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ankle biomechanics

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https://www.readbyqxmd.com/read/28649018/rear-foot-kinematics-when-wearing-lateral-wedge-insoles-and-foot-alignment-influence-the-effect-of-knee-adduction-moment-for-medial-knee-osteoarthritis
#1
Tomonori Sawada, Kenji Tanimoto, Kazuki Tokuda, Yoshitaka Iwamoto, Yuta Ogata, Masaya Anan, Makoto Takahashi, Nobuhiro Kito, Koichi Shinkoda
Lateral wedge insoles (LWIs) are prescribed for patients with medial knee osteoarthritis to reduce the external knee adduction moment (KAM). However, the biomechanical effects of LWIs are limited in some patients. The purpose of this study was to investigate whether the biomechanical effects of LWIs depend on individual foot alignment and to examine the relationship between change in KAM and changes in foot and ankle biomechanics when wearing LWIs. Twenty-one patients participated in this study. They were categorized into normal or abnormal foot groups based on the foot posture index (FPI)...
June 15, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28646745/automatic-postural-responses-are-generated-according-to-feet-orientation-and-perturbation-magnitude
#2
Nametala Maia Azzi, Daniel Boari Coelho, Luis Augusto Teixeira
This investigation aimed to assess the effect of feet orientation angle in upright stance on automatic postural responses (APRs) to mechanical perturbations of different magnitudes. Perturbation was produced by releasing suddenly a load attached to the participant's trunk, leading to forward body sway. We evaluated APRs to loads corresponding to 5% (low) and 10% (high) of the participant's body weight, comparing the following feet orientations: parallel, preferred (M=10.46°), 15° and 30° for each foot regarding the body midline...
June 21, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28641058/acute-kinematics-changes-in-marathon-runners-using-different-footwear
#3
Tania Socorro Amorim Soares, Camila Fonseca de Oliveira, Federico Pizzuto, Rui Manuel Garganta, João Paulo Vila-Boas, Mario Casimiro da Anunciação Paiva
The effects of running with or without shoes on injury prevention have been extensively studied, and several investigations have assessed biomechanical differences between them. However, findings are not consensual and further insights on biomechanical load associated with differently shod or barefoot conditions may be needed. This study aimed to observe if habitually shod marathon runners show acute alterations when running barefoot or with minimalist shoes, and to determine whether the running kinematical adaptations of wearing minimalist shoes were similar to barefoot running...
June 22, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28634682/searching-for-the-sweet-spot-the-foot-rotation-and-parallel-engagement-of-ankle-ligaments-in-maximizing-injury-tolerance
#4
Bingbing Nie, Jason L Forman, Alexander R Mait, John-Paul Donlon, Matthew B Panzer, Richard W Kent
Ligament sprains, defined as tearing of bands of fibrous tissues within ligaments, account for a majority of injuries to the foot and ankle complex in field-based sports. External rotation of the foot is considered the primary injury mechanism of syndesmotic ankle sprains with concomitant flexion and inversion/eversion associated with particular patterns of ligament trauma. However, the influence of the magnitude and direction of loading vectors to the ankle on the in situ stress state of the ligaments has not been quantified in the literature...
June 20, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/28633164/ann-prediction-of-ligament-stiffnesses-for-the-enhanced-predictive-ability-of-a-patient-specific-computational-foot-ankle-model
#5
Ruchi Chande, Jennifer S Wayne
Computational models of diarthrodial joints serve to inform the biomechanical function of these structures, and as such, must be supplied appropriate inputs for performance that is representative of actual joint function. Inputs for these models are sourced from both imaging modalities as well as literature. The latter is often the source of mechanical properties for soft tissues, like ligament stiffnesses; however, such data is not always available for all soft tissues nor is it known for patient specific work...
