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Biomechanics gait

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https://www.readbyqxmd.com/read/28437757/abnormal-loading-and-functional-deficits-are-present-in-both-limbs-before-and-after-unilateral-knee-arthroplasty
#1
A J Metcalfe, C J Stewart, N J Postans, P R Biggs, G M Whatling, C A Holt, A P Roberts
Unilateral knee replacement is often followed by a contralateral replacement in time and the biomechanics of the other knee before and after knee replacement remains poorly understood. The aim of this paper is to distinguish the features of arthritic gait in the affected and unaffected legs relative to a normal population and to assess the objective recovery of gait function post-operatively, with the aim of defining patients at risk of poor post-operative function. Twenty patients with severe knee OA but no pain or deformity in any other lower limb joint were compared to twenty healthy subjects of the same age...
April 4, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28437567/people-with-patellofemoral-oa-walk-with-different-pelvic-and-hip-kinematics-compared-to-healthy-aged-matched-controls
#2
Kay M Crossley, Anthony G Schache, Hannah Ozturk, Jonathan Lentzos, Melissa Munanto, Marcus G Pandy
Objective, Patellofemoral joint (PFJ) osteoarthritis (OA) is common, yet little is known about how this condition influences lower-limb biomechanical function. This study compared pelvis and lower-limb kinematics in people with and without PFJOA., Methods, Sixty-nine participants (64% women, mean age 56±10 years) with anterior knee pain aggravated by PFJ loaded activities (stair ambulation, rising from sitting, squatting) and radiographic lateral PFJOA on skyline radiographs were compared with 18 controls (78% women, mean age 53±7 years) with no lower-limb pain or radiographic OA...
April 24, 2017: Arthritis Care & Research
https://www.readbyqxmd.com/read/28436878/biofeedback-for-gait-retraining-based-on-real-time-estimation-of-tibiofemoral-joint-contact-forces
#3
Claudio Pizzolato, Monica Reggiani, David J Saxby, Elena Ceseracciu, Luca Modenese, David G Lloyd
Biofeedback assisted rehabilitation and intervention technologies have the potential to modify clinically relevant biomechanics. Gait retraining has been used to reduce the knee adduction moment, a surrogate of medial tibiofemoral joint loading often used in knee osteoarthritis research. In this study we present an electromyogram-driven neuromusculoskeletal model of the lower-limb to estimate, in real-time, the tibiofemoral joint loads. The model included 34 musculotendon units spanning the hip, knee, and ankle joints...
April 18, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28433387/how-do-rocker-soled-shoes-influence-the-knee-adduction-moment-in-people-with-knee-osteoarthritis-an-analysis-of-biomechanical-mechanisms
#4
Elizabeth G Madden, Crystal O Kean, Tim V Wrigley, Kim L Bennell, Rana S Hinman
The primary objective was to examine mechanisms behind previously observed changes in the knee adduction moment (KAM) with rocker-soled shoes, in participants sub-grouped according to whether they experienced an immediate decrease, or increase, in peak KAM. In subgroups where frontal plane knee ground reaction force (GRF) lever-arm emerged as a significant predictor, a secondary aim was to examine biomechanical factors that contributed to change in this parameter. Thirty individuals with symptomatic, radiographic knee osteoarthritis (OA) underwent 3D gait analysis in unstable rocker-soled shoes and non-rocker-soled shoes...
April 9, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28422559/the-influence-of-ambulatory-aid-on-lower-extremity-muscle-activation-during-gait
#5
Michael Sanders, Anton E Bowden, Spencer Baker, Ryan Jensen, McKenzie Nichols
CONTEXT: Foot and ankle injuries are common, and often require a non-weight bearing period of immobilization for the involved leg. This non-weight bearing period usually results in muscle atrophy for the involved leg. There is a dearth of objective data describing muscle activation for different ambulatory aids that are used during the aforementioned non-weight bearing period. OBJECTIVE: To compare activation amplitudes for four leg muscles during (1) able-bodied gait and (2) ambulation involving three different ambulatory aids that can be used during the acute phase of foot and ankle injury care...
