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https://www.readbyqxmd.com/read/28226296/the-relationship-between-external-knee-moments-and-muscle-co-activation-in-subjects-with-medial-knee-osteoarthritis
#1
Luiz Fernando Approbato Selistre, Stela Márcia Mattiello, Theresa Helissa Nakagawa, Glaucia Helena Gonçalves, Marina Petrella, Richard Keith Jones
PURPOSE: External knee moments are reliable to measure knee load but it does not take into account muscle activity. Considering that muscle co-activation increases compressive forces at the knee joint, identifying relationships between muscle co-activations and knee joint load would complement the investigation of the knee loading in subjects with knee osteoarthritis. The purpose of this study was to identify relationships between muscle co-activation and external knee moments during walking in subjects with medial knee osteoarthritis...
January 18, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28222331/the-moro-reaction-more-than-a-reflex-a-ritualized-behavior-of-nonverbal-communication
#2
Pierre V Rousseau, Florence Matton, Renaud Lecuyer, Willy Lahaye
OBJECTIVE: To propose a phylogenetic significance to the Moro reflex which remains unexplained since its publication in 1918 because both hands are free at the end of the gesture. METHOD: Among the 75 videos of healthy term newborns we have filmed in a research project on antenatal education to parenthood, we describe a sequence that clearly showed the successive movements of the Moro reflex and we report the occurrence of this reflex in the videos that were recorded from Time 0 of birth defined as the moment that lies between the birth of the thorax and the pelvis of the infant...
February 18, 2017: Infant Behavior & Development
https://www.readbyqxmd.com/read/28222057/effects-of-toe-in-and-wider-step-width-in-stair-ascent-with-different-knee-alignments
#3
Hunter J Bennett, Songning Zhang, Guangping Shen, Joshua T Weinhandl, Max R Paquette, Jeffrey Reinbolt, Dawn P Coe
PURPOSE: Toe-in (TI) and toe-in with wider step width (TIW) gait modifications have successfully reduced the internal peak knee adduction moment (KAM) during level walking and stair ascent tasks, respectively, for healthy and knee osteoarthritis populations. However, the concurrent effects of these modifications have not previously been combined to reduce both the first and the second peak KAM during stair ascent or tested among the different knee alignment groups. Therefore, the purpose of this study was to examine effects of TI and TIW gait modifications on knee biomechanics during stair ascent in individuals with varus, neutral, and valgus knee alignments...
March 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28189095/effects-of-toe-out-and-toe-in-gait-with-varying-walking-speeds-on-knee-joint-mechanics-and-lower-limb-energetics
#4
Soobia Saad Khan, Saad Jawaid Khan, Juliana Usman
Toe-out/-in gait has been prescribed in reducing knee joint load to medial knee osteoarthritis patients. This study focused on the effects of toe-out/-in at different walking speeds on first peak knee adduction moment (fKAM), second peak KAM (sKAM), knee adduction angular impulse (KAAI), net mechanical work by lower limb as well as joint-level contribution to the total limb work during level walking. Gait analysis of 20 healthy young adults was done walking at pre-defined normal (1.18m/s), slow (0.85m/s) and fast (1...
January 27, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28174605/plug-in-gait-calculation-of-the-knee-adduction-moment-in-people-with-knee-osteoarthritis-during-shod-walking-comparison-of-two-different-foot-marker-models
#5
Kade L Paterson, Rana S Hinman, Ben R Metcalf, Kim L Bennell, Tim V Wrigley
BACKGROUND: Understanding how kinematic multi-segment foot modelling influences the utility of Plug-in-Gait calculations of the knee adduction moment (KAM) during shod walking is relevant to knee osteoarthritis (OA). Multi-segment foot markers placed on the skin through windows cut in to the shoe provide a more accurate representation of foot mechanics than the traditional marker set used by Plug-in-Gait, which uses fewer markers, placed on the shoe itself. We aimed to investigate whether Plug-in-Gait calculation of the KAM differed when using a kinematic multi-segment foot model compared to the traditional Plug-in-Gait marker set...