June 20, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28632776/dynamic-knee-valgus-alignment-influences-impact-attenuation-in-the-lower-extremity-during-the-deceleration-phase-of-a-single-leg-landing
#6
Akihiro Tamura, Kiyokazu Akasaka, Takahiro Otsudo, Jyunya Shiozawa, Yuka Toda, Kaori Yamada
Dynamic knee valgus during landings is associated with an increased risk of non-contact anterior cruciate ligament (ACL) injury. In addition, the impact on the body during landings must be attenuated in the lower extremity joints. The purpose of this study was to investigate landing biomechanics during landing with dynamic knee valgus by measuring the vertical ground reaction force (vGRF) and angular impulses in the lower extremity during a single-leg landing. The study included 34 female college students, who performed the single-leg drop vertical jump...
2017: PloS One
https://www.readbyqxmd.com/read/28619268/ankle-hindfoot-after-calcaneal-fractures-a-biomechanical-study
#7
Xu Can, Li Mingqing, Wang Chenggong, Li Kanghua, Liu Hua
INTRODUCTION: Both the overall shape of the calcaneus and anatomical reduction of joint congruity are important prognostic factors. However, there is a significant lack of biomechanical data supporting the clinical importance of calcaneus height, length and heel width. The objective of this study was to determine the effects of abnormal calcaneus morphology on ankle-hindfoot biomechanics. HYPOTHESIS: The normal biomechanics of the ankle-hindfoot would be severely disrupted by the abnormal calcaneus morphology...
June 12, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28611612/spasticity-measurement-based-on-tonic-stretch-reflex-threshold-in-children-with-cerebral-palsy-using-the-pedianklebot
#8
Marco Germanotta, Juri Taborri, Stefano Rossi, Flaminia Frascarelli, Eduardo Palermo, Paolo Cappa, Enrico Castelli, Maurizio Petrarca
Nowadays, objective measures are becoming prominent in spasticity assessment, to overcome limitations of clinical scales. Among others, Tonic Stretch Reflex Threshold (TSRT) showed promising results. Previous studies demonstrated the validity and reliability of TSRT in spasticity assessment at elbow and ankle joints in adults. Purposes of the present study were to assess: (i) the feasibility of measuring TSRT to evaluate spasticity at the ankle joint in children with Cerebral Palsy (CP), and (ii) the correlation between objective measures and clinical scores...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28601565/gait-analysis-of-young-male-patients-diagnosed-with-primary-bladder-neck-obstruction
#9
Matteo Zago, Tommaso Ciro Camerota, Stefano Pisu, Daniela Ciprandi, Chiarella Sforza
Primary bladder neck obstruction (PBNO) represents an inappropriate or inadequate relaxation of the bladder neck during micturition. Based on the observation of an increased rate of postural imbalances in male patients with PBNO, we hypothesized a possible role of an unbalanced biomechanics of the pelvis on urethral sphincters activity. Our aim was to identify kinematic imbalances, usually disregarded in PBNO patients, and which could eventually be involved in the etiopathogenesis of the disease. Seven male adult patients (39...
August 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28594508/lateral-ankle-instability-and-peroneal-tendon-pathology
#10
Michael Isiah Sandlin, Cyrus E Taghavi, Timothy P Charlton, Richard D Ferkel
Surgeons should understand the anatomic, vascular, biomechanical, and predisposing factors related to lateral ankle instability and peroneal tendon injuries, including peroneal tendinitis and tenosynovitis, peroneal tendon tears and ruptures, as well as peroneal tendon subluxation and dislocation. Surgeons should understand the treatment options and recommendations for patients who have lateral ankle instability and peroneal tendon injuries from the perspective of a sports medicine foot and ankle specialist...