April 19, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28411958/effects-of-step-length-and-step-frequency-on-lower-limb-muscle-function-in-human-gait
#6
Yoong Ping Lim, Yi-Chung Lin, Marcus G Pandy
The aim of this study was to quantify the effects of step length and step frequency on lower-limb muscle function in walking. Three-dimensional gait data were used in conjunction with musculoskeletal modeling techniques to evaluate muscle function over a range of walking speeds using prescribed combinations of step length and step frequency. The body was modeled as a 10-segment, 21-degree-of-freedom skeleton actuated by 54 muscle-tendon units. Lower-limb muscle forces were calculated using inverse dynamics and static optimization...
March 21, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28411486/the-effect-of-age-and-knee-osteoarthritis-on-muscle-activation-patterns-and-knee-joint-biomechanics-during-dual-belt-treadmill-gait
#7
Derek Rutherford, Matthew Baker, Ivan Wong, William Stanish
PURPOSE: To compare a group of individuals with moderate medial compartment knee osteoarthritis (OA) to both an age-matched asymptomatic group of older adults and younger adults to determine whether differences in knee joint muscle activation patterns and joint biomechanics exist during gait between these three groups. SCOPE: 20 young adults, 20 older adults, and 40 individuals with moderate knee OA were recruited. Using standardized procedures, surface electromyograms were recorded from the vastus lateralis and medialis, rectus femoris and the medial and lateral hamstrings...
April 7, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28410535/spinal-kinematics-during-gait-in-healthy-individuals-across-different-age-groups
#8
Stefan Schmid, Björn Bruhin, Dominika Ignasiak, Jacqueline Romkes, William R Taylor, Stephen J Ferguson, Reinald Brunner, Silvio Lorenzetti
Most studies investigating trunk kinematics have not provided adequate quantification of spinal motion, resulting in a limited understanding of the healthy spine's biomechanical behavior during gait. This study aimed at assessing spinal motion during gait in adolescents, adults and older individuals. Fourteen adolescents (10-18years), 13 adults (19-35years) and 15 older individuals (≥65years) were included. Using a previously validated enhanced optical motion capture approach, sagittal and frontal plane spinal curvature angles and general trunk kinematics were measured during shod walking at a self-selected normal speed...
April 11, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28410094/stiffness-perception-during-active-ankle-and-knee-movement
#9
Alejandro F Azocar, Elliott J Rouse
OBJECTIVE: Recently, human joint impedance-the instantaneous mechanical response to a perturbation-has been quantified during gait, providing new insight beyond the traditional biomechanical descriptions of kinetics and kinematics. However, the role of joint impedance in neuromotor control and the development of exoskeletons and other wearable robotic systems remains unknown. One approach to studying the role of impedance in neuromotor control involves characterizing the human ability to discriminate changes in external impedance properties...
April 6, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28401818/-analysing-gait-in-the-gp-s-consulting-room
#10
T van Meulenbroek, I P J Huijnen, G H H Meys, G M Rommers
Gait disorders are often seen in the general practitioner (GP)'s consulting room. Orthopaedic or neurological problems may lead to abnormalities in gait. A careful analysis is important to advice or refer the patient for additional diagnostics or treatment. Basic gait analysis can be performed on any patient by applying a systematic stepwise observation. This is illustrated here by three case reports. This observation starts by looking at parameters such as walking speed, safety, efficiency etc. Analysis of biomechanical pattern such as step frequency, stride length and a detailed analysis of the different joint movements during the stance and swing phase can subsequently be performed...
