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foot biomechanics

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https://www.readbyqxmd.com/read/28513212/an-optical-fiber-based-smart-textile-smart-socks-to-manage-biomechanical-risk-factors-associated-with-diabetic-foot-amputation
#1
Bijan Najafi, Hooman Mohseni, Gurtej S Grewal, Talal K Talal, Robert A Menzies, David G Armstrong
OBJECTIVE: This study aimed to validate a smart-textile based on fiber-optics for simultaneous measurement of plantar temperature, pressure, and joint angles in patients with diabetic peripheral neuropathy (DPN). METHODS: After in-vitro validation in the laboratory, 33 eligible subjects with DPN were recruited (age: 58 ± 8 years, BMI: 31.5 ± 8 kg/m(2)) for assessing plantar pressure and temperature during habitual gait-speed in a clinical-setting. All participants were asked to walk at their habitual speed while wearing a pair of sensorized socks made from highly flexible fiber optics (SmartSox)...
May 1, 2017: Journal of Diabetes Science and Technology
https://www.readbyqxmd.com/read/28506273/inertial-measurement-systems-for-segments-and-joints-kinematics-assessment-towards-an-understanding-of-the-variations-in-sensors-accuracy
#2
Karina Lebel, Patrick Boissy, Hung Nguyen, Christian Duval
BACKGROUND: Joints kinematics assessment based on inertial measurement systems, which include attitude and heading reference system (AHRS), are quickly gaining in popularity for research and clinical applications. The variety of the tasks and contexts they are used in require a deep understanding of the AHRS accuracy for optimal data interpretation. However, published accuracy studies on AHRS are mostly limited to a single task measured on a limited number of segments and participants...
May 15, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28505593/foot-ankle-complex-injury-risk-curves-using-calcaneus-bone-mineral-density-data
#3
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/28503539/differences-in-pes-planus-and-pes-cavus-subtalar-eversion-inversion-before-and-after-prolonged-running-using-a-two-dimensional-digital-analysis
#4
Charlotte Sinclair, Ulla Svantesson, Rita Sjöström, Marie Alricsson
In sports, there is a constant discussion about the hyper-pronation and supination of the foot during loading and its relation to injuries or discomfort. The purpose of the present study was to investigate the possible differences in the subtalar joint in the midstance phase of running, between individuals with Pes Planus and Pes Cavus, after 5 min and 45 min of running. Thirty-four subjects, meeting the requirements for Pes Planus (30 feet) and Pes Cavus (35 feet), according to the criteria for Medial Longitudinal Arch-angle, were included in the study...
April 2017: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/28503379/a-public-dataset-of-running-biomechanics-and-the-effects-of-running-speed-on-lower-extremity-kinematics-and-kinetics
#5
Reginaldo K Fukuchi, Claudiane A Fukuchi, Marcos Duarte
BACKGROUND: The goals of this study were (1) to present the set of data evaluating running biomechanics (kinematics and kinetics), including data on running habits, demographics, and levels of muscle strength and flexibility made available at Figshare (DOI: 10.6084/m9.figshare.4543435); and (2) to examine the effect of running speed on selected gait-biomechanics variables related to both running injuries and running economy. METHODS: The lower-extremity kinematics and kinetics data of 28 regular runners were collected using a three-dimensional (3D) motion-capture system and an instrumented treadmill while the subjects ran at 2...
2017: PeerJ
https://www.readbyqxmd.com/read/28503144/rigid-ankle-foot-orthosis-deteriorates-mediolateral-balance-control-and-vertical-braking-during-gait-initiation
#6
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/28499159/sensitivity-of-biomechanical-outcomes-to-independent-variations-of-hindfoot-and-forefoot-stiffness-in-foot-prostheses
#7
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/28497718/the-biomechanical-effects-and-perceived-comfort-of-textile-fabricated-insoles-during-straight-line-walking
#8
Wai-Ting Lo, Del P Wong, Kit-Lun Yick, Sun Pui Ng, Joanne Yip
BACKGROUND: Orthotic insoles that are made of foam material often have less breathability and thus cause discomfort to the wearer. Given that a sandwich structure offers better porosity and breathability that would improve comfort, the impact of custom-made insoles made with three-dimensional spacer fabric is studied. OBJECTIVES: To examine the biomechanical effects and subjective comfort of spacer-fabric insoles during walking. STUDY DESIGN: Repeated measures...