February 15, 2017: Instructional Course Lectures
https://www.readbyqxmd.com/read/28593086/kinematic-and-kinetic-variables-differ-between-kettlebell-swing-styles
#11
Garrett S Bullock, Abigail C Schmitt, Jason M Shutt, Gray Cook, Robert J Butler
BACKGROUND: Kettlebell (KB) and indian club swings (ICS) are used diversely for developing strength and power. It has been proposed that multiple swing techniques can be used interchangeably to elicit similar adaptations within performance training. Hypothesis/Purpose: It was hypothesized that there will be not be a difference in peak joint angles between types of swings. Furthermore, given the nature of the overhead kettlebell swing (OKS), it was hypothesized that the OKS will be associated with a greater cycle time and a greater vertical impulse compared to shoulder height swing (SKS) and ICS...
June 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28587934/ankle-and-knee-biomechanics-during-normal-walking-following-ankle-plantarflexor-fatigue
#12
Michael A Hunt, Gillian L Hatfield
The purpose of this study was to investigate the immediate effects of unilateral ankle plantarflexor fatigue on bilateral knee and ankle biomechanics during gait. Lower leg kinematics, kinetics, and muscle activation were assessed before and after an ankle plantarflexor fatiguing protocol in 31 healthy individuals. Fatigue (defined as >10% reduction in maximal isometric ankle plantarflexor torque production and a downward shift in the median power frequency of both heads of the gastrocnemius muscle of the fatigued limb) was achieved in 18 individuals, and only their data were used for analysis purposes...
August 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28587794/biomechanical-analysis-of-ankle-ligamentous-sprain-injury-cases-from-televised-basketball-games-understanding-when-how-and-why-ligament-failure-occurs
#13
Emmanouil Panagiotakis, Kam-Ming Mok, Daniel Tik-Pui Fong, Anthony M J Bull
OBJECTIVES: Ankle sprains due to landing on an opponent's foot are common in basketball. There is no analysis to date that provides a quantification of this injury mechanism. The aim of this study was to quantify the kinematics of this specific injury mechanism and relate this to lateral ankle ligament biomechanics. DESIGN: Case series. METHODS: The model-based image-matching technique was used to quantify calcaneo-fibular-talar kinematics during four ankle inversion sprain injury incidents in televised NBA basketball games...
May 25, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28587575/comparison-of-multisegmental-foot-and-ankle-motion-between-total-ankle-replacement-and-ankle-arthrodesis-in-adults
#14
Sang Gyo Seo, Eo Jin Kim, Doo Jae Lee, Kee Jeong Bae, Kyoung Min Lee, Dong Yeon Lee
BACKGROUND: Total ankle replacement (TAR) and ankle arthrodesis (AA) are usually performed for severe ankle arthritis. We compared postoperative foot segmental motion during gait in patients treated with TAR and AA. METHODS: Gait analysis was performed in 17 and 7 patients undergoing TAR and AA, respectively. Subjects were evaluated using a 3-dimensional multisegmental foot model with 15 markers. Temporal gait parameters were calculated. The maximum and minimum values and the differences in hallux, forefoot, hindfoot, and arch in 3 planes (sagittal, coronal, transverse) were compared between the 2 groups...
May 1, 2017: Foot & Ankle International
https://www.readbyqxmd.com/read/28579954/linear-parameter-varying-identification-of-dynamic-joint-stiffness-during-time-varying-voluntary-contractions
#15
Mahsa A Golkar, Ehsan Sobhani Tehrani, Robert E Kearney
Dynamic joint stiffness is a dynamic, nonlinear relationship between the position of a joint and the torque acting about it, which can be used to describe the biomechanics of the joint and associated limb(s). This paper models and quantifies changes in ankle dynamic stiffness and its individual elements, intrinsic and reflex stiffness, in healthy human subjects during isometric, time-varying (TV) contractions of the ankle plantarflexor muscles. A subspace, linear parameter varying, parallel-cascade (LPV-PC) algorithm was used to identify the model from measured input position perturbations and output torque data using voluntary torque as the LPV scheduling variable (SV)...
