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https://www.readbyqxmd.com/read/29150344/biomechanical-mechanism-of-lateral-trunk-lean-gait-for-knee-osteoarthritis-patients
#1
Kazuki Tokuda, Masaya Anan, Makoto Takahashi, Tomonori Sawada, Kenji Tanimoto, Nobuhiro Kito, Koichi Shinkoda
The biomechanical mechanism of lateral trunk lean gait employed to reduce external knee adduction moment (KAM) for knee osteoarthritis (OA) patients is not well known. This mechanism may relate to the center of mass (COM) motion. Moreover, lateral trunk lean gait may affect motor control of the COM displacement. Uncontrolled manifold (UCM) analysis is an evaluation index used to understand motor control and variability of the motor task. Here we aimed to clarify the biomechanical mechanism to reduce KAM during lateral trunk lean gait and how motor variability controls the COM displacement...
November 4, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29149623/the-effect-of-surgical-approach-on-gait-mechanics-after-total-hip-arthroplasty
#2
Joseph Zeni, Kathleen Madara, Hunter Witmer, Riley Gerhardt, James Rubano
BACKGROUND: Few studies have compared the biomechanical outcomes of different surgical approaches for hip arthroplasty. The purpose of this study was to compare hip, pelvic, and trunk kinematics and kinetics between individuals who underwent a posterior or anterolateral approach. METHODS: Forty-five individuals between 40 and 80 years old underwent motion analysis during overground gait prior to hip arthroplasty and 3 months after surgery. Walking speed, hip flexion angle, hip extension angle, adduction angle and moment, trunk angle, trunk lean, and pelvis drop were compared between approaches...
November 10, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/29140159/athletes-rated-as-poor-single-leg-squat-performers-display-measureable-differences-in-single-leg-squat-biomechanics-compared-to-good-performers
#3
Lachlan E Garrick, Bryce C Alexander, Anthony G Schache, Marcus G Pandy, Kay M Crossley, Natalie J Collins
CONTEXT: It is important to validate single-leg squat visual rating criteria used in clinical practice and research. Foot orthoses may improve single-leg squat performance in those who demonstrate biomechanics associated with increased risk of lower-limb injury. OBJECTIVE: Validate visual rating criteria proposed by Crossley et al, by determining whether athletes rated as poor single-leg squat performers display different single-leg squat biomechanics than good performers; and evaluate immediate effects of foot orthoses on single-leg squat biomechanics in poor performers...
November 15, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/29139576/effects-of-lateral-offset-sole-shoes-on-knee-adduction-moment-in-women-with-medial-compartment-knee-osteoarthritis
#4
Woo Young Jang, Hae Woon Jung, Gi Won Choi, Hyun Min Lee, Hae Soo Park, Soon Hyuck Lee
This study aimed to determine the impact of wearing a lateral-offset sole shoe (LOSS) on knee adduction moment (KAM) in patients with medial knee osteoarthritis (OA). From December 2012 to November 2016, patients with medial knee OA were recruited. Ninety-three knees (50 left, 43 right) of 93 female patients were analyzed. The first peak KAMs were measured with patients 1) walking barefoot, 2) walking in conventional shoes, and 3) walking in LOSSs. The patients had grade 1 (n=19), grade 2 (n=49), grade 3 (n=20), and grade 4 (n=5) knee OA...
November 15, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29128508/relative-and-absolute-test-retest-reliabilities-of-biomechanical-risk-factors-for-knee-osteoarthritis-progression-benchmarks-for-meaningful-change
#5
Nicholas M Brisson, Paul W Stratford, Monica R Maly
OBJECTIVE: Biomechanical factors are important treatment targets in knee osteoarthritis. The knee adduction (KAM) and flexion (KFM) moments, quadriceps strength and power, load frequency, and body mass index (BMI) all have the potential to affect knee articular cartilage integrity by modulating forces across the joint. To identify clinically meaningful change, however, these measurements must be reliable and sensitive to change. This study estimated relative and absolute test-retest reliabilities over long periods of biomechanical risk factors for knee osteoarthritis progression...