2017: Nederlands Tijdschrift Voor Geneeskunde
https://www.readbyqxmd.com/read/28399935/prospective-clinical-study-of-rehabilitation-interventions-with-multisensory-interactive-training-in-patients-with-cerebral-infarction-study-protocol-for-a-randomised-controlled-trial
#11
Wai Leung Ambrose Lo, Yu Rong Mao, Le Li, Ai Hua Lin, Jiang Li Zhao, Ling Chen, Qiang Lin, Hai Li, Dong Feng Huang
BACKGROUND: Multisensory interactive training has an increasingly prominent role in stroke rehabilitation. Currently, there is insufficient evidence to demonstrate its efficacy on gait improvement, upper limb and lower limb functional improvement, global motor function and cognitive improvement. A recent Cochrane review confirmed that published studies on virtual reality (VR) training have the limitations of lack of powered sample size, did not evaluate the benefits over a long-term period and lacked trial quality on cognitive function...
April 11, 2017: Trials
https://www.readbyqxmd.com/read/28399722/safety-and-function-of-a-prototype-microprocessor-controlled-knee-prosthesis-for-low-active-transfemoral-amputees-switching-from-a-mechanic-knee-prosthesis-a-pilot-study
#12
Timothy Hasenoehrl, Thomas Schmalz, Reinhard Windhager, Stephan Domayer, Sara Dana, Clemens Ambrozy, Stefano Palma, Richard Crevenna
PURPOSE: Aim of this pilot study was to assess safety and functioning of a microprocessor-controlled knee prosthesis (MPK) after a short familiarization time and no structured physical therapy. MATERIALS AND METHODS: Five elderly, low-active transfemoral amputees who were fitted with a standard non-microprocessor controlled knee prosthesis (NMPK) performed a baseline measurement consisting of a 3 D gait analysis, functional tests and questionnaires. The first follow-up consisted of the same test procedure and was performed with the MPK after 4 to 6 weeks of familiarization...
April 11, 2017: Disability and Rehabilitation. Assistive Technology
https://www.readbyqxmd.com/read/28395170/the-effects-of-walking-speed-on-upper-body-kinematics-during-gait-in-healthy-subjects
#13
Jacqueline Romkes, Katrin Bracht-Schweizer
Patients undergoing a clinical gait analysis often walk slower than healthy people. However, data on how speed affects upper body movements, especially of the arms and shoulders, are scarce. Therefore, in this descriptive study, we examined how changes in walking speed affect upper-body kinematics and aspects of intersegmental coordination between upper and lower body during overground walking in a group of healthy adult subjects. Three-dimensional gait data were collected on 20 healthy subjects (aged between 22 and 31 years) walking at six speeds ranging from extremely slow to very fast...
March 24, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28393680/wheeled-assistive-device-for-load-carriage-the-effects-on-human-gait-and-biomechanics
#14
Itay Ketko, Meir Plotnik, Ran Yanovich, Amit Gefen, Yuval Heled
Soldiers are often required to carry loads which impose biomechanical strain on the human body. This can adversely affect physical performances. Recently, wheel-based devices (WBD) were designed to reduce the load on the soldier. In the present study, a prototype of this newly developed WBD was evaluated. Thirteen volunteers performed three exercise protocols on a treadmill as follows: (1) no load; (2) carrying 40% of their bodyweight with a backpack or; (3) with the WBD. Data acquisition included: gait parameters, vertical ground reaction forces (VGRF) and contact pressure acting on the shoulder...
April 10, 2017: Ergonomics
https://www.readbyqxmd.com/read/28376828/all-polyethylene-tibial-components-in-distal-femur-limb-salvage-surgery-a-finite-element-analysis-based-on-promising-clinical-outcomes
#15
Fan Tang, Yong Zhou, Wenli Zhang, Li Min, Rui Shi, Yi Luo, Hong Duan, Chongqi Tu
BACKGROUND: Whether all-polyethylene tibial (APT) components are beneficial to patients who received distal femur limb-salvage surgery lacks high-quality clinical follow-up and mechanical evidence. This study aimed to investigate the biomechanics of the distal femur reconstructed with APT tumor knee prostheses using finite element (FE) analysis based on our previous, promising clinical outcome. METHODS: Three-dimensional FE models that use APT and metal-backed tibial (MBT) prostheses to reconstruct distal femoral bone defects were developed and input into the Abaqus FEA software version 6...