2017: Frontiers in Computational Neuroscience
https://www.readbyqxmd.com/read/28576193/hindfoot-arthrodesis-for-the-elective-and-posttraumatic-foot-deformity
#16
REVIEW
John J Stapleton, Thomas Zgonis
Triple (talonavicular, subtalar, and calcaneocuboid) joint arthrodesis and most recently double (talonavicular and subtalar) joint arthrodesis have been well proposed in the literature for surgical repair of the elective, posttraumatic, and/or neuropathic hindfoot deformities. The articulation of the hindfoot with the ankle and midfoot is multiaxial, and arthrodesis of these joints can significantly alter the lower extremity biomechanical manifestations by providing anatomic correction and alignment. This article reviews the indications and preoperative planning for some of the most common procedures to address the hindfoot deformity...
July 2017: Clinics in Podiatric Medicine and Surgery
https://www.readbyqxmd.com/read/28558915/distal-skeletal-tibia-assessed-by-hr-pqct-is-highly-correlated-with-femoral-and-lumbar-vertebra-failure-loads
#17
Andres Kroker, Ryan Plett, Kyle K Nishiyama, David D McErlain, Clara Sandino, Steven K Boyd
Dual energy X-ray absorptiometry (DXA) is the standard for assessing fragility fracture risk using areal bone mineral density (aBMD), but only explains 60-70% of the variation in bone strength. High-resolution peripheral quantitative computed tomography (HR-pQCT) provides 3D-measures of bone microarchitecture and volumetric bone mineral density (vBMD), but only at the wrist and ankle. Finite element (FE) models can estimate bone strength with 86-95% precision. The purpose of this study is to determine how well vBMD and FE bone strength at the wrist and ankle relate to fracture strength at the hip and spine, and to compare these relationships with DXA measured directly at those axial sites...
May 18, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28554150/effect-of-valgus-knee-alignment-on-gait-biomechanics-in-healthy-women
#18
Matthew C Hoch, Joshua T Weinhandl
The purpose of this study was to compare lower extremity kinematics and kinetics between women with greater or lesser degrees of valgus knee alignment during gait. Nine women with greater valgus knee alignment (11.9±1.6°) were compared to nine women with lesser valgus knee alignment (6.6±2.4°). Participants completed a biomechanical assessment of overground walking for the right limb. Dependent variables included sagittal and frontal plane joint angles and moments for the hip, knee, and ankle at peak vertical ground reaction force, along with knee abduction angular impulse...
August 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28552927/fixation-of-distal-fibular-fractures-a-biomechanical-study-of-plate-fixation-techniques
#19
Jiri Marvan, Zdenek Horak, Miloslav Vilimek, Lukas Horny, David Kachlik, Vaclav Baca
Ankle fractures are complex injuries with variable prognoses that depend upon many factors. The aim of the treatment is to restore the ankle joint biomechanical stability with maximum range of motion. Most ankle fractures are fibular fractures, which have a typical oblique fracture line in the distal fibula located in the area of the tibiofibular syndesmosis. The aim of this study was to simulate numerically several fixation techniques of the distal fibular fractures, evaluate their stability, determine their impact on surrounding tissue load, and correlate the results to clinical treatment experience...
2017: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/28552921/the-influence-of-landing-mat-composition-on-ankle-injury-risk-during-a-gymnastic-landing-a-biomechanical-quantification
#20
Xiaofei Xiao, Weiya Hao, Xuhong Li, Bingjun Wan, Gongbing Shan
PURPOSE: About 70% injury of gymnasts happened during landing - an interaction between gymnast and landing mat. The most injured joint is the ankle. The current study examined the effect of mechanical properties of landing mat on ankle loading with aims to identify means of decreasing the risk of ankle injury. METHOD: Gymnastic skill - salto backward stretched with 3/2 twist was captured by two high-speed camcorders and digitized by using SIMI-Motion software. A subject-specific, 14-segment rigid-body model and a mechanical landing-mat model were built using BRG...
2017: Acta of Bioengineering and Biomechanics
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