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ankle biomechanics

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https://www.readbyqxmd.com/read/28533609/gait-abnormalities-in-patients-with-chronic-ankle-instability-can-improve-following-a-non-invasive-biomechanical-therapy-a-retrospective-analysis
#1
Shay Tenenbaum, Ofir Chechik, Jason Bariteau, Nathan Bruck, Yiftah Beer, Mazen Falah, Ganit Segal, Amit Mor, Avi Elbaz
[Purpose] The purpose of this study was to evaluate the changes in gait patterns and clinical outcomes of patients with chronic ankle instability (CAI) following treatment with a home-based non-invasive biomechanical device. [Subjects and Methods] Thirty-three patients with CAI were compared with 43 healthy controls. Patients underwent a spatiotemporal gait assessment before and three months following treatment. Clinical evaluation was recorded with SF-36 Health Survey and the Foot and Ankle Outcome Score (FAOS)...
April 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28505593/foot-ankle-complex-injury-risk-curves-using-calcaneus-bone-mineral-density-data
#2
Narayan Yoganandan, Sajal Chirvi, Liming Voo, Nicholas DeVogel, Frank A Pintar, Anjishnu Banerjee
OBJECTIVE: Biomechanical data from post mortem human subject (PMHS) experiments are used to derive human injury probability curves and develop injury criteria. This process has been used in previous and current automotive crashworthiness studies, Federal safety standards, and dummy design and development. Human bone strength decreases as the individuals reach their elderly age. Injury risk curves using the primary predictor variable (e.g., force) should therefore account for such strength reduction when the test data are collected from PMHS specimens of different ages (age at the time of death)...
May 5, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28503144/rigid-ankle-foot-orthosis-deteriorates-mediolateral-balance-control-and-vertical-braking-during-gait-initiation
#3
Arnaud Delafontaine, Olivier Gagey, Silvia Colnaghi, Manh-Cuong Do, Jean-Louis Honeine
Rigid ankle-foot orthoses (AFO) are commonly used for impeding foot drop during the swing phase of gait. They also reduce pain and improve gait kinematics in patients with weakness or loss of integrity of ankle-foot complex structures due to various pathological conditions. However, this comes at the price of constraining ankle joint mobility, which might affect propulsive force generation and balance control. The present study examined the effects of wearing an AFO on biomechanical variables and electromyographic activity of tibialis anterior (TA) and soleus muscles during gait initiation (GI)...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28502348/osteolysis-in-total-ankle-replacement-how-does-it-work
#4
REVIEW
Norman Espinosa, Georg Klammer, Stephan H Wirth
Aseptic loosening of implants remains the most common reason for revision surgery for hip, knee, or ankle prostheses. Although a great scientific effort has been made to explain the underlying mechanisms it remains poorly understood, complex, and multifactorial. Many factors, including age, body weight, activity lesions, implant design, fixation methods, material proprieties, immunologic responses, and biomechanical adaptations to total ankle replacement all contribute to the development of periprosthetic osteolysis...
June 2017: Foot and Ankle Clinics
https://www.readbyqxmd.com/read/28500910/ankle-strength-impairments-associated-with-knee-osteoarthritis
#5
Glaucia Helena Gonçalves, Francisco Alburquerque Sendín, Paula Regina Mendes da Silva Serrão, Luiz Fernando Approbato Selistre, Marina Petrella, Cristiano Carvalho, Stela Márcia Mattiello
BACKGROUND: Knee Osteoarthritis seems to negatively impact ankle biomechanics. However, the effect of knee osteoarthritis on ankle muscle strength has not been clearly established. This study aimed to evaluate the ankle strength of the plantar flexors and dorsiflexors of patients with knee osteoarthritis in different degrees of severity. METHODS: Thirty-seven patients with knee osteoarthritis and 15 controls, subjected to clinical and radiographic analysis, were divided into three groups: control, mild, and moderate knee osteoarthritis...
May 4, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28499159/sensitivity-of-biomechanical-outcomes-to-independent-variations-of-hindfoot-and-forefoot-stiffness-in-foot-prostheses
#6
Peter Gabriel Adamczyk, Michelle Roland, Michael E Hahn
Many studies have reported the effects of different foot prostheses on gait, but most results cannot be generalized because the prostheses' properties are seldom reported. We varied hindfoot and forefoot stiffness in an experimental foot prosthesis, in increments of 15N/mm, and tested the parametric effects of these variations on treadmill walking in unilateral transtibial amputees, at speeds from 0.7 to 1.5m/s. We computed outcomes such as prosthesis energy return, center of mass (COM) mechanics, ground reaction forces, and joint mechanics, and computed their sensitivity to component stiffness...
