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ankle biomechanics

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https://www.readbyqxmd.com/read/28922314/temporal-indices-of-ankle-clonus-and-relationship-to-electrophysiologic-and-clinical-measures-in-persons-with-spinal-cord-injury
#1
Kathleen J Manella, Kathryn E Roach, Edelle C Field-Fote
BACKGROUND AND PURPOSE: Clonus arising from plantar flexor hyperreflexia is a phenomenon that is commonly observed in persons with spastic hypertonia. We assessed the temporal components of a biomechanical measure to quantify ankle clonus, and validated these in persons with spasticity due to spinal cord injury. METHODS: In 40 individuals with chronic (>1 year) spinal cord injury, we elicited ankle clonus using a standardized mechanical perturbation (drop test)...
October 2017: Journal of Neurologic Physical Therapy: JNPT
https://www.readbyqxmd.com/read/28915105/variations-of-ankle-foot-orthosis-constrained-movements-increase-ankle-range-of-movement-while-maintaining-power-output-of-recumbent-cycling
#2
Puteri N F Hamdan, Nur Azah Hamzaid, Juliana Usman, Md Anamul Islam, Victor S P Kean, Ahmad K Abdul Wahab, Nazirah Hasnan, Glen M Davis
Previous research investigated recumbent cycle power output (PO) from the perspective of knee and hip joint biomechanics. However, ankle-foot biomechanics and, in particular, the effect of ankle-foot orthosis (AFO)-constrained movements on cycle PO has not been widely explored. Therefore, the purpose of this study was to determine whether AFOs of a fixed position (FP) and in dorsi-plantarflexion (DPF)-, dorsiflexion (DF)- and plantarflexion (PF)-constrained movements might influence PO during voluntary recumbent cycling exercises...
September 15, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28900562/a-biomechanical-comparison-among-three-kinds-of-rebound-type-jumps-in-female-collegiate-athletes
#3
Miki Nariai, Naruto Yoshida, Atsushi Imai, Kazumichi Ae, Ryo Ogaki, Hirokazu Suhara, Hitoshi Shiraki
BACKGROUND: Single-legged drop jumps (SDJ), single-legged repetitive jumps (SRJ), and single-legged side hops (SSH) are often used as plyometric training and functional performance tests. Differences in the kinetics and kinematic characteristics of lower extremity joints during these jumps are unclear. HYPOTHESIS/PURPOSE: The purpose of this study was to investigate the joint motion and mechanical work of the takeoff leg from foot contact to foot-off during SDJ, SRJ, and SSH in the sagittal and frontal planes in female athletes...
August 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28899558/arthroscopically-measured-syndesmotic-stability-after-screw-vs-suture-button-fixation-in-a-cadaveric-model
#4
Bart Lubberts, Bryan G Vopat, Jonathon C Wolf, Umile Giuseppe Longo, Christopher W DiGiovanni, Daniel Guss
BACKGROUND: Appropriate management of ankle syndesmotic instability is needed to prevent the development of complications. Previous biomechanical studies have evaluated movement of the fibula after screw or suture button fixations with different results, most likely being caused by variations in experimental setups that did not mirror the in vivo clinical setting. This study aimed to arthroscopically compare in a cadaveric model the stability of syndesmotic fixation with either a suture button or syndesmotic screw...
August 31, 2017: Injury
https://www.readbyqxmd.com/read/28888229/changes-in-ankle-joint-motion-after-supramalleolar-osteotomy-a-cadaveric-model
#5
Hak Jun Kim, Eui Dong Yeo, Im Joo Rhyu, Soon-Hyuck Lee, Yeon Soo Lee, Young Koo Lee
BACKGROUND: Malalignment of the ankle joint has been found after trauma, by neurological disorders, genetic predisposition and other unidentified factors, and results in asymmetrical joint loading. For a medial open wedge supramalleolar osteotomy(SMO), there are some debates as to whether concurrent fibular osteotomy should be performed. We assessed the changes in motion of ankle joint and plantar pressure after supramalleolar osteotomy without fibular osteotomy. METHODS: Ten lower leg specimens below the knee were prepared from fresh-frozen human cadavers...
