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https://www.readbyqxmd.com/read/28820647/acute-fatigue-negatively-affects-risk-factors-for-injury-in-trained-but-not-well-trained-habitually-shod-runners-when-running-barefoot
#1
Nicholas Tam, Devon R Coetzee, Safwaan Ahmed, Robert P Lamberts, Yumna Albertus-Kajee, Ross Tucker
INTRODUCTION: Many factors may contribute to running-related injury. These include fatigue and footwear, the combination of which has rarely been studied, in particular with reference to barefoot running, recently advocated as a method to reduce injury risk. METHODS: Twenty-two runners (12 well-trained and 10 trained) participated in a 10 km fatiguing trial. Knee and ankle joint kinematics and kinetics and electromyography were assessed during overground running in the barefoot and shod condition...
August 18, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28820012/effect-of-rotational-prosthetic-alignment-variation-on-tibiofemoral-contact-pressure-distribution-and-joint-kinematics-in-total-knee-replacement
#2
Xin Xie, Roy Rusly, John D DesJardins, Frank Voss, Kim Chillag, Martine LaBerge
In total knee replacement surgery, implant alignment is one of the most important criteria for successful long-term clinical outcome. During total knee replacement implantation, femoral and tibial alignment are determined through appropriate bone resections, which could vary based on patient anatomy, implant design and surgical technique and further influence loading conditions and clinical outcomes. The current research focused on three critical alignment parameters for total knee replacement insertion: femoral component internal/external (I/E) rotation, varus-valgus tibiofemoral angulation and posterior tibial slope...
August 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28818697/kinematic-differences-during-a-jump-cut-maneuver-between-individuals-with-and-without-a-concussion-history
#3
Andrew Lapointe, Luis Nolasco, Aniela Sosnowski, Eva Andrews, Douglas N Martini, Riann M Palmieri-Smith, Deanna H Gates, Steven P Broglio
Recent evidence suggests that athletes are at a higher risk of lower-body injuries in the months and years following a concussion. However, little is known about how people modify their movements post-concussion. This study examined kinematics during a jump cut motion in young adults with a concussion history (n=9; 4 males, 5 females; 3.1years' post-injury) and 10 controls (6 males, 4 females). Peak center of mass and peak knee angles during the landing phase of a jump-cut maneuver were evaluated. Participants with a concussion history demonstrated decreased knee varus (left: Mconc=-0...
August 14, 2017: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/28813993/the-influence-of-a-user-adaptive-prosthetic-knee-on-planned-gait-termination
#4
Erik C Prinsen, Marc J Nederhand, Bart F Koopman, Johan S Rietman
The added value of user-adaptive prosthetic knees has been predominantly evaluated in level walking or ramp/stair negotiation. Previous studies indicate that the activity pattern of individuals with an amputation mainly consists of short periods of continuous walking, indicating that a high percentage of ambulatory activity involves gait termination. The potential added value of user-adaptive prosthetic knees in gait termination has not been studied yet. Ten individuals with an amputation were measured with their own non-microprocessor controlled prosthetic knee and with the Rheo Knee II (a user-adaptive prosthetic knee)...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813947/exploiting-kinematic-constraints-to-compensate-magnetic-disturbances-when-calculating-joint-angles-of-approximate-hinge-joints-from-orientation-estimates-of-inertial-sensors
#5
Daniel Laidig, Thomas Schauer, Thomas Seel
Inertial Measurement Units (IMUs) have become a widely used tool for rehabilitation and other application domains in which human motion is analyzed using an ambulatory or wearable setup. Since the magnetic field is inhomogeneous in indoor environments and in the proximity of ferromagnetic material, standard orientation estimation and joint angle calculation algorithms often lead to inaccurate or even completely wrong results. One approach to circumvent this is to exploit the kinematic constraint that is induced by mechanical hinge joints and also by approximate hinge joints such as the knee joint and the finger (interphalangeal) joints of the human body...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813868/relationship-between-assistive-torque-and-knee-biomechanics-during-exoskeleton-walking-in-individuals-with-crouch-gait
#6
Zachary F Lerner, Diane L Damiano, Thomas C Bulea
Crouch or "flexed knee" gait is a pathological gait pattern affecting many individuals with cerebral palsy. One proposed method to alleviate crouch is to provide robotic assistance to knee extension during walking. The purpose of this study was to evaluate how the magnitude of knee extensor torque affects knee kinematics, kinetics, and muscle activity. Motion capture, ground reaction force and electromyography data were collected while four participants with crouch gait from cerebral palsy walked with assistance from a novel robotic exoskeleton on an instrumented treadmill...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813865/template-model-inspired-leg-force-feedback-based-control-can-assist-human-walking
#7
Guoping Zhao, Maziar Sharbafi, Mark Vlutters, Edwin van Asseldonk, Andre Seyfarth
We present a novel control approach for assistive lower-extremity exoskeletons. In particular, we implement a virtual pivot point (VPP) template model inspired leg force feedback based controller on a lower-extremity powered exoskeleton (LOPES II) and demonstrate that it can effectively assist humans during walking. It has been shown that the VPP template model is capable of stabilizing the trunk and reproduce a human-like hip torque during the stance phase of walking. With leg force and joint angle feedback inspired by the VPP template model, our controller provides hip and knee torque assistance during the stance phase...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813858/active-impedance-control-of-a-knee-joint-orthosis-during-swing-phase