May 9, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28487646/human-inspired-eigenmovement-concept-provides-coupling-free-sensorimotor-control-in-humanoid-robot
#7
Alexei V Alexandrov, Vittorio Lippi, Thomas Mergner, Alexander A Frolov, Georg Hettich, Dusan Husek
Control of a multi-body system in both robots and humans may face the problem of destabilizing dynamic coupling effects arising between linked body segments. The state of the art solutions in robotics are full state feedback controllers. For human hip-ankle coordination, a more parsimonious and theoretically stable alternative to the robotics solution has been suggested in terms of the Eigenmovement (EM) control. Eigenmovements are kinematic synergies designed to describe the multi DoF system, and its control, with a set of independent, and hence coupling-free, scalar equations...
2017: Frontiers in Neurorobotics
https://www.readbyqxmd.com/read/28487630/analysis-of-interrelationships-among-voluntary-and-prosthetic-leg-joint-parameters-using-cyclograms
#8
Farahiyah Jasni, Nur Azah Hamzaid, Nor Elleeiana Mohd Syah, Tze Y Chung, Noor Azuan Abu Osman
The walking mechanism of a prosthetic leg user is a tightly coordinated movement of several joints and limb segments. The interaction among the voluntary and mechanical joints and segments requires particular biomechanical insight. This study aims to analyze the inter-relationship between amputees' voluntary and mechanical coupled leg joints variables using cyclograms. From this analysis, the critical gait parameters in each gait phase were determined and analyzed if they contribute to a better powered prosthetic knee control design...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28476390/achilles-tendon-open-surgical-treatment-with-platelet-rich-fibrin-matrix-augmentation-biomechanical-evaluation
#9
Federica Alviti, Michele Gurzì, Valter Santilli, Marco Paoloni, Roberto Padua, Andrea Bernetti, Marco Bernardi, Massimiliano Mangone
The relationship between surgical technique and ankle biomechanical properties after surgery for acute rupture of the Achilles tendon (ATR) has not yet been fully investigated. Platelet-rich fibrin (PRF) matrices seem to play a central role in the complex processes of tendon healing. Our aim was to analyze the biomechanical characteristics, stiffness, and mechanical work of the ankle during walking in patients who had undergone surgery after ATR with and without PRF augmentation. We performed a retrospective review of all consecutive patients who had been treated with surgical repair after ATR...
May 2017: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/28466759/knee-ankle-foot-orthosis-with-powered-knee-for-support-in-the-elderly
#10
Peter Paul Pott, Sebastian Immanuel Wolf, Julia Block, Stefan van Drongelen, Markus Grün, Daniel Ww Heitzmann, Jürgen Hielscher, Andreas Horn, Roman Müller, Oliver Rettig, Ulrich Konigorski, Roland Werthschützky, Helmut Friedrich Schlaak, Thorsten Meiß
A prototype of a powered knee orthotic device was developed to determine whether fractional external torque and power support to the knee relieves the biomechanical loads and reduces the muscular demand for a subject performing sit-to-stand movements. With this demonstrator, consisting of the subsystems actuation, kinematics, sensors, and control, all relevant sensor data can be acquired and full control is maintained over actuator parameters. A series-elastic actuator based on a direct current motor provides up to 30 Nm torque to the knee via a hinge joint with an additional sliding degree of freedom...
May 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28460597/boosting-the-traditional-physiotherapist-approach-for-stroke-spasticity-using-a-sensorized-ankle-foot-orthosis-a-pilot-study
#11
Federica Tamburella, Juan C Moreno, Marco Iosa, Iolanda Pisotta, Febo Cincotti, Donatella Mattia, José L Pons, Marco Molinari
BACKGROUND: Spasticity is a motor disorder that is commonly treated manually by a physical therapist (PhT) stretching the muscles. Recent data on learning have demonstrated the importance of human-to-human interaction in improving rehabilitation: cooperative motor behavior engages specific areas of the motor system compared with execution of a task alone. OBJECTIVES: We hypothesize that PhT-guided therapy that involves active collaboration with the patient (Pt) through shared biomechanical visual biofeedback (vBFB) positively impacts learning and performance by the Pt during ankle spasticity treatment...
May 1, 2017: Topics in Stroke Rehabilitation
https://www.readbyqxmd.com/read/28459889/assessment-steps-and-treatment-tips-for-ankle-arthritis
#12
Adam Bitterman, Jeremy Alland, Johnny Lin, Simon Lee
The tibiotalar joint's unique biomechanics and associated structures carry management implications that vary from those in knee or hip arthritis.