November 8, 2017: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/29128507/moderators-and-mediators-of-effects-of-unloading-shoes-on-knee-pain-in-people-with-knee-osteoarthritis-an-exploratory-analysis-of-the-shark-randomised-controlled-trial
#6
Kade L Paterson, Jessica Kasza, Kim L Bennell, Tim V Wrigley, Ben R Metcalf, Penny K Campbell, David J Hunter, Rana S Hinman
OBJECTIVE: To investigate moderators and biomechanical mediators of effects of unloading shoes on knee pain in people with knee osteoarthritis (OA). METHODS: Exploratory analysis from 164 participants in a clinical trial comparing unloading (ASICS GEL-Melbourne OA) to conventional walking shoes. The primary outcome was 6-month change in knee pain (11-point numerical rating scale). Moderators included baseline peak knee adduction moment (KAM), radiographic severity (Kellgren & Lawrence (KL) scale), body mass, foot posture, neuropathic pain and diffuse knee pain...
November 8, 2017: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/29125920/frontal-plane-knee-mechanics-and-early-cartilage-degeneration-in-people-with-anterior-cruciate-ligament-reconstruction-a-longitudinal-study
#7
Deepak Kumar, Favian Su, Daniel Wu, Valentina Pedoia, Lauren Heitkamp, C Benjamin Ma, Richard B Souza, Xiaojuan Li
BACKGROUND: Abnormal frontal plane gait mechanics are known risk factors for knee osteoarthritis, but their role in early cartilage degeneration after anterior cruciate ligament reconstruction (ACLR) is not well understood. Hypothesis/Purpose: The objective was to evaluate the association of frontal plane gait mechanics with medial knee cartilage magnetic resonance (MR) relaxation times over 1 year in patients with ACLR and controls. It was hypothesized that (1) there will be an increase in frontal plane medial knee loading and medial knee MR relaxation times over time in the patients with ACLR, and (2) increases in frontal plane medial knee loading will be associated with an increase in medial knee MR relaxation times...
November 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29096985/dual-task-and-anticipation-impact-lower-limb-biomechanics-during-a-single-leg-cut-with-body-borne-load
#8
Kayla D Seymore, Sarah E Cameron, Jonathan T Kaplan, John W Ramsay, Tyler N Brown
This study quantified how a dual cognitive task impacts lower limb biomechanics during anticipated and unanticipated single-leg cuts with body borne load. Twenty-four males performed anticipated and unanticipated cuts with and without a dual cognitive task with three load conditions: no load (∼6 kg), medium load (15% of BW), and heavy load (30% of BW). Lower limb biomechanics were submitted to a repeated measures linear mixed model to test the main and interaction effects of load, anticipation, and dual task...
October 25, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29091540/modulation-of-vertical-ground-reaction-impulse-with-real-time-biofeedback-a-feasibility-study
#9
Pawel R Golyski, Elizabeth M Bell, Elizabeth M Husson, Erik J Wolf, Brad D Hendershot
Given its apparent representation of cumulative (vs. peak) loads, this feasibility study investigates vertical ground reaction impulse (vGRI) as a real-time biofeedback variable for gait training aimed at reducing lower limb loading. Fifteen uninjured participants (mean age = 27 yrs) completed twelve 2-min trials, one at each combination of four walking speeds (1.0, 1.2, 1.4, and 1.6m/s) and three targeted reductions in vGRI (5, 10, and 15%) of the assigned ("target") limb, with the latter specified relative to an initial baseline (no feedback) condition at each speed...