#8
Fatima El Zahraa Wehbi, Weiguang Huo, Yacine Amirat, Maher El Rafei, Mohamad Khalil, Samer Mohammed
In this paper, an active impedance control strategy for a knee-joint orthosis is proposed to assist individuals suffering from lower-limb muscular weaknesses during the swing phase of walking activities. The goal of the proposed strategy is to decrease the human effort required for ensuring a successful knee joint movement during walking without sacrificing the wearer's control priority. In this study, a gait-phase based desired knee-joint admittance model is designed by analyzing the kinematic and kinetic characteristics of the wearer's shank-foot segment during walking...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813857/kinematic-effects-of-inertia-and-friction-added-by-a-robotic-knee-exoskeleton-after-prolonged-walking
#9
C Shirota, M R Tucker, O Lambercy, R Gassert
The capabilities of robotic gait assistive devices are ever increasing; however, their adoption outside of the lab is still limited. A critical barrier for the functionality of these devices are the still unknown mechanical properties of the human leg during dynamic conditions such as walking. We built a robotic knee exoskeleton to address this problem. Here, we present the effects of our device on the walking pattern of four subjects. We assessed the effects after a short period of acclimation as well as after a 1...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813853/towards-human-knee-orthosis-interaction-based-on-adaptive-impedance-control-through-stiffness-adjustment
#10
Joana Figueiredo, Paulo Felix, Cristina P Santos, Juan C Moreno
Rehabilitation interventions involving powered, wearable lower limb orthoses that can provide high-challenging locomotor tasks for repetitive training sessions, mainly when assist-as-needed strategies, such as adaptive impedance control, are designed. In this study, the adaptive behavior was ensured by software control of the robotic stiffness involved in the human-knee orthosis interaction in function of the gait cycle and speed. To estimate the stiffness, we analyzed the interaction torque-angle characteristics with experimental data...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813848/preliminary-assessment-of-a-lower-limb-exoskeleton-controller-for-guiding-leg-movement-in-overground-walking
#11
Andres Martinez, Brian Lawson, Michael Goldfarb
This paper describes the design, implementation, and preliminary validation of a controller for a powered lower-limb exoskeleton that reshapes a user's leg movement during over-ground walking. The intended application of the controller is to facilitate gait training for individuals suffering from post-stroke hemiparesis. The controller mimics a kinematic constraint between the knee and hip joints during the swing phase of gait, such that movement is not dependent on time (i.e., step time is determined entirely by the user)...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813836/development-of-new-rehabilitation-robot-device-that-can-be-attached-to-the-conventional-knee-ankle-foot-orthosis-for-controlling-the-knee-in-individuals-after-stroke
#12
Kawasaki Shihomi, Ohata Koji, Tsuboyama Tadao, Sawada Yuichi, Higashi Yoshiyuki
This research developed a device that can be attached to the conventional Knee-Ankle-Foot-Orthosis for controlling the knee in individuals after stroke. The device automatically assists the flexion and extension movements of the knee joint at the appropriate timing. We aimed to clarify the effect of this device on gait performance, kinematic pattern and muscle activation during gait. Seventeen participants after stroke were recruited in this study. They walked with this device for 3 minutes, and we measured the 10m gait time, number of steps, knee motion using electric goniometer and muscle activities of lower limbs during gait...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813827/biomechanical-effects-of-robot-assisted-walking-on-knee-joint-kinematics-and-muscle-activation-pattern
#13
Pavithra Thangavel, S Vidhya, Junhua Li, Effie Chew, Anastasios Bezerianos, Haoyong Yu
Since manual rehabilitation therapy can be taxing for both the patient and the physiotherapist, a gait rehabilitation robot has been built to reduce the physical strain and increase the efficacy of the rehabilitation therapy. The prototype of the gait rehabilitation robot is designed to provide assistance while walking for patients with abnormal gait pattern and it can also be used for rehabilitation therapy to restore an individual's normal gait pattern by aiding motor recovery. The Gait Rehabilitation Robot uses gait event based synchronization, which enables the exoskeleton to provide synchronous assistance during walking that aims to reduce the lower-limb muscle activation...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28808736/the-role-of-isolated-posterior-cruciate-ligament-reconstruction-in-knees-with-combined-posterior-cruciate-ligament-and-posterolateral-complex-injury
#14
REVIEW
Dong-Yeong Lee, Young-Jin Park, Dong-Hee Kim, Hyun-Jung Kim, Dae-Cheol Nam, Jin-Sung Park, Sun-Chul Hwang
PURPOSE: This is a meta-analysis comparing biomechanical outcomes to determine whether an isolated posterior cruciate ligament (PCL) reconstruction can restore normal knee kinematics in a combined PCL/posterolateral complex (PLC) injury and whether double-bundle (DB) PCL reconstruction is superior in controlling posterior and rotational laxity compared with single-bundle (SB) PCL reconstruction in a PCL/PLC-deficient knee. METHODS: A number of electronic databases were searched for relevant articles published through August 2016 that compared biomechanical outcomes of PCL reconstruction in patients who underwent reconstruction for combined PCL/PLC deficiencies...
