complexes were mounted on a tensile machine using bovine digital extensor tendons, porcine knees and four different fixation device combinations: After a preconditioning with a tensile load of 90N for five minutes, 1000cycles between 0 and 150N were applied to the complex before the final pulled to failure...
May 15, 2017: Knee
https://www.readbyqxmd.com/read/28515439/the-biomechanics-behind-extreme-osteophagy-in-tyrannosaurus-rex
#9
Paul M Gignac, Gregory M Erickson
Most carnivorous mammals can pulverize skeletal elements by generating tooth pressures between occluding teeth that exceed cortical bone shear strength, thereby permitting access to marrow and phosphatic salts. Conversely, carnivorous reptiles have non-occluding dentitions that engender negligible bone damage during feeding. As a result, most reptilian predators can only consume bones in their entirety. Nevertheless, North American tyrannosaurids, including the giant (13 metres [m]) theropod dinosaur Tyrannosaurus rex stand out for habitually biting deeply into bones, pulverizing and digesting them...
May 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28514698/clinical-outcomes-and-frontal-plane-two-dimensional-biomechanics-during-the-30-second-single-leg-stance-test-in-patients-before-and-after-hip-abductor-tendon-reconstructive-surgery
#10
Rose E Huxtable, Timothy R Ackland, Gregory C Janes, Jay R Ebert
BACKGROUND: Hip abductor tendon tears are a common cause of Greater Trochanteric Pain Syndrome. Conservative treatments are often ineffective and surgical reconstruction may be recommended. This study investigated the improvement in clinical outcomes and frontal plane two-dimensional biomechanics during a 30-second single leg stance test, in patients undergoing reconstruction. We hypothesized that clinical scores and pertinent biomechanical variables would significantly improve post-surgery, and these outcomes would be significantly correlated...
May 10, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28513544/morphogenetically-active-barrier-membrane-for-guided-bone-regeneration-based-on-amorphous-polyphosphate
#11
Xiaohong Wang, Maximilian Ackermann, Meik Neufurth, Shunfeng Wang, Heinz C Schröder, Werner E G Müller
We describe a novel regeneratively-active barrier membrane which consists of a durable electrospun poly(ε-caprolactone) (PCL) net covered with a morphogenetically-active biohybrid material composed of collagen and inorganic polyphosphate (polyP). The patch-like fibrous collagen structures are decorated with small amorphous polyP nanoparticles (50 nm) formed by precipitation of this energy-rich and enzyme-degradable (alkaline phosphatase) polymer in the presence of calcium ions. The fabricated PCL-polyP/collagen hybrid mats are characterized by advantageous biomechanical properties, such as enhanced flexibility and stretchability with almost unaltered tensile strength of the PCL net...
May 17, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28511967/a-sliding-hip-screw-augmented-with-2-screws-is-biomechanically-similar-to-an-inverted-triad-of-cannulated-screws-in-repair-of-a-pauwels-type-iii-fracture
#12
B Kemker, K Magone, J Owen, P Atkinson, S Martin, T Atkinson
OBJECTIVE: Pauwels III femoral neck fractures are highly unstable. These fractures are commonly treated with three cannulated screws or sliding hip screw (SHS) implants, however high rates of non-union persist. A hybrid SHS construct has recently been proposed. The objective of the study was to compare this construct to the familiar inverted triad of cannulated screws and to a single SHS. METHODS: Fourth generation biomechanical femur analogs were used to create a highly repeatable injury model...
May 8, 2017: Injury
https://www.readbyqxmd.com/read/28509826/sclerostin-antibody-treatment-enhances-rotator-cuff-tendon-to-bone-healing-in-an-animal-model
#13
Shivam A Shah, Ioannis Kormpakis, Necat Havlioglu, Michael S Ominsky, Leesa M Galatz, Stavros Thomopoulos
BACKGROUND: Rotator cuff tears are a common source of pain and disability, and poor healing after repair leads to high retear rates. Bone loss in the humeral head before and after repair has been associated with poor healing. The purpose of the current study was to mitigate bone loss near the repaired cuff and improve healing outcomes. METHODS: Sclerostin antibody (Scl-Ab) treatment, previously shown to increase bone formation and strength in the setting of osteoporosis, was used in the current study to address bone loss and enhance rotator cuff healing in an animal model...
May 17, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28505593/foot-ankle-complex-injury-risk-curves-using-calcaneus-bone-mineral-density-data
#14
Narayan Yoganandan, Sajal Chirvi, Liming Voo, Nicholas DeVogel, Frank A Pintar, Anjishnu Banerjee
OBJECTIVE: Biomechanical data from post mortem human subject (PMHS) experiments are used to derive human injury probability curves and develop injury criteria. This process has been used in previous and current automotive crashworthiness studies, Federal safety standards, and dummy design and development. Human bone strength decreases as the individuals reach their elderly age. Injury risk curves using the primary predictor variable (e.g., force) should therefore account for such strength reduction when the test data are collected from PMHS specimens of different ages (age at the time of death)...