2017: Journal of Foot and Ankle Research
https://www.readbyqxmd.com/read/28173989/analysis-of-the-factors-that-correlate-with-increased-knee-adduction-moment-during-gait-in-the-early-postoperative-period-following-total-knee-arthroplasty
#6
Takeo Nagura, Yasuo Niki, Kengo Harato, Takeshi Mochizuki, Yoshimori Kiriyama
BACKGROUND: Analysis of dynamic knee loading during gait is essential to prevent mechanical failures following total knee arthroplasty. External knee adduction moment during gait is the primary factor producing medial joint reaction force, and an increase in the moment is directly related to an increase in the medial compartment load on the knee. METHODS: Knee adduction moment during gait in 39 knees of 32 female patients following a posterior stabilized knee replacement with a single surgeon was evaluated at 1...
February 4, 2017: Knee
https://www.readbyqxmd.com/read/28173988/gender-differences-in-the-restoration-of-knee-joint-biomechanics-during-gait-after-anterior-cruciate-ligament-reconstruction
#7
Makoto Asaeda, Masataka Deie, Naoto Fujita, Yoshifumi Kono, Chiaki Terai, Wataru Kuwahara, Hodaka Watanabe, Hiroaki Kimura, Nobuo Adachi, Toru Sunagawa, Mitsuo Ochi
BACKGROUND: The aim of our study was to evaluate the effects of gender on recovery of knee joint biomechanics over the stance phase of gait after reconstruction of the anterior cruciate ligament (ACL). METHODS: Gait parameters and knee joint kinematics and kinetics were compared in 32 patients (16 male and 16 female) who underwent ACL reconstruction for a unilateral ACL deficiency, with comparison to an age-, height-, and weight-matched Control group. Knee flexion, adduction and tibial rotation angles were measured and knee extension and abduction moment was calculated by inverse dynamics methods...
February 4, 2017: Knee
https://www.readbyqxmd.com/read/28169098/knee-joint-moments-during-high-flexion-movements-timing-of-peak-moments-and-the-effect-of-safety-footwear
#8
Helen C Chong, Liana M Tennant, David C Kingston, Stacey M Acker
AIM: (1) Characterize knee joint moments and peak knee flexion moment timing during kneeling transitions, with the intent of identifying high-risk postures. (2) Determine whether safety footwear worn by kneeling workers (construction workers, tile setters, masons, roofers) alters high flexion kneeling mechanics. METHODS: Fifteen males performed high flexion kneeling transitions. Kinetics and kinematics were analyzed for differences in ascent and descent in the lead and trail legs...
February 4, 2017: Knee
https://www.readbyqxmd.com/read/28161687/less-hip-joint-loading-only-during-running-rather-than-walking-in-elderly-compared-to-young-adults
#9
Georgios Giarmatzis, Ilse Jonkers, Remco Baggen, Sabine Verschueren
Walking and running have been found to increase hip bone mass in postmenopausal women. However, the optimal speed to trigger osteogenesis is still under debate because the exact loading during different speeds is poorly characterized. Moreover, age related differences in gait kinematics/kinetics can potentially result in differences in peak hip loading, making extrapolation of results based on young populations to the elderly misleading. Using integrated 3D motion capture and musculoskeletal modeling, peak hip contact forces (HCFs) were calculated during walking and running from 3 to 9km/h in 14 female young (21...
January 24, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28150869/biochemical-markers-of-cartilage-metabolism-are-associated-with-walking-biomechanics-six-months-following-anterior-cruciate-ligament-reconstruction
#10
Brian Pietrosimone, Richard F Loeser, J Troy Blackburn, Darin A Padua, Matthew S Harkey, Laura E Stanley, Brittney A Luc-Harkey, Veronica Ulici, Stephen W Marshall, Joanne M Jordan, Jeffery T Spang
The purpose of our study was to determine the association between biomechanical outcomes of walking gait (peak vertical ground reaction force [vGRF], vGRF loading rate [vGRF-LR] and knee adduction moment [KAM]) six months following anterior cruciate ligament reconstruction (ACLR) and biochemical markers of serum type-II collagen turnover (collagen type-II cleavage product to collagen type-II C-propeptide [C2C:CPII]), plasma degenerative enzymes (matrix metalloproteinase-3 [MMP-3]), and a pro-inflammatory cytokine (interleukin-6 [IL-6])...
