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ankle biomechanics

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https://www.readbyqxmd.com/read/28802431/ankle-restrictive-firefighting-boots-alter-the-lumbar-biomechanics-during-landing-tasks
#1
Vy Vu, Anthony Walker, Nick Ball, Wayne Spratford
Firefighters incur high incidences of lower back and body injuries. Firefighting boots, with specific design requirements, have been shown to reduce ankle range of motion. This reduction has been associated with impaired force dissipation and lower body kinematic alterations. Thus, the aim of this study was to determine the relationship between firefighting boots, lumbar biomechanics and load carriage during landing. Our data indicates that when wearing firefighting boots, lumbar forces increased and kinematics changed in frontal and transverse planes...
November 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28783473/heel-rise-height-deficit-1-year-after-achilles-tendon-rupture-relates-to-changes-in-ankle-biomechanics-6-years-after-injury
#2
Annelie Brorsson, Richard W Willy, Roy Tranberg, Karin Grävare Silbernagel
BACKGROUND: It is unknown whether the height of a heel-rise performed in the single-leg standing heel-rise test 1 year after an Achilles tendon rupture (ATR) correlates with ankle biomechanics during walking, jogging, and jumping in the long-term. PURPOSE: To explore the differences in ankle biomechanics, tendon length, calf muscle recovery, and patient-reported outcomes at a mean of 6 years after ATR between 2 groups that, at 1-year follow-up, had less than 15% versus greater than 30% differences in heel-rise height...
August 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28771113/active-ankle-circumduction-to-identify-mobility-deficits-in-sub-acute-ankle-sprain-patients
#3
Clément Theurillat, Ilona Punt, Stéphane Armand, Alice Bonnefoy-Mazure, Lara Allet
Assessment of ankle mobility is complex and of clinical relevance after an ankle sprain. This study develops and tests a biomechanical model to assess active ankle circumduction and its reliability. The model was then applied to compare individuals' ankle mobility between injured and non-injured ankles after a sprain episode. Twenty patients with sub-acute unilateral ankle sprain were assessed at 4 and 10 weeks after the injury. They underwent a clinical exam and an ankle circumduction test during which the kinematics were recorded with an optoelectronic device...
August 3, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28768339/habitual-minimalist-shod-running-biomechanics-and-the-acute-response-to-running-barefoot
#4
Nicholas Tam, Ian A J Darragh, Nikhil V Divekar, Robert P Lamberts
The aim of the study was to determine whether habitual minimalist shoe runners present with purported favorable running biomechanithat reduce running injury risk such as initial loading rate. Eighteen minimalist and 16 traditionally cushioned shod runners were assessed when running both in their preferred training shoe and barefoot. Ankle and knee joint kinetics and kinematics, initial rate of loading, and footstrike angle were measured. Sagittal ankle and knee joint stiffness were also calculated. Results of a two-factor ANOVA presented no group difference in initial rate of loading when participants were running either shod or barefoot; however, initial loading rate increased for both groups when running barefoot (p=0...
August 2, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28758422/biomechanical-study-of-screw-fixation-and-plate-fixation-of-a-posterior-malleolar-fracture-in-a-simulation-of-the-normal-gait-cycle
#5
Xu Wang, Jianwen Yin, Chao Zhang, Chen Wang, Xiang Geng, Xin Ma, Jiazhang Huang, Chengwei Wang, Xue Wang
BACKGROUND: Fixation of posterior malleolar fractures with plates or screws is under debate. A fatigue loading system and a spatial motion capture system were used in this study to evaluate a posterior malleolar fracture model. METHODS: Thirty-six below-knee specimens with a single posterolateral fragment (Haraguchi I) type posterior malleolar fracture models were randomly divided into 2 groups. Two parallel-placed 3.5-mm partially threaded titanium alloy screws were used in Group A to fix the fractures, while anatomical plates were used in Group B...
July 1, 2017: Foot & Ankle International
https://www.readbyqxmd.com/read/28757236/fiber-based-modeling-of-in-situ-ankle-ligaments-with-consideration-of-progressive-failure
#6
Bingbing Nie, Jason L Forman, Matthew B Panzer, Alexander R Mait, John-Paul Donlon, Richard W Kent
Ligament sprains account for a majority of injuries to the foot and ankle complex among athletic populations. The infeasibility of measuring the in situ response and load paths of individual ligaments has precluded a complete characterization of their mechanical behavior via experiment. In the present study a fiber-based modeling approach of in situ ankle ligaments was developed and validated for determining the heterogeneous force-elongation characteristics and the consequent injury patterns. Nine major ankle ligaments were modeled as bundles of discrete elements, corresponding functionally to the structure of collagen fibers...
