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Biomechanics gait

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https://www.readbyqxmd.com/read/28927643/a-combined-kinematic-and-kinetic-analysis-at-the-residuum-socket-interface-of-a-knee-disarticulation-amputee
#1
Jinghua Tang, Michael McGrath, Nick Hale, Liudi Jiang, Dan Bader, Piotr Laszczak, David Moser, Saeed Zahedi
The bespoke interface between a lower limb residuum and a prosthetic socket is critical for an amputee's comfort and overall rehabilitation outcomes. Analysis of interface kinematics and kinetics is important to gain full understanding of the interface biomechanics, which could aid clinical socket fit, rehabilitation and amputee care. This pilot study aims to investigate the dynamic correlation between kinematic movement and kinetic stresses at the interface during walking tests on different terrains. One male, knee disarticulation amputee participated in the study...
September 15, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28898105/gait-characteristics-associated-with-a-greater-increase-in-medial-knee-cartilage-t1%C3%AF-and-t2-relaxation-times-in-patients-undergoing-anterior-cruciate-ligament-reconstruction
#2
Hsiang-Ling Teng, Daniel Wu, Favian Su, Valentina Pedoia, Richard B Souza, C Benjamin Ma, Xiaojuan Li
BACKGROUND: Osteoarthritis of the medial tibiofemoral joint (MTFJ) is prevalent among patients undergoing anterior cruciate ligament reconstruction (ACLR). Magnetic resonance T1ρ and T2 relaxation times provide noninvasive methods to quantify early cartilage degeneration. Altered sagittal-plane gait biomechanics have been observed after ACLR, but their associations with longitudinal changes in MTFJ cartilage T1ρ and T2 remain unclear. Hypothesis/Purpose: To examine whether the peak knee flexion moment (KFM), knee flexion angle (KFA), and vertical ground-reaction force (vGRF) during gait are associated with prospective changes in medial tibiofemoral cartilage T1ρ and T2 in ACL-reconstructed knees and to compare these gait characteristics between patients undergoing ACLR and healthy control participants...
September 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28895759/validation-of-plantar-pressure-simulations-using-finite-and-discrete-element-modelling-in-healthy-and-diabetic-subjects
#3
W Aerts, A Scarton, F De Groote, A Guiotto, Z Sawacha, C Cobelli, J Vander Sloten, I Jonkers
Plantar pressure simulation driven by integrated 3D motion capture data, using both a finite element and a discrete element model, is compared for ten healthy and ten diabetic neuropathic subjects. The simulated peak pressure deviated on average between 16.7 and 34.2% from the measured peak pressure. The error in the position of the peak pressure was on average smaller than 4.2 cm. No method was more accurate than the other although statistical differences were found between them. Both techniques are thus complementary and useful tools to better understand the alteration of diabetic foot biomechanics during gait...
September 12, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28893285/estimates-of-individual-muscle-power-production-in-normal-adult-walking
#4
Ross A Bogey, Lee A Barnes
BACKGROUND: The purpose of this study was to determine the contribution of individual hip muscles to the net hip power in normal adult self-selected speed walking. A further goal was to examine each muscle's role in propulsion or support of the body during that task. METHODS: An EMG-to-force processing (EFP) model was developed which scaled muscle-tendon unit (MTU) force output to gait EMG. Active muscle power was defined as the product of MTU forces (derived from EFP) and that muscle's contraction velocity...
September 11, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28892671/kinematic-and-kinetic-gait-deviations-in-males-long-after-anterior-cruciate-ligament-reconstruction
#5
Giovanni Milandri, Mike Posthumus, T J Small, Adam Bothma, Willem van der Merwe, Reshma Kassanjee, Sudesh Sivarasu
BACKGROUND: Biomechanical deviations long (approx. 5years) after anterior cruciate ligament reconstruction have not been quantified in males, despite their distinct risk profile as compared to females. These deviations can indicate altered joint loading during chronic, repetitive motions. METHODS: Cross-sectional study, comparing kinematic and kinetic variables between 15 male anterior cruciate ligament reconstructed patients and 15 healthy controls. During walking and running gait, measurements were taken of impact dynamics, knee and hip sagittal plane angles and moments, and knee varus angles and adduction moments...