February 2, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28128475/cyclops-lesions-are-associated-with-altered-gait-patterns-and-medial-knee-joint-cartilage-degeneration-at-one-year-after-acl-reconstruction
#11
Michael A Samaan, Luca Facchetti, Valentina Pedoia, Matthew S Tanaka, Thomas M Link, Richard B Souza, C Benjamin Ma, Xiaojuan Li
In this exploratory study, gait analysis and quantitative MRI (QMRI) were used to assess biomechanical differences in patients that present with cyclops lesions at 12 months after ACL-reconstruction (ACLR). Thirty ACLR patients without and 10 ACLR patients with cyclops lesions underwent 3T MR T1ρ mapping of the reconstructed knee joint prior to ACLR and at 12 months after ACLR, as well as a gait assessment during a fixed walking speed at 12 months after ACLR. Both external sagittal and frontal plane knee joint moments and joint moment impulses were calculated and assessed throughout the stance phase of gait...
January 27, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28126693/differences-in-knee-adduction-moment-between-healthy-subjects-and-patients-with-osteoarthritis-depend-on-the-knee-axis-definition
#12
S Meireles, F De Groote, S Van Rossom, S Verschueren, I Jonkers
OBJECTIVE: This study, firstly, investigates the effect of using an anatomical versus a functional axis of rotation (FAR) on knee adduction moment (KAM) in healthy subjects and patients with knee osteoarthritis (KOA). Secondly, this study reports KAM for models with FAR calculated using weight-bearing and non-weight-bearing motion. DESIGN: Three musculoskeletal models were created using OpenSim with different knee axis of rotation (AR): transepicondylar axis (TEA); FAR calculated based on SARA algorithm using a weight-bearing motion (wFAR) and a non-weight-bearing motion (nwFAR)...
January 19, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28120496/effects-of-active-feedback-gait-retraining-to-produce-a-medial-weight-transfer-at-the-foot-in-subjects-with-symptomatic-medial-knee-osteoarthritis
#13
Jennifer C Erhart-Hledik, Jessica L Asay, Caitlin Clancy, Constance R Chu, Thomas P Andriacchi
This study aimed to determine if active feedback gait retraining to produce a medial weight transfer at the foot significantly reduces the knee adduction moment in subjects with medial compartment knee osteoarthritis. Secondarily, changes in peak knee flexion moment, frontal plane knee and ankle kinematics, and center of pressure were investigated. Ten individuals with medial compartment knee osteoarthritis (9 males; age: 65.3 ± 9.8 years; BMI: 27.8 ± 3.0 kg/m(2) ) were tested at self-selected normal and fast speeds in two conditions: Intervention, with an active feedback device attached to the shoe of their more affected leg, and control, with the device de-activated...
January 24, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28118311/acute-effects-of-static-stretching-of-hamstring-on-performance-and-acl-injury-risk-during-stop-jump-and-cutting-tasks-in-female-athletes
#14
Mianfang Ruan, Qiang Zhang, Xie Wu
There is limited research investigating antagonist stretch. The purpose of this study was to evaluate the influence of SSH on performance and ACL injury risk during stop-jump and 180° cutting tasks. Twelve female college athletes (age 20.8 ± 0.7 years; height 1.61 ± 0.05 m; mass 54.25 ± 4.22 kg) participated in this study. Subjects performed stop-jump and 180° cutting tasks under two conditions: after warm-up with 4×30 s SSH or after warm-up without SSH. Three-dimensional kinematic and kinetic data as well as EMG of biceps femoris (BF), rectus femoris (RF), vastus medialis (VM), and gastrocnemius medialis (GM) were collected during testing...