May 1, 2017: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/28497049/biomechanical-analysis-of-cuboid-osteotomy-lateral-column-lengthening-for-stage-ii-b-adult-acquired-flatfoot-deformity-a-cadaveric-study
#9
Haichao Zhou, Haoyang Ren, Chunguang Li, Jiang Xia, Guangrong Yu, Yunfeng Yang
Purpose. To investigate the effect of cuboid osteotomy lateral column lengthening (LCL) for the correction of stage II B adult-acquired flatfoot deformity in cadaver. Methods. Six cadaver specimens were loaded to 350 N. Flatfoot models were established and each was evaluated radiographically and pedobarographically in the following conditions: (1) intact foot, (2) flatfoot, and (3) cuboid osteotomy LCL (2, 3, 4, and 5 mm). Results. Compared with the flatfoot model, the LCLs showed significant correction of talonavicular coverage on anteroposterior radiographs and talus-first metatarsal angle on both anteroposterior and lateral radiographs (p < ...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28488928/do-subjective-assessments-of-running-patterns-reflect-objective-parameters
#10
Thibault Lussiana, Cyrille Gindre, Laurent Mourot, Kim Hébert-Losier
Running patterns are often categorized into subgroups according to common features before data analysis and interpretation. The Volodalen(®) method is a simple field-based tool used to classify runners into aerial or terrestrial using a 5-item subjective rating scale. We aimed to validate the Volodalen(®) method by quantifying the relationship between its subjective scores and 3D biomechanical measures. Fifty-four runners ran 30 s on a treadmill at 10, 12, 14, 16, and 18 km h(-1) while their kinematics were assessed subjectively using the Volodalen(®) method and objectively using 3D motion capture...
May 10, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28482203/transition-from-shod-to-barefoot-alters-dynamic-stability-during-running
#11
Antonis Ekizos, Alessandro Santuz, Adamantios Arampatzis
INTRODUCTION: Barefoot running recently received increased attention, with controversial results regarding its effects on injury risk and performance. Numerous studies examined the kinetic and kinematic changes between the shod and the barefoot condition. Intrinsic parameters such as the local dynamic stability could provide new insight regarding neuromuscular control when immediately transitioning from one running condition to the other. We investigated the local dynamic stability during the change from shod to barefoot running...
April 27, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28480842/dinamics-of-knee-joint-space-asymmetry-on-x-ray-as-a-marker-of-knee-osteoarthritis-rehabilitation-efficacy
#12
N Sheveleva, L Minbayeva, Y Belyayeva
Reducing of articular cartilage functional volume in knee joint osteoarthritis occurs unevenly and accompanied with pathological changes of lower limb axis as a result of connective tissue and muscle structures dysfunction. Evaluation of X-ray knee joint space asymmetry seems to be informative to analyze the dynamics of lower extremities biomechanical imbalances characteristic for knee joint osteoarthritis. However, standardized method of X-ray joint space determining does not include its symmetry calculation...
March 2017: Georgian Medical News
https://www.readbyqxmd.com/read/28473871/lateral-wedges-with-and-without-custom-arch-support-for-people-with-medial-knee-osteoarthritis-and-pronated-feet-an-exploratory-randomized-crossover-study
#13
Michael A Hunt, Judit Takacs, Natasha M Krowchuk, Gillian L Hatfield, Rana S Hinman, Ryan Chang
BACKGROUND: Pronated foot posture is associated with many clinical and biomechanical outcomes unique to medial compartment knee osteoarthritis (OA). Though shoe-worn insole treatment, including lateral wedges, is commonly studied in this patient population, their effects on the specific subgroup of people with medial knee OA and concomitant pronated feet are unknown. The purpose of this study was to evaluate whether lateral wedge insoles with custom arch support are more beneficial than lateral wedge insoles alone for knee and foot symptoms in people with medial tibiofemoral knee osteoarthritis (OA) and pronated feet...