July 18, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28755611/fixed-and-mobile-bearing-total-ankle-prostheses-effect-on-tibial-bone-strain
#7
Alexandre Terrier, Caroline Sieger Fernandes, Maïka Guillemin, Xavier Crevoisier
BACKGROUND: Total ankle replacement is associated to a high revision rate. To improve implant survival, the potential advantage of prostheses with fixed bearing compared to mobile bearing is unclear. The objective of this study was to test the hypothesis that fixed and mobile bearing prostheses are associated with different biomechanical quantities typically associated to implant failure. METHODS: With a validated finite element model, we compared three cases: a prosthesis with a fixed bearing, a prosthesis with a mobile bearing in a centered position, and a prosthesis with mobile bearing in an eccentric position...
July 19, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28754421/the-effect-of-visual-focus-on-spatio-temporal-and-kinematic-parameters-of-treadmill-running
#8
Ángel G Lucas-Cuevas, Jose I Priego Quesada, Josh Gooding, Martin G C Lewis, Alberto Encarnación-Martínez, Pedro Perez-Soriano
The characteristics of a treadmill and the environment where it is based could influence the user's gaze and have an effect on their running kinematics and lower limb impacts. The aim of this study was to identify the effect of visual focus on spatio-temporal parameters and lower limb kinematics during treadmill running. Twenty six experienced runners ran at 3.33ms(-1) on a treadmill under two visual conditions, either looking ahead at a wall or looking down at the treadmill visual display. Spatio-temporal parameters, impact accelerations of the head and tibia, and knee and ankle kinematics were measured for the final 15s of a 90s bout of running under each condition...
July 15, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28754420/identifying-changes-in-gait-waveforms-following-a-strengthening-intervention-for-women-with-knee-osteoarthritis-using-principal-components-analysis
#9
Elora C Brenneman, Monica R Maly
Lower limb strengthening exercise is pivotal for the management of symptoms related to knee osteoarthritis (OA). Though improvement in clinical symptoms is well documented, concurrent changes in gait biomechanics are ill-defined. This may occur because discrete analyses miss changes following an intervention, analyses limited to the knee undermine potential mechanical trade-offs at other joints, or strengthening interventions not been designed based on biomechanical principles. The purpose of this study was to characterize differences in entire gait waveforms for sagittal plane ankle, knee, and hip angles and external moments; the knee adduction moment; and frontal plane hip angle and moment following 12-weeks of a previously designed novel lower limb strengthening program...
July 11, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28751493/the-nervous-system-does-not-compensate-for-an-acute-change-in-the-balance-of-passive-force-between-synergist-muscles
#10
Lilian Lacourpaille, Antoine Nordez, François Hug
It is unclear how muscle activation strategies adapt to differential acute changes in the biomechanical characteristics between synergist muscles. This issue is fundamental to understanding the control of almost every joint in the body. The aim of this human experiment was to determine whether the relative activation of the heads of the triceps surae (Gastrocnemius medialis [GM], Gastrocnemius lateralis [GL] and Soleus [SOL]) compensates for differential changes in passive force between these muscles. Twenty-four participants performed isometric ankle plantarflexion at 20N...
July 27, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28750263/biomechanical-differences-between-cases-with-chronic-exertional-compartment-syndrome-and-asymptomatic-controls-during-walking-and-marching-gait
#11
Andrew Roberts, David Roscoe, David Hulse, Alexander N Bennett, Sharon Dixon
Chronic exertional compartment syndrome is a significant problem in military populations that may be caused by specific military activities. This study aimed to investigate the kinematic and kinetic differences in military cases with chronic exertional compartment syndrome and asymptomatic controls. 20 males with symptoms of chronic exertional compartment syndrome of the anterior compartment and 20 asymptomatic controls were studied. Three-dimensional lower limb kinematics and kinetics were compared during walking and marching...
July 18, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28747517/a-soft-robotic-exosuit-improves-walking-in-patients-after-stroke
#12
Louis N Awad, Jaehyun Bae, Kathleen O'Donnell, Stefano M M De Rossi, Kathryn Hendron, Lizeth H Sloot, Pawel Kudzia, Stephen Allen, Kenneth G Holt, Terry D Ellis, Conor J Walsh
Stroke-induced hemiparetic gait is characteristically slow and metabolically expensive. Passive assistive devices such as ankle-foot orthoses are often prescribed to increase function and independence after stroke; however, walking remains highly impaired despite-and perhaps because of-their use. We sought to determine whether a soft wearable robot (exosuit) designed to supplement the paretic limb's residual ability to generate both forward propulsion and ground clearance could facilitate more normal walking after stroke...
July 26, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/28747337/comparisons-of-external-fixator-combined-with-limited-internal-fixation-and-open-reduction-and-internal-fixation-for-sanders-type-2-calcaneal-fractures-finite-element-analysis-and-clinical-outcome
#13
M Pan, L Chai, F Xue, L Ding, G Tang, B Lv
OBJECTIVES: The aim of this study was to compare the biomechanical stability and clinical outcome of external fixator combined with limited internal fixation (EFLIF) and open reduction and internal fixation (ORIF) in treating Sanders type 2 calcaneal fractures. METHODS: Two types of fixation systems were selected for finite element analysis and a dual cohort study. Two fixation systems were simulated to fix the fracture in a finite element model. The relative displacement and stress distribution were analysed and compared...