May 5, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28503379/a-public-dataset-of-running-biomechanics-and-the-effects-of-running-speed-on-lower-extremity-kinematics-and-kinetics
#15
Reginaldo K Fukuchi, Claudiane A Fukuchi, Marcos Duarte
BACKGROUND: The goals of this study were (1) to present the set of data evaluating running biomechanics (kinematics and kinetics), including data on running habits, demographics, and levels of muscle strength and flexibility made available at Figshare (DOI: 10.6084/m9.figshare.4543435); and (2) to examine the effect of running speed on selected gait-biomechanics variables related to both running injuries and running economy. METHODS: The lower-extremity kinematics and kinetics data of 28 regular runners were collected using a three-dimensional (3D) motion-capture system and an instrumented treadmill while the subjects ran at 2...
2017: PeerJ
https://www.readbyqxmd.com/read/28502885/contra-lateral-bone-loss-at-the-distal-radius-in-postmenopausal-women-after-a-distal-radius-fracture-a-two-year-follow-up-hrpqct-study
#16
Joost J A de Jong, Jacobus J C Arts, Paul C Willems, Sandrine P G Bours, Judith P A Bons, Paul P C A Menheere, Bert van Rietbergen, Piet P Geusens, Joop P W van den Bergh
Opposite to the fracture side, bone mineral density (BMD) measured by DXA at the contra-lateral side does not change after a distal radius fracture. However, it is unknown if also bone micro-architecture and strength at the contralateral side are unaffected. Therefore, the aim of this study was to assess BMD, micro-architecture and bone mechanical properties at the contra-lateral side during two years follow-up after a distal radius fracture using high resolution peripheral quantitative computed tomography (HRpQCT)...
May 11, 2017: Bone
https://www.readbyqxmd.com/read/28502475/cyst-like-osteolytic-formations-in-recombinant-human-bone-morphogenetic-protein-2-rhbmp-2-augments-sheep-spinal-fusion
#17
Hsin Chuan Pan, Soonchul Lee, Kang Ting, Jia Shen, Chenchao Wang, Alan Nguyen, Emily A Berthiaume, Janette N Zara, A Simon Turner, Howard B Seim, Jin Hee Kwak, Xinli Zhang, Chia Soo
Multiple case reports using recombinant human bone morphogenetic protein-2 (rhBMP-2) have reported complications. However, the local adverse effects of rhBMP-2 application are not well documented. In this report we show that, in addition to promoting lumbar spinal fusion through potent osteogenic effects, rhBMP-2 augmentation promotes local cyst-like osteolytic formations in sheep trabecular bones that have undergone anterior lumbar interbody fusion. Three months after operation, conventional computed tomography showed that the trabecular bones of the rhBMP-2 application groups could fuse, whereas no fusion was observed in the control group...
May 11, 2017: American Journal of Pathology
https://www.readbyqxmd.com/read/28500954/finger-forces-in-fastball-baseball-pitching
#18
Hiroshi Kinoshita, Satoshi Obata, Daiki Nasu, Koji Kadota, Tomoyuki Matsuo, Glenn S Fleisig
Forces imparted by the fingers onto a baseball are the final, critical aspects for pitching, however these forces have not been quantified previously as no biomechanical technology was available. In this study, an instrumented baseball was developed for direct measurement of ball reaction force by individual fingers and used to provide fundamental information on the forces during a fastball pitch. A tri-axial force transducer with a cable having an easily-detachable connector were installed in an official baseball...
May 10, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28500910/ankle-strength-impairments-associated-with-knee-osteoarthritis
#19
Glaucia Helena Gonçalves, Francisco Alburquerque Sendín, Paula Regina Mendes da Silva Serrão, Luiz Fernando Approbato Selistre, Marina Petrella, Cristiano Carvalho, Stela Márcia Mattiello
BACKGROUND: Knee Osteoarthritis seems to negatively impact ankle biomechanics. However, the effect of knee osteoarthritis on ankle muscle strength has not been clearly established. This study aimed to evaluate the ankle strength of the plantar flexors and dorsiflexors of patients with knee osteoarthritis in different degrees of severity. METHODS: Thirty-seven patients with knee osteoarthritis and 15 controls, subjected to clinical and radiographic analysis, were divided into three groups: control, mild, and moderate knee osteoarthritis...
May 4, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28500771/large-animal-models-of-traumatic-brain-injury
#20
REVIEW
Robert Vink
Animal models are essential to gain a deeper understanding of the pathophysiology associated with traumatic brain injury (TBI). Rodent models of TBI have proven highly valuable with respect to the information they have provided over the years, particularly when it comes to the molecular understanding of injury mechanisms. However, there has been a failure to translate the successes in therapeutic treatment of TBI in rodents, which many believe may be related to their different brain anatomy compared with humans...
May 13, 2017: Journal of Neuroscience Research
keyword
keyword
51985
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"