July 29, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28892670/the-influence-of-sex-and-obesity-on-gait-biomechanics-in-people-with-severe-knee-osteoarthritis-scheduled-for-arthroplasty
#6
K L Paterson, L Sosdian, R S Hinman, T V Wrigley, J Kasza, M Dowsey, P Choong, K L Bennell
BACKGROUND: Sex and body mass may influence knee biomechanics associated with poor total knee arthroplasty (TKA) outcomes for knee osteoarthritis (OA). This study aimed to determine if gait differed between men and women, and overweight and class I obese patients with severe knee OA awaiting TKA. METHODS: 34 patients with severe knee OA (average age 70.0 (SD 7.2) years, body mass index 30.3 (4.1kg/m(2))) were recruited from a TKA waiting list. Three-dimensional gait analysis was performed at self-selected walking speed...
September 5, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28889946/dynamic-balance-in-persons-with-multiple-sclerosis-who-have-a-falls-history-is-altered-compared-to-non-fallers-and-to-healthy-controls
#7
Alexander T Peebles, Adam P Bruetsch, Sharon G Lynch, Jessie M Huisinga
Around 60% of persons with multiple sclerosis (MS) experience falls, however the dynamic balance differences between those who fall and those who don't are not well understood. The purpose of this study is to identify distinct biomechanical features of dynamic balance during gait that are different between fallers with MS, non-fallers with MS, and healthy controls. 27 recurrent fallers with MS, 28 persons with MS with no falls history, and 27 healthy controls walked on a treadmill at their preferred speed for 3min...
September 1, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28888904/changes-in-biomechanical-risk-factors-for-knee-osteoarthritis-and-their-association-with-5-year-clinically-important-improvement-after-limb-realignment-surgery
#8
Trevor B Birmingham, Rebecca Moyer, Kristyn Leitch, Bert Chesworth, Dianne Bryant, Kevin Willits, Robert Litchfield, Peter J Fowler, J Robert Giffin
OBJECTIVE: To evaluate 5-year outcomes after lower limb realignment and test the hypothesis that surgery-induced changes in selected biomechanical risk factors for medial knee OA are associated with clinically important improvements. DESIGN: We prospectively evaluated patient-reported outcomes, full-limb standing radiographs and gait biomechanics before, 6 months (surgery-induced change) and 5 years after medial opening wedge high tibial osteotomy (HTO) in 170 patients (46...
September 6, 2017: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/28885156/the-vspa-foot-a-quasi-passive-ankle-foot-prosthesis-with-continuously-variable-stiffness
#9
Max K Shepherd, Elliott J Rouse
Most commercially available prosthetic feet do not exhibit a biomimetic torque-angle relationship, and are unable to modulate their mechanics to assist with other mobility tasks, such as stairs and ramps. In this work, we present a quasi-passive ankle-foot prosthesis with a customizable torque-angle curve and an ability to quickly modulate ankle stiffness between tasks. The customizable torque-angle curve is obtained with a cam-based transmission and a fiberglass leaf spring. To achieve variable stiffness, the leaf spring's support conditions can be actively modulated by a small motor, shifting the torque-angle curve to be more or less stiff...
September 7, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28882330/combining-muscle-synergies-and-biomechanical-analysis-to-assess-gait-in-stroke-patients
#10
Filipe O Barroso, Diego Torricelli, Francisco Molina-Rueda, Isabel M Alguacil-Diego, Roberto Cano-de-la-Cuerda, Cristina Santos, Juan C Moreno, Juan C Miangolarra-Page, José L Pons
The understanding of biomechanical deficits and impaired neural control of gait after stroke is crucial to prescribe effective customized treatments aimed at improving walking function. Instrumented gait analysis has been increasingly integrated into the clinical practice to enhance precision and inter-rater reliability for the assessment of pathological gait. On the other hand, the analysis of muscle synergies has gained relevance as a novel tool to describe the neural control of walking. Since muscle synergies and gait analysis capture different but equally important aspects of walking, we hypothesized that their combination can improve the current clinical tools for the assessment of walking performance...