May 2017: Journal of Family Practice
https://www.readbyqxmd.com/read/28458486/comparative-efficacy-of-progressive-resistance-exercise-and-biomechanical-ankle-platform-system-on-functional-indices-of-children-with-cerebral-palsy
#13
Faderera Adepoju, Talhatu Hamzat, Olusegun Akinyinka
BACKGROUND: Progressive Resistance Exercise (PRE) and Biomechanical Ankle Platform System (BAPS) are two of the protocols available in managing children with Cerebral Palsy (CP). The comparative effects of these modalities on selected functional indices of ambulatory type CP were the focus of this study. METHODS: Twenty-eight children with hemiplegic or diplegic CP receiving care at a tertiary health facility in Ibadan were consecutively recruited. They were systematically assigned into two intervention groups...
January 2017: Ethiopian Journal of Health Sciences
https://www.readbyqxmd.com/read/28456333/how-symmetric-are-metal-on-metal-hip-resurfacing-patients-during-gait-insights-for-the-rehabilitation
#14
Renan A Resende, Renata N Kirkwood, John F Rudan, Kevin J Deluzio
Metal-on-metal hip resurfacing patients demonstrate hip biomechanics closer to normal in comparison to total hip arthroplasty during gait. However, it is not clear how symmetric is the gait of hip resurfacing patients. Biomechanical data of 12 unilateral metal-on-metal hip resurfacing participants were collected during gait at a mean time of 45months (SD 24) after surgery. Ankle, knee, hip, pelvis and trunk kinematics and kinetics of both sides were measured with a motion and force-capture system. Principal component analysis and mean hypothesis' tests were used to compare the operated and healthy sides...
April 19, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28445855/speed-dependent-effects-of-laterally-wedged-insoles-on-gait-biomechanics-in-healthy-subjects
#15
Felix Kluge, Sebastian Krinner, Matthias Lochmann, Bjoern M Eskofier
Laterally wedged insoles have been shown to be effective for the reduction of the knee adduction moment and other biomechanical variables that are associated with the pathogenesis of knee osteoarthritis. However, inconclusive results such as adverse effects in individual subjects or even no group-wise wedge effects have been presented in different studies and it has been suggested to identify variables that potentially confound the wedge effect. The main objective of this study was the investigation of interaction effects of lateral wedges with walking speed, as different self-selected speeds have mainly been used in previous studies...
April 9, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28437637/analysis-of-free-moment-and-center-of-pressure-frequency-components-during-quiet-standing-using-magnitude-squared-coherence
#16
Dean C Hay, Mark P Wachowiak
To date, no postural studies have investigated the specific relationship between linear (anteroposterior (AP) and mediolateral (ML)) postural sway and the free moment (FM) over the range of biomechanically important frequencies. The goal of the current paper is to study the relationship between FM and the AP/ML movements during quiet standing with respect to individual frequencies. Mean squared coherence, which measures the degree of the relationship between two signals as a function of frequency, is employed to address this question...
April 21, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28437567/people-with-patellofemoral-oa-walk-with-different-pelvic-and-hip-kinematics-compared-to-healthy-aged-matched-controls
#17
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/28437130/lower-limb-and-trunk-biomechanics-after-fatigue-in-competitive-female-irish-dancers
#18
Catherine Y Wild, Avril Grealish, Diana Hopper
CONTEXT:   Because of the increasing popularity of participation in Irish dance, the incidence of lower limb injuries is high among this competitive population. OBJECTIVE:   To investigate the effects of fatigue on the peak lower limb and trunk angles as well as the peak lower limb joint forces and moments of competitive female Irish dancers during the performance of a dance-specific single-limb landing. DESIGN:   Cross-sectional study...
April 24, 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/28437129/acute-ankle-sprain-in-a-mouse-model-changes-in-knee-joint-space
#19
Tricia Hubbard-Turner, Erik A Wikstrom, Sophie Guderian, Michael J Turner
CONTEXT:   Ankle sprains remain the most common orthopaedic injury. Conducting long-term studies in humans is difficult and costly, so the long-term consequences of an ankle sprain are not entirely known. OBJECTIVE:   To measure knee-joint space after a single surgically induced ankle sprain in mice. DESIGN:   Randomized controlled trial. SETTING:   University research laboratory. PATIENTS OR OTHER PARTICIPANTS:   Thirty male mice (CBA/2J) were randomly placed into 1 of 3 surgical groups: the transected calcaneofibular ligament (CFL) group, the transected anterior talofibular ligament/CFL group, and a sham treatment group...
April 24, 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/28436878/biofeedback-for-gait-retraining-based-on-real-time-estimation-of-tibiofemoral-joint-contact-forces
#20
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
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