July 2017: Bone & Joint Research
https://www.readbyqxmd.com/read/28745438/functional-donor-site-morbidity-longer-than-one-year-after-fibula-free-flap-a-prospective-biomechanical-analysis
#14
Carsten Rendenbach, Ashkan Rashad, Lara Hansen, Carsten Kohlmeier, Moritz L Dyck, Anna Suling, Alexandre T Assaf, Michael Amling, Max Heiland, Johannes Wikner, Bjoern Riecke, Kilian Kreutzer
OBJECTIVES: The fibula free flap is the workhorse procedure for osseous reconstruction. The objective of this study was to investigate long-term functional outcomes of the harvesting site. PATIENTS AND METHODS: About 19 patients (10 male, 9 female, mean age 58.1 years) were available for the long-term analysis 13-51 months after surgery. Jumping mechanography and balance testing on a ground force reaction plate (Leonardo Mechanograph GFRP) were performed before and surgery...
July 26, 2017: Microsurgery
https://www.readbyqxmd.com/read/28736080/the-effect-of-ankle-foot-orthosis-alignment-on-walking-in-individuals-treated-for-traumatic-lower-extremity-injuries
#15
Starr E Brown, Elizabeth Russell Esposito, Jason M Wilken
Limb salvage surgeries are performed to treat a variety of lower limb pathologies and traumatic injuries. Individuals who have undergone limb salvage surgeries may require an ankle foot orthosis (AFO) to compensate for limb impairments and restore walking ability. Understanding the effects of AFO design parameters on gait biomechanics is important to refine AFO prescription criteria. In this study sagittal plane kinematic and kinetic data, muscle activity and alignment preference were examined as individuals treated for traumatic lower extremity injuries (N=12) walked over level ground with Plantarflexed (PF), Neutral, and Dorsiflexed (DF) aligned AFOs...
July 5, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28721473/biomechanics-of-the-classic-metaphyseal-lesion-finite-element-analysis
#16
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/28713536/neuromuscular-taping-application-in-counter-movement-jump-biomechanical-insight-in-a-group-of-healthy-basketball-players
#17
Giuseppe Marcolin, Alessandro Buriani, Andrea Giacomelli, David Blow, Davide Grigoletto, Marco Gesi
Kinesiologic elastic tape is widely used for both clinical and sport applications although its efficacy in enhancing agonistic performance is still controversial. Aim of the study was to verify in a group of healthy basketball players whether a neuromuscular taping application (NMT) on ankle and knee joints could affect the kinematic and the kinetic parameters of the jump, either by enhancing or inhibiting the functional performance. Fourteen healthy male basketball players without any ongoing pathologies at upper limbs, lower limbs and trunk volunteered in the study...
June 24, 2017: European Journal of Translational Myology
https://www.readbyqxmd.com/read/28712544/the-effect-of-leg-dominance-and-landing-height-on-acl-loading-among-female-athletes
#18
Hossein Mokhtarzadeh, Katie Ewing, Ina Janssen, Chen-Hua Yeow, Nicholas Brown, Peter Vee Sin Lee
Female athletes are more prone to anterior cruciate ligament (ACL) injury. A neuromuscular imbalance called leg dominance may provide a biomechanical explanation. Therefore, the purpose of this study was to compare the side-to-side lower limb differences in movement patterns, muscle forces and ACL forces during a single-leg drop-landing task from two different heights. We hypothesized that there will be significant differences in lower limb movement patterns (kinematics), muscle forces and ACL loading between the dominant and non-dominant limbs...
July 26, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28708780/syndesmotic-ankle-fractures-a-systematic-review
#19
James D Michelson, Michael Wright, Michael Blankstein
OBJECTIVES: The diagnosis and treatment of syndesmotic ankle fractures is controversial. This systematic review was performed to clarify the current understanding addressing several clinical questions that arise in the treatment of such injuries DATA SOURCES:: The English language literature was searched using PubMed, EMBASE, and Web of Science. The search terms were "syndesmosis" or "syndesmotic" in combination with the terms "ankle fracture" or "fracture". The included dates were between 1967 and July 2015...
June 22, 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28704344/effects-of-altering-trunk-position-during-landings-on-patellar-tendon-force-and-pain
#20
Rodrigo Scattone Silva, Craig R Purdam, Angela M Fearon, Wayne A Spratford, Claire Kenneally-Dabrowski, Peter Preston, Fábio V Serrão, James E Gaida
PURPOSE: To verify the immediate effects of altering sagittal plane trunk position during jump-landings on lower limb biomechanics, patellar tendon force and pain of athletes with and without patellar tendinopathy. METHODS: Twenty-one elite male athletes were categorized into 3 groups, athletes with patellar tendinopathy (TG, n=7), asymptomatic athletes with patellar tendon abnormalities (AG, n=7) and asymptomatic athletes without tendon abnormalities (CG, n=7)...
July 12, 2017: Medicine and Science in Sports and Exercise
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