2017: Journal of Foot and Ankle Research
https://www.readbyqxmd.com/read/28466759/knee-ankle-foot-orthosis-with-powered-knee-for-support-in-the-elderly
#14
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/28463819/the-reliability-of-the-adelaide-in-shoe-foot-model
#15
Chris Bishop, Susan Hillier, Dominic Thewlis
Understanding the biomechanics of the foot is essential for many areas of research and clinical practice such as orthotic interventions and footwear development. Despite the widespread attention paid to the biomechanics of the foot during gait, what largely remains unknown is how the foot moves inside the shoe. This study investigated the reliability of the Adelaide In-Shoe Foot Model, which was designed to quantify in-shoe foot kinematics and kinetics during walking. Intra-rater reliability was assessed in 30 participants over five walking trials whilst wearing shoes during two data collection sessions, separated by one week...
April 18, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28460597/boosting-the-traditional-physiotherapist-approach-for-stroke-spasticity-using-a-sensorized-ankle-foot-orthosis-a-pilot-study
#16
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/28456333/how-symmetric-are-metal-on-metal-hip-resurfacing-patients-during-gait-insights-for-the-rehabilitation
#17
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/28449699/shoe-stiffening-inserts-for-first-metatarsophalangeal-joint-osteoarthritis-the-simple-trial-study-protocol-for-a-randomised-controlled-trial
#18
Shannon E Munteanu, Karl B Landorf, Jodie A McClelland, Edward Roddy, Flavia M Cicuttini, Alan Shiell, Maria Auhl, Jamie J Allan, Andrew K Buldt, Hylton B Menz
BACKGROUND: This article describes the design of a parallel-group, participant- and assessor-blinded randomised controlled trial comparing the effectiveness of shoe-stiffening inserts versus sham shoe insert(s) for reducing pain associated with first metatarsophalangeal joint (MTPJ) osteoarthritis (OA). METHODS: Ninety participants with first MTPJ OA will be randomised to receive full-length shoe-stiffening insert(s) (Carbon Fibre Spring Plate, Paris Orthotics, Vancouver, BC, Canada) plus rehabilitation therapy or sham shoe insert(s) plus rehabilitation therapy...
April 27, 2017: Trials
https://www.readbyqxmd.com/read/28422559/the-influence-of-ambulatory-aid-on-lower-extremity-muscle-activation-during-gait
#19
Michael Sanders, Anton E Bowden, Spencer Baker, Ryan Jensen, McKenzie Nichols, Matthew K. Seeley
CONTEXT: Foot and ankle injuries are common, and often require a non-weight bearing period of immobilization for the involved leg. This non-weight bearing period usually results in muscle atrophy for the involved leg. There is a dearth of objective data describing muscle activation for different ambulatory aids that are used during the aforementioned non-weight bearing period. OBJECTIVE: To compare activation amplitudes for four leg muscles during (1) able-bodied gait and (2) ambulation involving three different ambulatory aids that can be used during the acute phase of foot and ankle injury care...
April 19, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28417667/immediate-and-short-term-biomechanical-adaptation-of-habitual-barefoot-runners-who-start-shod-running
#20
Ivan P H Au, Fannie O Y Lau, Winko W An, Janet H Zhang, Tony L Chen, Roy T H Cheung
This study investigated the immediate and short-term effects of minimalist shoes (MS) and traditional running shoes (TRS) on vertical loading rates, foot strike pattern and lower limb kinematics in a group of habitual barefoot runners. Twelve habitual barefoot runners were randomly given a pair of MS or TRS and were asked to run with the prescribed shoes for 1 month. Outcome variables were obtained before, immediate after and 1 month after shoe prescription. Average and instantaneous vertical loading rates at the 1-month follow-up were significantly higher than that at the pre-shod session (P < 0...
April 18, 2017: Journal of Sports Sciences
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