November 1, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/29067818/kinetics-of-the-lower-limb-during-two-typical-tai-chi-movements-in-the-elderly
#10
Jing Xian Li, Nok-Yeung Law
Tai Chi (TC) is a recommended exercise for elderly people; however, its loading on the joints of the lower limbs is unknown. This study examined the 3D kinetics of the lower limbs during two typical TC movements and walking in the elderly. Fifteen experienced TC practitioners participated. Ground reaction forces, joint moments and time-to-peak joint moment generation were analysed. Compared with walking, both TC movements generated significantly (1) smaller peak ground reaction forces in all directions, except the anterior; (2) larger hip extension, adduction and internal rotational moments, knee adduction/abduction and internal rotation moments and eversion/inversion and external/internal moments of ankle-foot; and (3) longer peak moment generation time for hip extension, adduction and internal rotation, knee extension and ankle dorsiflexion and inversion...
October 25, 2017: Research in Sports Medicine
https://www.readbyqxmd.com/read/29028621/combining-valgus-knee-brace-and-lateral-foot-wedges-reduces-external-forces-and-moments-in-osteoarthritis-patients
#11
Amir Ali Jafarnezhadgero, Anderson S Oliveira, Seyed Hamed Mousavi, Morteza Madadi-Shad
Osteoarthritis progression can be related to the external knee adduction and flexion moments during walking. Lateral foot wedges and knee braces have been used as treatment for osteoarthritis, but little is known about their influence on knee joint moments generated in the sagittal and frontal planes. Therefore, the aim of the present study was determine the effects of the isolated and combined use of valgus knee brace and lateral wedge foot orthotic on peak forces and moments during gait in knee osteoarthritis patients...
October 5, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28985577/characteristics-of-clinical-measurements-between-biomechanical-responders-and-non-responders-to-a-shoe-designed-for-knee-osteoarthritis
#12
Yongwook Kim, Jim Richards, Roy H Lidtke, Renato Trede
PURPOSE: The purpose of this study was to investigate the characteristics of biomechanical and clinical measurements in relation to the knee adduction moment when wearing a standard shoe and a shoe design for individuals with knee osteoarthritis (Flex-OA). METHODS: Kinematic and kinetic data were collected from thirty-two healthy individuals (64 knees) using a ten camera motion analysis system and four force plates. Subjects performed 5 walking trials under the two conditions and the magnitude of individuals' biomechanical responses where explored in relation to the clinical assessment of the Foot Posture Index, hip rotation range, strength of hip rotators, and active ankle-foot motion, all of which have been described as possible compensation mechanisms in knee osteoarthritis...
September 29, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28985489/changes-in-gait-characteristics-of-women-with-early-and-established-medial-knee-osteoarthritis-results-from-a-2-years-longitudinal-study
#13
Armaghan Mahmoudian, Jaap H van Dieёn, Isabel A C Baert, Sjoerd M Bruijn, Gert S Faber, Frank P Luyten, Sabine M P Verschueren
BACKGROUND: Despite the large number of cross-sectional studies on gait in subjects with knee osteoarthritis, there are scarcely any longitudinal studies on gait changes in knee osteoarthritis. METHODS: Gait analysis was performed on 25 women with early and 18 with established medial knee osteoarthritis, as well as a group of 23 healthy controls. Subjects were asked to walk at their comfortable speed. Kinematic and kinetic data were measured at baseline and after 2years follow-up...
October 2, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28985125/progressive-changes-in-walking-kinematics-and-kinetics-after-anterior-cruciate-ligament-injury-and-reconstruction-a-review-and-meta-analysis
#14
Lindsay V Slater, Joseph M Hart, Adam R Kelly, Christopher M Kuenze
CONTEXT:   Anterior cruciate ligament (ACL) injury and ACL reconstruction (ACLR) result in persistent alterations in lower extremity movement patterns. The progression of lower extremity biomechanics from the time of injury has not been described. OBJECTIVE:   To compare the 3-dimensional (3D) lower extremity kinematics and kinetics of walking among individuals with ACL deficiency (ACLD), individuals with ACLR, and healthy control participants from 3 to 64 months after ACLR...
