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Biomechanic

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https://www.readbyqxmd.com/read/28723822/biomechanical-differences-in-female-basketball-and-soccer-players-during-multi-directional-jump-landings
#1
Jeffrey B Taylor, Kevin R Ford, Randy J Schmitz, Scott E Ross, Terry A Ackerman, Sandra J Shultz
Anterior cruciate ligament injury prevention programs are less successful in basketball than soccer and may be due to distinct movement strategies that these athletes develop from sport-specific training. The purpose of this study was to identify biomechanical differences between female basketball and soccer players during multi-directional jump landings. Lower extremity biomechanics of eighty-nine female athletes who played competitive basketball (n=40) or soccer (n=49) at the middle- or high-school level were analyzed with three-dimensional motion analysis during a drop vertical jump (DVJ), double- (SAG-DL) and single-leg forward jump (SAG-SL), and double- (FRONT-DL) and single-leg (FRONT-SL) lateral jump...
July 14, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28722467/the-influence-of-lower-extremity-lean-mass-on-landing-biomechanics-during-prolonged-exercise
#2
Melissa M Montgomery, Amanda J Tritsch, John R Cone, Randy J Schmitz, Robert Henson, Sandra J Shultz
CONTEXT:   The extent to which lower extremity lean mass (LELM) relative to total body mass influences one's ability to maintain safe landing biomechanics during prolonged exercise when injury incidence increases is unknown. OBJECTIVES:   To examine the influence of LELM on (1) pre-exercise lower extremity biomechanics and (2) changes in biomechanics during an intermittent exercise protocol (IEP) and (3) determine whether these relationships differ by sex. We hypothesized that less LELM would predict higher-risk baseline biomechanics and greater changes toward higher-risk biomechanics during the IEP...
July 19, 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/28721590/high-non-anatomic-tunnel-position-rates-in-acl-reconstruction-failure-using-both-transtibial-and-anteromedial-tunnel-drilling-techniques
#3
Vera Jaecker, Tabea Zapf, Jan-Hendrik Naendrup, Thomas Pfeiffer, Ajay C Kanakamedala, Arasch Wafaisade, Sven Shafizadeh
INTRODUCTION: Although it is well known from cadaveric and biomechanical studies that transtibial femoral tunnel (TT) positioning techniques are associated with non-anatomic tunnel positions, controversial data exist as so far no clinical differences could have been found, comparing transtibial with anteromedial techniques (AM). The purpose of the study was to analyze if graft failure following TT ACL reconstruction was more commonly associated with non-anatomic tunnel position in comparison with the AM technique...
July 18, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28721551/peri-implant-biomechanical-responses-to-standard-short-wide-and-double-mini-implants-replacing-missing-molar-supporting-hybrid-ceramic-or-full-metal-crowns-under-axial-and-off-axial-loading-an-in-vitro-study
#4
Lamiaa Said Elfadaly, Lamiaa Sayed Khairallah, Mona Atteya Al Agroudy
BACKGROUND: The aim of this study was to evaluate the biomechanical response of the peri-implant bone to standard, short-wide, and double mini implants replacing missing molar supporting either hybrid ceramic crowns (Lava Ultimate restorative) or full-metal crowns under two different loading conditions (axial and off-axial loading) using strain gauge analysis. METHODS: Three single-molar implant designs, (1) single, 3.8-mm (regular) diameter implant, (2) single, 5...
December 2017: International Journal of Implant Dentistry
https://www.readbyqxmd.com/read/28721517/vision-for-action-and-perception-elicit-dissociable-adherence-to-weber-s-law-across-a-range-of-graspable-target-objects
#5
Matthew Heath, Joseph Manzone, Michaela Khan, Shirin Davarpanah Jazi
A number of studies have reported that grasps and manual estimations of differently sized target objects (e.g., 20 through 70 mm) violate and adhere to Weber's law, respectively (e.g., Ganel et al. 2008a, Curr Biol 18:R599-R601)-a result interpreted as evidence that separate visual codes support actions (i.e., absolute) and perceptions (i.e., relative). More recent work employing a broader range of target objects (i.e., 5 through 120 mm) has laid question to this claim and proposed that grasps for 'larger' target objects (i...
July 18, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28721473/biomechanics-of-the-classic-metaphyseal-lesion-finite-element-analysis
#6
Andy Tsai, Brittany Coats, Paul K Kleinman
BACKGROUND: The classic metaphyseal lesion (CML) is strongly associated with infant abuse, but the biomechanics responsible for this injury have not been rigorously studied. Radiologic and CT-pathological correlates show that the distal tibial CML always involves the cortex near the subperiosteal bone collar, with variable extension of the fracture into the medullary cavity. Therefore, it is reasonable to assume that the primary site of bone failure is cortical, rather than intramedullary...