September 9, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28885156/the-vspa-foot-a-quasi-passive-ankle-foot-prosthesis-with-continuously-variable-stiffness
#6
Max K Shepherd, Elliott J Rouse
Most commercially available prosthetic feet do not exhibit a biomimetic torque-angle relationship, and are unable to modulate their mechanics to assist with other mobility tasks, such as stairs and ramps. In this work, we present a quasi-passive ankle-foot prosthesis with a customizable torque-angle curve and an ability to quickly modulate ankle stiffness between tasks. The customizable torque-angle curve is obtained with a cam-based transmission and a fiberglass leaf spring. To achieve variable stiffness, the leaf spring's support conditions can be actively modulated by a small motor, shifting the torque-angle curve to be more or less stiff...
September 7, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28877943/systematic-review-of-the-evidence-on-orthotic-devices-for-the-management-of-knee-instability-related-to-neuromuscular-and-central-nervous-system-disorders
#7
Catriona McDaid, Debra Fayter, Alison Booth, Joanne O'Connor, Rocio Rodriguez-Lopez, Dorothy McCaughan, Roy Bowers, Cynthia P Iglesias, Simon Lalor, Rory J O'Connor, Margaret Phillips, Gita Ramdharry
OBJECTIVES: To assess the effectiveness of orthotic devices for the management of instability of the knee in adults with a neuromuscular disorder or central nervous system disorder. DESIGN: A systematic review of primary studies. SETTING: Community. PARTICIPANTS: Adults with a neuromuscular disorder or central nervous system disorder and impaired walking ability due to instability of the knee. INTERVENTIONS: Orthoses with the clinical aim of controlling knee instability, for example, knee-ankle-foot orthoses, ankle-foot orthoses and knee orthoses or mixed design with no restrictions in design or material...
September 5, 2017: BMJ Open
https://www.readbyqxmd.com/read/28874066/the-role-of-the-accessory-malleolar-ossicles-and-malleolar-avulsion-fractures-in-lateral-ankle-ligament-reconstruction
#8
Matthew M Reiner, Jonathan J Sharpe
While it is well known that ankle sprains are one of the most common injuries in the United States, predictive factors regarding failure of conservative treatment are not well known. There are many biomechanical and epidemiological factors that play a role in recurrence and failure of conservative treatment, but most cases are able to be treated with immobilization and/or rest, ice, elevation, physical therapy, and bracing. We propose that one important risk factor is often overlooked simply due to the fact that a vast majority of these cases resolve without the need for surgery...
September 1, 2017: Foot & Ankle Specialist
https://www.readbyqxmd.com/read/28871904/the-biomechanics-and-motor-control-of-tap-dancing
#9
Priscila Rocha, Jodie McClelland, Tony Sparrow, Meg E Morris
Although tap dancing is a popular dance genre, little is known about the biomechanics and motor control of this complex motor skill. We conducted a detailed 3D kinematic analysis of movement timing, amplitude, and symmetry in three experienced female tap dancers. Kinematic analyzes of three basic tap dance steps (nerve beats, brush brush stamps, and heel ball walks) were undertaken. A 10-camera Vicon motion analysis system was used to collect the data. The results showed the feet and knees to play a major role in movement execution...
September 15, 2017: Journal of Dance Medicine & Science
https://www.readbyqxmd.com/read/28869903/biomechanical-differences-between-cases-with-suspected-chronic-exertional-compartment-syndrome-and-asymptomatic-controls-during-running
#10
Andrew Roberts, David Roscoe, David Hulse, Alexander N Bennett, Sharon Dixon
Chronic exertional compartment syndrome (CECS) has been hypothesised, following clinical observations, to be the result of abnormal biomechanics predominantly at the ankle. Treatment of CECS through running re-education to correct these abnormalities has been reported to improve symptoms. However no primary research has been carried out to investigate the movement patterns of those with CECS. This study aimed to compare the running kinematics and muscle activity of cases with CECS and asymptomatic controls...