September 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/28984381/longitudinal-changes-in-knee-gait-mechanics-between-2-and-8-years-after-anterior-cruciate-ligament-reconstruction
#15
Jennifer C Erhart-Hledik, Constance R Chu, Jessica L Asay, Thomas P Andriacchi
The purpose of this study was to longitudinally investigate changes in knee joint kinematics and kinetics from 2 to 8 years post-ACLR. Seventeen subjects with primary unilateral transtibial ACLR performed bilateral gait analysis approximately 2 years and 8 years post-ACLR. Seventeen matched healthy control subjects were also analyzed. Kinematic and kinetic comparisons between the ACLR and contralateral limbs over time were completed using a 2 × 2 (time, limb) repeated-measures ANOVA. Unpaired Student's t-tests were used to compare the ACLR and contralateral kinematics and kinetics to the control group...
October 6, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28978462/sex-specific-kinetic-and-kinematic-indicators-of-medial-tibiofemoral-force-during-walking-and-running
#16
Jean-Francois Esculier, Richard W Willy, Michael W Baggaley, Stacey A Meardon, John D Willson
BACKGROUND: Our aims were to (1) Evaluate sex-specific contributions of peak knee flexion moment (pKFM) and peak knee adduction moment (pKAM) in medial tibiofemoral joint (TFJ) force during walking and running; (2) identify kinematic variables to estimate peak medial TFJ force. METHODS: Eighty-seven runners participated (36 females, 51 males; age=23.0±3.8years (1 standard deviation)). Kinematics and kinetics data were collected during treadmill walking (1.3m/s) and running (3...
October 1, 2017: Knee
https://www.readbyqxmd.com/read/28970124/effects-of-toe-in-and-toe-in-with-wider-step-width-on-level-walking-knee-biomechanics-in-varus-valgus-and-neutral-knee-alignments
#17
Hunter J Bennett, Guangping Shen, Harold E Cates, Songning Zhang
BACKGROUND: Increased peak external knee adduction moments exist for individuals with knee osteoarthritis and varus knee alignments, compared to healthy and neutrally aligned counterparts. Walking with increased toe-in or increased step width have been individually utilized to successfully reduce 1st and 2nd peak knee adduction moments, respectfully, but have not previously been combined or tested among all alignment groups. The purpose of this study was to compare toe-in only and toe-in with wider step width gait modifications in individuals with neutral, valgus, and varus alignments...
September 29, 2017: Knee
https://www.readbyqxmd.com/read/28968547/hip-movement-pathomechanics-of-patients-with-hip-osteoarthritis-aim-at-reducing-hip-joint-loading-on-the-osteoarthritic-side
#18
Christophe A G Meyer, Mariska Wesseling, Kristoff Corten, Angela Nieuwenhuys, Davide Monari, Jean-Pierre Simon, Ilse Jonkers, Kaat Desloovere
This study aims at defining gait pathomechanics in patients with hip osteoarthritis (OA) and their effect on hip joint loading by combining analyses of hip kinematics, kinetics and contact forces during gait. Twenty patients with hip OA and 17 healthy volunteers matched for age and BMI performed three-dimensional gait analysis. Hip OA level was evaluated based on plane radiographs using the Tönnis classification. Hip joint kinematics, kinetics as well as hip contact forces were calculated. Waveforms were time normalized and compared between groups using statistical parametric mapping analysis...
September 22, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28952871/female-athletes-with-varying-levels-of-vertical-stiffness-display-kinematic-and-kinetic-differences-during-single-leg-hopping
#19
Justin P Waxman, Kevin R Ford, Anh-Dung Nguyen, Jeffrey B Taylor
Vertical stiffness may contribute to lower-extremity injury risk; however, it is unknown whether athletes with different stiffness levels display differences in biomechanics. This study compared differences in biomechanics between female athletes (n=99) with varying stiffness levels during a repetitive, single-leg, vertical hopping task. Vertical stiffness was calculated as the ratio of peak vertical ground-reaction force to maximum center-of-mass displacement. Tertiles were established using stiffness values, and separate one-way ANOVAs were used to evaluate between-group differences...
September 27, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28893285/estimates-of-individual-muscle-power-production-in-normal-adult-walking
#20
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
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