August 20, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28877943/systematic-review-of-the-evidence-on-orthotic-devices-for-the-management-of-knee-instability-related-to-neuromuscular-and-central-nervous-system-disorders
#11
Catriona McDaid, Debra Fayter, Alison Booth, Joanne O'Connor, Rocio Rodriguez-Lopez, Dorothy McCaughan, Roy Bowers, Cynthia P Iglesias, Simon Lalor, Rory J O'Connor, Margaret Phillips, Gita Ramdharry
OBJECTIVES: To assess the effectiveness of orthotic devices for the management of instability of the knee in adults with a neuromuscular disorder or central nervous system disorder. DESIGN: A systematic review of primary studies. SETTING: Community. PARTICIPANTS: Adults with a neuromuscular disorder or central nervous system disorder and impaired walking ability due to instability of the knee. INTERVENTIONS: Orthoses with the clinical aim of controlling knee instability, for example, knee-ankle-foot orthoses, ankle-foot orthoses and knee orthoses or mixed design with no restrictions in design or material...
September 5, 2017: BMJ Open
https://www.readbyqxmd.com/read/28875768/measuring-balance-confidence-after-spinal-cord-injury-the-reliability-and-validity-of-the-activities-specific-balance-confidence-scale
#12
Garima Shah, Alison R Oates, Tarun Arora, Joel L Lanovaz, Kristin E Musselman
Context/Objective The study objectives were to evaluate the test-retest reliability, convergent validity, and discriminative validity of the Activities-specific Balance Confidence (ABC) scale in individuals with incomplete spinal cord injury (iSCI). Design Prospective, cross-sectional study. Setting Laboratory. Participants Twenty-six community-dwelling individuals with chronic iSCI (20 males, 59.7 + 18.9 years old) and 26 age- and sex-matched able-bodied (AB) individuals participated. Interventions None. Outcome Measures Measures of balance and gait were collected over two days...
September 6, 2017: Journal of Spinal Cord Medicine
https://www.readbyqxmd.com/read/28874728/unpredictability-of-escape-trajectory-explains-predator-evasion-ability-and-microhabitat-preference-of-desert-rodents
#13
Talia Y Moore, Kimberly L Cooper, Andrew A Biewener, Ramanarayan Vasudevan
Mechanistically linking movement behaviors and ecology is key to understanding the adaptive evolution of locomotion. Predator evasion, a behavior that enhances fitness, may depend upon short bursts or complex patterns of locomotion. However, such movements are poorly characterized by existing biomechanical metrics. We present methods based on the entropy measure of randomness from Information Theory to quantitatively characterize the unpredictability of non-steady-state locomotion. We then apply the method by examining sympatric rodent species whose escape trajectories differ in dimensionality...
September 5, 2017: Nature Communications
https://www.readbyqxmd.com/read/28869903/biomechanical-differences-between-cases-with-suspected-chronic-exertional-compartment-syndrome-and-asymptomatic-controls-during-running
#14
Andrew Roberts, David Roscoe, David Hulse, Alexander N Bennett, Sharon Dixon
Chronic exertional compartment syndrome (CECS) has been hypothesised, following clinical observations, to be the result of abnormal biomechanics predominantly at the ankle. Treatment of CECS through running re-education to correct these abnormalities has been reported to improve symptoms. However no primary research has been carried out to investigate the movement patterns of those with CECS. This study aimed to compare the running kinematics and muscle activity of cases with CECS and asymptomatic controls...
August 30, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28866303/fuzzy-inference-model-evaluating-turn-for-parkinson-s-disease-patients
#15
Christopher Ornelas-Vences, Luis Pastor Sanchez-Fernandez, Luis Alejandro Sanchez-Perez, Alejandro Garza-Rodriguez, Albino Villegas-Bastida
Parkinson's disease is a chronic illness that affects motor skills. The Unified Parkinson's Disease Rating Scale sponsored by the Movement Disorder Society (MDS-UPDRS) quantifies the current state of the disease based on clinician's observations. In this scale, turning is part of the gait assessment, yet specific guidelines on which features to observe and rate are still unclear. What is more, only visual impairment detection is used as the main subjective rating tool. In this respect, four biomechanical features are extracted from sensors worn on the lower limbs in this work...