January 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28113632/gait-analysis-of-transfemoral-amputees-errors-in-inverse-dynamics-are-substantial-and-depend-on-prosthetic-design
#15
Raphael Dumas, Rickard Branemark, Laurent Frossard
Quantitative assessments of prostheses performances rely more and more frequently on gait analysis focusing on prosthetic knee joint forces and moments computed by inverse dynamics. However, this method is prone to errors, as demonstrated in comparison with direct measurements of these forces and moments. The magnitude of errors reported in the literature seems to vary depending on prosthetic components. Therefore, the purposes of this study were (A) to quantify and compare the magnitude of errors in knee joint forces and moments obtained with inverse dynamics and direct measurements on ten participants with transfemoral amputation during walking and (B) to investigate if these errors can be characterised for different prosthetic knees...
August 18, 2016: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28072630/bracing-of-the-reconstructed-and-osteoarthritic-knee-during-high-dynamic-load-tasks
#16
Harvi F Hart, Kay M Crossley, Natalie J Collins, David C Ackland
PURPOSE: Lateral compartment osteoarthritis accompanied by abnormal knee biomechanics are frequently reported in individuals with knee osteoarthritis after anterior cruciate ligament reconstruction (ACLR). The aim of this study was to evaluate changes in knee biomechanics produced by an adjusted and unadjusted varus knee brace during high dynamic loading activities in individuals with lateral knee osteoarthritis after ACLR and valgus malalignment. METHODS: Nineteen participants who had undergone ACLR 5 to 20 years previously and had symptomatic and radiographic lateral knee osteoarthritis with valgus malalignment were assessed...
January 9, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28064033/altered-gait-mechanics-and-elevated-serum-pro-inflammatory-cytokines-in-asymptomatic-patients-with-mri-evidence-of-knee-cartilage-loss
#17
S N Edd, J Favre, K Blazek, P Omoumi, J L Asay, T P Andriacchi
OBJECTIVE: To test if sagittal plane gait mechanics parameters and serum inflammation levels differ between healthy asymptomatic subjects and asymptomatic subjects with magnetic resonance imaging (MRI) evidence of cartilage loss. DESIGN: Gait mechanics and resting serum tumor necrosis factor-α (TNFα) concentrations were measured for two groups of asymptomatic subjects recruited for a previous study: Pre-Osteoarthritis (OA) subjects had MRI evidence of partial- or full-thickness knee cartilage loss in at least one compartment (n = 52 (30 female), 1...
January 5, 2017: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/28002437/non-sagittal-knee-joint-kinematics-and-kinetics-during-gait-on-level-and-sloped-grounds-with-unicompartmental-and-total-knee-arthroplasty-patients
#18
Igor Komnik, Markus Peters, Johannes Funken, Sina David, Stefan Weiss, Wolfgang Potthast
After knee arthroplasty (KA) surgery, patients experience abnormal kinematics and kinetics during numerous activities of daily living. Biomechanical investigations have focused primarily on level walking, whereas walking on sloped surfaces, which is stated to affect knee kinematics and kinetics considerably, has been neglected to this day. This study aimed to analyze over-ground walking on level and sloped surfaces with a special focus on transverse and frontal plane knee kinematics and kinetics in patients with KA...
2016: PloS One
https://www.readbyqxmd.com/read/27987386/corrigendum-to-ankle-motion-influences-the-external-knee-adduction-moment-and-may-predict-who-will-respond-to-lateral-wedge-insoles-an-ancillary-analysis-from-the-silk-trial-osteoarthr-cartil-23-2015-1316-1322
#19
G J Chapman, M J Parkes, L Forsythe, D T Felson, R K Jones
No abstract text is available yet for this article.
December 14, 2016: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/27984498/the-biomechanical-demands-on-the-hip-during-progressive-stepping-tasks
#20
Gillian L Hatfield, Jesse M Charlton, Christopher K Cochrane, Connor Hammond, Chris Napier, Judit Takacs, Natasha M Krowchuk, Michael A Hunt
Functional hip strengthening exercises are important components of lower extremity rehabilitation, and include single leg squats, step-downs, and step-ups. The biomechanical demand of these tasks is unclear. This repeated-measures study determined hip biomechanical demands in a healthy population. Twenty individuals (10 male, 26.6 +/- 5.1 years, 22.1 +/- 2.3 kg/m) participated. Three-dimensional motion, ground reaction force data, and surface electromyograms were recorded during four randomly-ordered tasks...
November 29, 2016: Journal of Strength and Conditioning Research
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