April 4, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/28369965/canine-cranial-cruciate-ligament-deficient-stifle-biomechanics-associated-with-extra-articular-stabilization-predicted-using-a-computer-model
#16
Nathan P Brown, Gina E Bertocci, Denis J Marcellin-Little
OBJECTIVE: To evaluate lateral fabellotibial suture (LFTS) and TightRope CCL (TR) extra-articular stabilization biomechanics in the cranial cruciate ligament (CrCL)-deficient canine stifle joint during the stance phase of gait. STUDY DESIGN: Computer simulations. ANIMALS: Healthy 33-kg Golden Retriever. METHODS: LFTS and TR were implemented in a previously developed 3-D quasi-static rigid body CrCL-deficient canine pelvic limb computer model simulating the stance phase of gait...
April 1, 2017: Veterinary Surgery: VS
https://www.readbyqxmd.com/read/28362631/the-undulatory-swimming-gait-of-elongated-swimmers-revisited
#17
Gil Iosilevskii
An undulatory swimming gait is characterized by short lateral displacement waves that propagate backwards along the body of the swimmer faster than it swims. Hydrodynamic theory of elongated bodies predicts that if the amplitude of the displacement waves does not increase toward the caudal end, the part of the swimmer posteriad of the dorso-ventrally widest point takes no part in propulsion. It also predicts that if the amplitude does increase, then the hydrodynamic propulsion efficiency suffers. Cusk eels have their widest point located in the anterior half of the body with the bulk of their locomotive muscles located posteriad of it; indeed, they swim so that the amplitude of the propulsion wave increases toward the caudal end...
March 31, 2017: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/28361018/spinal-alignment-evolution-with-age-a-prospective-gait-analysis-study
#18
Sébastien Pesenti, Benjamin Blondel, Emilie Peltier, Elke Viehweger, Vincent Pomero, Guillaume Authier, Stéphane Fuentes, Jean-Luc Jouve
AIM: To describe, using gait analysis, the development of spinal motion in the growing child. METHODS: Thirty-six healthy children aged from 3 to 16 years old were included in this study for a gait analysis (9 m-walk). Various kinematic parameters were recorded and analyzed such as thoracic angle (TA), lumbar angle (LA) and sagittal vertical axis (SVA). The kinetic parameters were the net reaction moments (N.m/kg) at the thoracolumbar and lumbosacral junctions. RESULTS: TA and LA curves were not statistically correlated to the age (respectively, P = 0...
March 18, 2017: World Journal of Orthopedics
https://www.readbyqxmd.com/read/28355209/coefficients-of-variation-of-ground-reaction-force-measurement-in-cats
#19
Eva Schnabl-Feichter, Alexander Tichy, Barbara Bockstahler
Gait analysis has been extensively performed in dogs and horses; however, very little is known about feline biomechanics. It was, therefore, the aim of this study to determine the coefficient of variation (CV) among three ground reaction force (GRF) measurements taken for 15 client-owned European shorthaired cats without a training period and a short acclimatisation time. Gait was measured as each cat walked across a pressure-sensitive walkway, and measurements were made three times over a multi-week period (range: 2 to 17 weeks)...
2017: PloS One
https://www.readbyqxmd.com/read/28350286/head-and-trunk-control-while-walking-in-older-adults-with-diabetes-effects-of-balance-confidence
#20
Patricia Hewston, Nandini Deshpande
Investigations of gait in older adults with diabetes mellitus (DM) have been primarily focused on lower limb biomechanical parameters. Yet, the upper body accounts for two thirds of the body's mass, and head and trunk control are critical for balance. The authors examined head and trunk control during self-selected comfortable, fast, and dual-task walking and the relationship between balance confidence and potential head-trunk stiffening strategies in older adults with DM without diagnosed diabetic peripheral neuropathy (DPN)...
March 28, 2017: Journal of Motor Behavior
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