August 30, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28867057/current-concepts-regarding-total-ankle-replacement-as-a-viable-treatment-option-for-advanced-ankle-arthritis-what-you-need-to-know
#11
REVIEW
Christopher L Reeves, Amber M Shane, Ryan Vazales
Much of the current literature suggests that total ankle replacement (TAR) is no longer an inferior or fringe treatment for advanced ankle arthritis compared with ankle fusion, but rather a viable option for recalcitrant arthritic ankle pathology in the correct patient population. In this article, current concepts associated with successful outcomes for TAR are discussed with an emphasis on ankle joint anatomy and biomechanics, preoperative planning and patient selection, understanding pathomechanics and soft tissue balancing, as well as the surgeon's learning curve...
October 2017: Clinics in Podiatric Medicine and Surgery
https://www.readbyqxmd.com/read/28867049/nonsurgical-treatment-of-ankle-arthritis
#12
REVIEW
Michael A Gentile
Nonsurgical treatment of ankle arthritis can be a short-term fix or a long-term solution. An understanding of the biomechanics of the ankle is helpful in the successful use of orthotics and bracing. Pharmacologic and/or biologic treatments can be used exclusively or in concert with mechanical interventions to decrease pain, improve function, and potentially extend the life span of an arthritic ankle.
October 2017: Clinics in Podiatric Medicine and Surgery
https://www.readbyqxmd.com/read/28866303/fuzzy-inference-model-evaluating-turn-for-parkinson-s-disease-patients
#13
Christopher Ornelas-Vences, Luis Pastor Sanchez-Fernandez, Luis Alejandro Sanchez-Perez, Alejandro Garza-Rodriguez, Albino Villegas-Bastida
Parkinson's disease is a chronic illness that affects motor skills. The Unified Parkinson's Disease Rating Scale sponsored by the Movement Disorder Society (MDS-UPDRS) quantifies the current state of the disease based on clinician's observations. In this scale, turning is part of the gait assessment, yet specific guidelines on which features to observe and rate are still unclear. What is more, only visual impairment detection is used as the main subjective rating tool. In this respect, four biomechanical features are extracted from sensors worn on the lower limbs in this work...
August 30, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28857115/muscle-function-and-coordination-of-stair-ascent
#14
Nicole Harper, Jason Wilken, Richard Neptune
Stair ascent is an activity of daily living and necessary for maintaining independence in community environments. One challenge to improving an individual's ability to ascend stairs is a limited understanding of how lower-limb muscles work in synergy to perform stair ascent. Through dynamic coupling muscles may perform multiple functions and require contributions from other muscles to perform a task successfully. The purpose of this study was to identify the functional roles of individual muscles during stair ascent and the mechanisms by which muscles work together to perform specific subtasks...
August 31, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28853317/shoe-drop-reduction-influences-the-lower-limb-biomechanics-of-children-tennis-players-during-an-open-stance-forehand-a-longitudinal-study
#15
Alexis Herbaut, Emilie Simoneau-Buessinger, Franck Barbier, Christophe Gillet, Maxime Roux, Nils GuéGuen, Pascale Chavet
Compared to traditional tennis shoes, using 0-drop shoes was shown to induce an immediate switch from rear- to forefoot strike pattern to perform an open stance tennis forehand for 30% of children tennis players. The purpose of the study was to examine the long-term effects of a gradual reduction in the shoe drop on the biomechanics of children tennis players performing open stance forehands. Thirty children tennis players participated in 2 laboratory biomechanical test sessions (intermediate: +4 months and final: +8 months) after an inclusion visit where they were randomly assigned to control (CON) or experimental (EXP) group...