July 18, 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/28720431/biological-responses-to-immobilized-microscale-and-nanoscale-surface-topographies
#7
REVIEW
Shelby A Skoog, Girish Kumar, Roger J Narayan, Peter L Goering
Cellular responses are highly influenced by biochemical and biomechanical interactions with the extracellular matrix (ECM). Due to the impact of the ECM architecture on cellular responses, significant research has been dedicated towards developing biomaterials that mimic the physiological environment for design of improved medical devices. Surface topographies with microscale and nanoscale features have demonstrated an effect on numerous cellular responses including cell adhesion, migration, proliferation, gene expression, protein production, and differentiation; however, determining relationships between biological responses and surface topographies are difficult to establish due to differences in cell types and biomaterial surface properties...
July 15, 2017: Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/28720138/plantar-plate-pathology-is-associated-with-erosive-disease-in-the-painful-forefoot-of-patients-with-rheumatoid-arthritis
#8
Heidi J Siddle, Richard J Hodgson, Elizabeth M A Hensor, Andrew J Grainger, Anthony C Redmond, Richard J Wakefield, Philip S Helliwell
BACKGROUND: Disease-related foot pathology is recognised to have a significant impact on mobility and functional capacity in the majority of patients with rheumatoid arthritis (RA). The forefoot is widely affected and the metatarsophalangeal (MTP) joints are the most common site of symptoms. The plantar plates are the fibrocartilaginous distal attachments of the plantar fascia inserting into the five proximal phalanges. Together with the transverse metatarsal ligament they prevent splaying of the forefoot and subluxation of the MTP joints...
July 18, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28719995/biomechanics-of-the-proximal-radius-following-drilling-of-the-bicipital-tuberosity-to-mimic-cortical-button-distal-biceps-repair-technique
#9
Nikhil R Oak, John R Lien, Alexander Brunfeldt, Jeffrey N Lawton
BACKGROUND: A fracture through the proximal radius is a theoretical concern after cortical button distal biceps fixation in an active patient. The permanent, nonossified cortical defect and medullary tunnel is at risk during a fall eliciting rotational and compressive forces. We hypothesized that during simulated torsion and compression, in comparison with unaltered specimens, the cortical button distal biceps repair model would have decreased torsional and compressive strength and would fracture in the vicinity of the bicipital tuberosity bone tunnel...
March 1, 2017: Hand: Official Journal of the American Association for Hand Surgery
https://www.readbyqxmd.com/read/28719939/biomechanics-and-microstructural-analysis-of-the-mouse-knee-and-ligaments
#10
Camila B Carballo, Ian D Hutchinson, Zoe M Album, Michael J Mosca, Arielle Hall, Scott Rodeo, Liang Ying, Xiang-Hua Deng, Scott A Rodeo
No abstract text is available yet for this article.
July 18, 2017: Journal of Knee Surgery
https://www.readbyqxmd.com/read/28719806/effect-of-cage-design-supplemental-posterior-instrumentation-and-approach-on-primary-stability-of-a-lumbar-interbody-fusion-a-biomechanical-in-vitro-study
#11
Werner Schmoelz, Sabrina Sandriesser, Oded Loebl, Marlies Bauer, Dietmar Krappinger
BACKGROUND: There are various techniques and approaches for lumbar interbody fusion differing in access, cage type and type of supplemental posterior instrumentation. While a transforaminal access usually includes a hemifacetectomy, the facet joint can be preserved with a more lateral extraforaminal access. The supplemental posterior instrumentation required for both fusion techniques is still debated. The purpose of the present study was to compare primary stability of the two accesses for two different cage types with none, unilateral and bilateral supplemental posterior instrumentation...
July 8, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28719661/minimizing-endpoint-variability-through-reinforcement-learning-during-reaching-movements-involving-shoulder-elbow-and-wrist
#12
David Marc Anton Mehler, Alexandra Reichenbach, Julius Klein, Jörn Diedrichsen
Reaching movements are comprised of the coordinated action across multiple joints. The human skeleton is redundant for this task because different joint configurations can lead to the same endpoint in space. How do people learn to use combinations of joints that maximize success in goal-directed motor tasks? To answer this question, we used a 3-degree-of-freedom manipulandum to measure shoulder, elbow and wrist joint movements during reaching in a plane. We tested whether a shift in the relative contribution of the wrist and elbow joints to a reaching movement could be learned by an implicit reinforcement regime...
2017: PloS One
https://www.readbyqxmd.com/read/28719577/physical-limits-to-biomechanical-sensing-in-disordered-fibre-networks
#13
Farzan Beroz, Louise M Jawerth, Stefan Münster, David A Weitz, Chase P Broedersz, Ned S Wingreen
Cells actively probe and respond to the stiffness of their surroundings. Since mechanosensory cells in connective tissue are surrounded by a disordered network of biopolymers, their in vivo mechanical environment can be extremely heterogeneous. Here we investigate how this heterogeneity impacts mechanosensing by modelling the cell as an idealized local stiffness sensor inside a disordered fibre network. For all types of networks we study, including experimentally-imaged collagen and fibrin architectures, we find that measurements applied at different points yield a strikingly broad range of local stiffnesses, spanning roughly two decades...