August 14, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28806980/factors-influencing-outcomes-after-medial-hamstring-lengthening-with-semitendinosus-transfer-in-patients-with-cerebral-palsy
#15
Ki Hyuk Sung, Jaebong Lee, Chin Youb Chung, Kyoung Min Lee, Byung Chae Cho, Seung Jun Moon, Jaeyoung Kim, Moon Seok Park
BACKGROUND: Although several studies have investigated the outcomes after distal hamstring lengthening (DHL), no study has undertaken an approach that included all or most of the important factors that could influence the results. This study was performed to evaluate the outcomes after DHL and analyze the factors that influence the improvement and serial change in knee motion after surgery in patients with cerebral palsy (CP), using a linear mixed model (LMM). METHODS: The study included 314 ambulatory CP patients (594 limbs) with spsastic diplegia who were followed up after undergoing DHL as part of a single-event multilevel surgery and who underwent preoperative and postoperative 3-dimensional (3D) gait analyses...
August 14, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28806709/in-vivo-kinematics-of-early-stage-osteoarthritic-knees-during-pivot-and-squat-activities
#16
Keisuke Matsuki, Kei O Matsuki, Tomonori Kenmoku, Satoshi Yamaguchi, Takahisa Sasho, Scott A Banks
Kinematic changes have been shown to accompany severe knee osteoarthritis, but no studies have analyzed early-stage osteoarthritic knee kinematics in the transverse plane during functional activities. The purpose of this study was to analyze kinematics of early-stage osteoarthritic knees using model registration techniques. Fifteen early-stage osteoarthritic knees from eight females with a mean age of 52 years old (range, 43-57years old) were involved in this study. A radiologist confirmed with plain radiographs that knees had Kellgren-Lawrence grade-1 or -2 arthritic changes...
August 4, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28802221/in-vivo-mechanical-behaviour-of-the-anterior-cruciate-ligament-a-study-of-six-daily-and-high-impact-activities
#17
Elisa Roldán, Neil D Reeves, Glen Cooper, Kirstie Andrews
The anterior cruciate ligament (ACL) plays a key role in the stability of the knee joint restricting the rotation and anterior tibial translation. However, there is a lack of knowledge of the in vivo ACL mechanical behaviour during high impact manoeuvres. The motion of 12 young participants with healthy knees was captured while they performed the following activities: walking, running, cross-over cutting, sidestep cutting, jumping and jumping with one leg. The in vivo ACL length and strain were estimated using experimental kinematic data and three degree of freedom (DOF) knee model...
August 1, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28800252/progressive-changes-in-walking-kinematics-and-kinetics-after-anterior-cruciate-ligament-injury-and-reconstruction-a-review-and-meta-analysis
#18
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...
August 11, 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/28799030/transfer-of-improved-movement-technique-after-receiving-verbal-external-focus-and-video-instruction
#19
Anne Benjaminse, Wouter Welling, Bert Otten, Alli Gokeler
PURPOSE: It is unknown how movement patterns that are learned carry over to the field. The objective was to determine whether training during a jump-landing task would transfer to lower extremity kinematics and kinetics during sidestep cutting. METHODS: Forty healthy athletes were assigned to the verbal internal focus (IF, n = 10), verbal external focus (EF, n = 10), video (VI, n = 10) or control (CTRL, n = 10) group. A jump-landing task was performed as baseline followed by training blocks (TR1 and TR2) and a post-test...
August 10, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28797961/influence-of-different-degrees-of-bilateral-emulated-contractures-at-the-triceps-surae-on-gait-kinematics-the-difference-between-gastrocnemius-and-soleus
#20
M Attias, A Bonnefoy-Mazure, G De Coulon, L Cheze, S Armand
INTRODUCTION: Ankle plantarflexion contracture results from a permanent shortening of the muscle-tendon complex. It often leads to gait alterations. The objective of this study was to compare the kinematic adaptations of different degrees of contractures and between isolated bilateral gastrocnemius and soleus emulated contractures using an exoskeleton. METHODS: Eight combinations of contractures were emulated bilaterally on 10 asymptomatic participants using an exoskeleton that was able to emulate different degrees of contracture of gastrocnemius (biarticular muscle) and soleus (monoarticular muscle), corresponding at 0°, 10°, 20°, and 30° ankle plantarflexion contracture (knee-flexed and knee-extended)...
July 31, 2017: Gait & Posture
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