August 30, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28837918/biomechanical-analysis-of-gait-waveform-data-exploring-differences-between-shod-and-barefoot-running-in-habitually-shod-runners
#16
Nicholas Tam, Danielle Prins, Nikhil V Divekar, Robert P Lamberts
The aim of this study was to utilise one-dimensional statistical parametric mapping to compare differences between biomechanical and electromyographical waveforms in runners when running in barefoot or shod conditions. Fifty habitually shod runners were assessed during overground running at their current 10-km race running speed. Electromyography, kinematics and ground reaction forces were collected during these running trials. Joint kinetics were calculated using inverse dynamics. One-dimensional statistical parametric mapping one sample t-test was conducted to assess differences over an entire gait cycle on the variables of interest when barefoot or shod (p<0...
August 18, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28836449/adjacent-joint-kinematics-after-ankle-arthrodesis-during-cadaveric-gait-simulation
#17
Daniel R Sturnick, Constantine A Demetracopoulos, Scott J Ellis, Robin M Queen, Jayme C B Kolstov, Jonathan T Deland, Josh R Baxter
BACKGROUND: Arthrodesis is an effective and reliable treatment for end-stage ankle arthritis; however, many patients develop ipsilateral adjacent joint arthritis following surgery. The mechanism that drives adjacent joint arthritis remains uncertain. Cadaveric simulation permits direct investigation of the effects of both arthrodesis and movement strategy on adjacent joints during simulated walking. The objective of this study was to identify the isolated effect of ankle arthrodesis on adjacent joint kinematics during simulated walking...
August 1, 2017: Foot & Ankle International
https://www.readbyqxmd.com/read/28828179/the-subtalar-joint-a-complex-mechanism
#18
Nicola Krähenbühl, Tamara Horn-Lang, Beat Hintermann, Markus Knupp
Subtalar joint anatomy is complex and can vary significantly between individuals.Movement is affected by several adjacent joints, ligaments and periarticular tendons.The subtalar joint has gained interest from foot and ankle surgeons in recent years, but its importance in hindfoot disorders is still under debate.The purpose of this article is to give a general overview of the anatomy, biomechanics and radiographic assessment of the subtalar joint.The influence of the subtalar joint on the evolution of ankle joint osteoarthritis is additionally discussed...
July 2017: EFORT open reviews
https://www.readbyqxmd.com/read/28826653/pure-ankle-dislocation-a-systematic-review-of-the-literature-and-estimation-of-incidence
#19
REVIEW
Lachlan Wight, David Owen, Daniel Goldbloom, Markus Knupp
BACKGROUND: Ankle dislocation without fracture is rare. We used electronic hospital records to determine the incidence of pure ankle dislocation and performed a systematic review of the literature to investigate the occurrence, treatment and outcome of this injury to better inform treating clinicians. METHODS: A review of electronic medical records at a tertiary referral centre was conducted to estimate in incidence of pure ankle dislocation. Systematic review of the literature was undertaken according to PRISMA guidelines for the reporting of individual patient data...
August 12, 2017: Injury
https://www.readbyqxmd.com/read/28814102/minimally-invasive-plate-osteosynthesis-using-locking-plates-for-ao-43-type-fractures-lessons-learnt-from-a-prospective-study
#20
Rajeev Shukla, Nikhil Jain, Ravi Kant Jain, Shravan Patidar, Vivek Kiyawat
INTRODUCTION: Managing fractures of distal tibia is still a subject of debate for orthopaedic surgeons in terms of both, reduction and fixation. Subcutaneous location and soft tissue anatomy predisposes it to angular and rotational instability as well as other bony and soft tissue complexities. Minimally invasive plating offers many advantages over conventional open techniques. It causes minimal soft tissue dissection and surgical trauma to the bone. Minimally invasive plate osteosynthesis(MIPO) maintains biological configuration of distal tibia and fracture hematoma and also provides a construct, which is biomechanically more stable...
August 1, 2017: Foot & Ankle Specialist
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