July 18, 2017: Nature Communications
https://www.readbyqxmd.com/read/28719551/annulus-fibrosus-repair-using-high-density-collagen-gel-an-in-vivo-ovine-model
#14
Brenton Pennicooke, Ibrahim Hussain, Connor Berlin, Stephen R Sloan, Brandon Borde, Yu Moriguchi, Gernot Lang, Rodrigo Navarro-Ramirez, Jonathan Cheetham, Lawrence J Bonassar, Roger Härtl
STUDY DESIGN: Ovine in vivo study. OBJECTIVE: To perform lateral approach lumbar surgery in an ovine model to administer an injectable riboflavin (RF) cross-linked high-density collagen (HDC) gel and to assess its ability to mitigate intervertebral disc (IVD) degeneration after induced annulus fibrosus (AF) injury. SUMMARY OF BACKGROUND DATA: Biological-based injectable gels have shown efficacy in restoring biomechanical, radiographic, and histological parameters in IVD-injured animal models...
July 17, 2017: Spine
https://www.readbyqxmd.com/read/28718780/biarticular-elements-as-a-contributor-to-energy-efficiency-biomechanical-review-and-application-in-bio-inspired-robotics
#15
Karen Junius, Marta Moltedo, Pierre Cherelle, Carlos David Rodriguez-Guerrero, Bram Vanderborght, Dirk Lefeber
Despite the increased interest in exoskeleton research in the last decades, not much progress has been made on the successful reduction of user effort. In humans, biarticular elements have been identied as one of the reasons for the energy economy of locomotion. This document gives an extensive literature overview concerning the function of biarticular mus- cles in human beings. The exact role of these muscles in the efficiency of human locomotion is reduced to three elementary functions: energy transfer towards distal joints, efficient control of output force direction and double joint actuation...
July 18, 2017: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/28718314/techniques-of-force-and-pressure-measurement-in-the-small-joints-of-the-wrist
#16
Michael J Schreck, Meghan Kelly, Colin D Canham, John C Elfar
BACKGROUND: The alteration of forces across joints can result in instability and subsequent disability. Previous methods of force measurements such as pressure-sensitive films, load cells, and pressure-sensing transducers have been utilized to estimate biomechanical forces across joints and more recent studies have utilized a nondestructive method that allows for assessment of joint forces under ligamentous restraints. METHODS: A comprehensive review of the literature was performed to explore the numerous biomechanical methods utilized to estimate intra-articular forces...
February 1, 2017: Hand: Official Journal of the American Association for Hand Surgery
https://www.readbyqxmd.com/read/28718311/a-biomechanical-study-of-a-novel-asymmetric-6-strand-flexor-tendon-repair-using-porcine-tendons
#17
Yoke Rung Wong, Shian Chao Tay
BACKGROUND: This study evaluated the biomechanical performance of a novel asymmetric 6-strand flexor tendon repair technique without locking loops. METHODS: Twenty porcine flexor tendons were equally repaired by using the asymmetric technique and compared with the modified Lim-Tsai repair technique. The ultimate tensile strength, load to 1-mm gap force, stiffness, and mechanism of failure were measured. RESULTS: The asymmetric repair technique had significantly higher tensile strength (63...
January 1, 2017: Hand: Official Journal of the American Association for Hand Surgery
https://www.readbyqxmd.com/read/28718273/3d-quantitative-evaluation-of-spine-proprioceptive-perception-motor-control-through-instinctive-self-correction-manoeuvre-in-healthy-young-subjects-posture-an-observational-study
#18
Moreno D'Amico, Edyta Kinel, Piero Roncoletta
BACKGROUND: Conservative treatment in spine deformities and spine related disorders is mainly based on proper individual proprioceptive and motor control training. For these reasons, conservative treatment involves the stimulation of individual capability of perceiving/reducing deformities, blocks and/or improper spine posture by voluntary control. The literature describes that habitually adopted relaxed postures often exacerbate low back pain. Typically, youths can be referred to therapeutic programs aimed at improving the quality of body posture along with fostering the awareness of the importance of correct posture...
July 18, 2017: European Journal of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/28718007/-basic-principles-of-fracture-healing
#19
REVIEW
Valentin Rausch, Dominik Seybold, Matthias Königshausen, Manfred Köller, Thomas A Schildhauer, Jan Geßmann
BACKGROUND: In contrast to other tissues, bone has the remarkable ability to heal without scarring. After union of the fracture, the remodeled bone ideally does not differ from the original bone, especially in terms of biomechanical properties. The healing of a fracture resembles the embryonic development of bone. Depending on the biomechanical properties of the fracture, bone heals directly or indirectly, which refers to the formation of cartilage as a step before new bone appears...
July 17, 2017: Der Orthopäde
https://www.readbyqxmd.com/read/28717671/biomechanical-comparison-between-the-cruciate-suture-and-a-single-vertical-suture-used-for-arthroscopic-meniscal-repair-response
#20
Charles Milchteim, Eric A Branch, Ty Maughon, Jay Hughey, Adam W Anz
No abstract text is available yet for this article.
June 2017: Orthopaedic Journal of Sports Medicine
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