August 30, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28865708/computational-stability-of-human-knee-joint-at-early-stance-in-gait-effects-of-muscle-coactivity-and-anterior-cruciate-ligament-deficiency
#16
M Sharifi, A Shirazi-Adl, H Marouane
As one of the most complex and vulnerable structures of body, the human knee joint should maintain dynamic equilibrium and stability in occupational and recreational activities. The evaluation of its stability and factors affecting it is vital in performance evaluation/enhancement, injury prevention and treatment managements. Knee stability often manifests itself by pain, hypermobility and giving-way sensations and is usually assessed by the passive joint laxity tests. Mechanical stability of both the human knee joint and the lower extremity at early stance periods of gait (0% and 5%) were quantified here for the first time using a hybrid musculoskeletal model of the lower extremity...
August 20, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28865395/factors-influencing-knee-adduction-moment-measurement-a-systematic-review-and-meta-regression-analysis
#17
REVIEW
Scott Telfer, Moritz J Lange, Amanda S M Sudduth
The external knee adduction moment has been identified as a key biomarker in biomechanics research, with associations with this variable and degenerative diseases such as knee osteoarthritis. Heterogeneity in participant characteristics and the protocols used to measure this variable may however complicate its interpretation. Previous reviews have focused on interventions or did not control for potential moderator variables in their analysis. In this meta-regression analysis, we aimed to determine the influence of factors including the cohort type, footwear, and walking speed on the measurement of knee adduction moment...
August 24, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28844614/responsiveness-of-gait-analysis-parameters-in-a-cohort-of-71-cmt-subjects
#18
Tiziana Lencioni, Giuseppe Piscosquito, Marco Rabuffetti, Gabriele Bovi, Enrica Di Sipio, Manuela Diverio, Isabella Moroni, Luca Padua, Emanuela Pagliano, Angelo Schenone, Davide Pareyson, Maurizio Ferrarin
Detection of worsening in the slowly progressive Charcot-Marie-Tooth disease (CMT) is difficult. As previous clinical scales showed low responsiveness, novel outcome measures are under study, including innovative approaches such as quantitative muscle MRI and instrumented movement analysis. Since gait analysis proved able to reliably quantify CMT locomotor deficits, we aimed to explore whether it can be a sensitive-to-change outcome measure in CMT studies. Clinical and biomechanical evaluations were performed in 71 CMT subjects at baseline and after a mean (±sd) of 28...
July 14, 2017: Neuromuscular Disorders: NMD
https://www.readbyqxmd.com/read/28840674/-case-report-comprehensive-treatment-of-forefoot-with-double-brachymetatarsia-in-one-surgical-stage
#19
I Caldiño-Lozada, O Gallegos-de la Torre, R Esperón-Hernández
Brachymetatarsia (shortening of the metatarsal) directly affects the transversal arch of the foot causing severe deformities, such as hallux valgus, divergent toes, overlapping toes, metatarsalgia, all of these alter the biomechanics of the foot and gait. Treatment consists of two main techniques, one-stage lengthening with bone graft or elongation through callotaxis with external fixator; there are variants of both techniques used to minimize the disadvantages of each. The objective of treatment must be to return the structural harmony to the forefoot, improving the biomechanics, resulting in a satisfactory outcome for the patients...
March 2017: Acta Ortopédica Mexicana
https://www.readbyqxmd.com/read/28840671/-treatment-for-charcot-arthropathy-five-year-follow-up
#20
I Caldiño-Lozada, D Rojas-Osorio, R Esperón-Hernández
INTRODUCTION: Charcot arthropathy is a deformity which alters foot biomechanics and generate bichemical reactions that affect articular joints and bone. The natural history shown us a prevalence on 1% and is classified by Eichenholtz and Simmons modification in four stages; Sanders describe its location in 5 specific areas. MATERIAL AND METHODS: Our goal was to evaluate the specific method of treatment depending in the different stages of the deformity according to the literature review and to our proposed algoritm...
March 2017: Acta Ortopédica Mexicana
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