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ankle biomechanics

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https://www.readbyqxmd.com/read/28339828/single-session-of-functional-electrical-stimulation-assisted-walking-produces-corticomotor-symmetry-changes-related-to-changes-in-poststroke-walking-mechanics
#1
Jacqueline A Palmer, HaoYuan Hsiao, Tamara Wright, Stuart A Binder-Macleod
Background: Recent research demonstrated that symmetry of corticomotor drive to paretic and nonparetic plantarflexor muscles are related to the biomechanical ankle moment strategy that individuals with chronic stroke used to achieve their greatest walking speeds. Rehabilitation strategies that promote corticomotor balance could potentially improve post-stroke walking mechanics and enhance functional ambulation. Objective: To 1) test the effectiveness of a single session of gait training using functional electrical stimulation (FES) to improve plantarflexor corticomotor symmetry and plantarflexion ankle moment symmetry and 2) determine if changes in corticomotor symmetry relate to changes in ankle moment symmetry within the session...
February 23, 2017: Physical Therapy
https://www.readbyqxmd.com/read/28338386/targeted-functional-movement-retraining-to-improve-pain-function-and-biomechanics-in-subjects-with-anterior-knee-pain-a-case-series
#2
Dominique C Leibbrandt, Quinette A Louw
CONTEXT: Anterior Knee pain (AKP) is a common condition, especially in a young active population. The clinical presentations of this condition vary considerably and therefore an individualized approach to treatment is needed. OBJECTIVE: The primary objective of this study was to assess the effect of a novel targeted biomechanical intervention on subjects with AKP. DESIGN: A case series was conducted on eight participants with AKP Setting: The study was conducted at the Tygerberg motion analysis laboratory and Tygerberg physiotherapy clinic in Cape Town, South Africa...
March 24, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28337434/influence-of-power-delivery-timing-on-the-energetics-and-biomechanics-of-humans-wearing-a-hip-exoskeleton
#3
Aaron J Young, Jessica Foss, Hannah Gannon, Daniel P Ferris
A broad goal in the field of powered lower limb exoskeletons is to reduce the metabolic cost of walking. Ankle exoskeletons have successfully achieved this goal by correctly timing a plantarflexor torque during late stance phase. Hip exoskeletons have the potential to assist with both flexion and extension during walking gait, but the optimal timing for maximally reducing metabolic cost is unknown. The focus of our study was to determine the best assistance timing for applying hip assistance through a pneumatic exoskeleton on human subjects...
2017: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/28330449/a-cross-sectional-study-of-the-effects-of-load-carriage-on-running-characteristics-and-tibial-mechanical-stress-implications-for-stress-fracture-injuries-in-women
#4
Chun Xu, Amy Silder, Ju Zhang, Jaques Reifman, Ginu Unnikrishnan
BACKGROUND: Load carriage is associated with musculoskeletal injuries, such as stress fractures, during military basic combat training. By investigating the influence of load carriage during exercises on the kinematics and kinetics of the body and on the biomechanical responses of bones, such as the tibia, we can quantify the role of load carriage on bone health. METHODS: We conducted a cross-sectional study using an integrated musculoskeletal-finite-element model to analyze how the amount of load carriage in women affected the kinematics and kinetics of the body, as well as the tibial mechanical stress during running...
March 23, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28325673/lower-limb-dynamics-and-clinical-outcomes-for-habitually-shod-runners-who-transition-to-barefoot-running
#5
Rami Hashish, Sachithra D Samarawickrame, Susan Sigward, Stanley P Azen, George J Salem
OBJECTIVES: Recent investigations have revealed lower vertical loading rates and knee energy absorption amongst experienced barefoot runners relative to those who rear-foot strike (RFS). Although this has led to an adoption of barefoot running amongst many recreational shoe runners, recent investigations indicate that the experienced barefoot pattern is not immediately realized. Therefore, the purpose this investigation was to quantify changes in lower-extremity dynamics and clinical outcomes measures for habitually shod runners who perform a transition to barefoot running...
December 10, 2016: Physical Therapy in Sport
https://www.readbyqxmd.com/read/28323803/patient-response-to-an-integrated-orthotic-and-rehabilitation-initiative-for-traumatic-injuries-the-prioriti-mtf-study
#6
Joseph R Hsu, Johnny G Owens, Jennifer DeSanto, John R Fergason, Kevin M Kuhn, Benjamin K Potter, Daniel J Stinner, Robert G Sheu, Sandra L Waggoner, Jason M Wilken, Yanjie Huang, Daniel O Scharfstein, Ellen J MacKenzie
Although limb salvage is now possible for many high-energy open fractures and crush injuries to the distal tibia, ankle, hindfoot, and midfoot, orthotic options are limited. The Intrepid Dynamic Exoskeletal Orthosis (IDEO) is a custom, energy-storing carbon fiber orthosis developed for trauma patients undergoing limb salvage. The IDEO differs from other orthoses in that it allows patients with ankle weakness to have more normal ankle biomechanics and increased ankle power. This article describes the design of a study to evaluate the effectiveness of the IDEO when delivered together with a high-intensity, sports medicine-based approach to rehabilitation...
April 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28321479/novel-anatomical-reconstruction-of-distal-tibiofibular-ligaments-restores-syndesmotic-biomechanics
#7
Jian Che, Chunbao Li, Zhipeng Gao, Wei Qi, Binping Ji, Yujie Liu, Ming Han Lincoln Liow
PURPOSE: To date, there is a paucity of literature on syndesmotic reconstruction techniques that restore both anatomic stability and physiologic syndesmotic biomechanics. In this cadaveric study, (1) a novel syndesmotic reconstruction surgical technique using autogenous peroneus brevis tendon was described and (2) the biomechanical properties of the reconstruction was investigated. METHODS: Ten fresh-frozen lower extremities were used in this study. Reconstruction of the anterior and posterior, as well as the interosseous tibiofibular ligaments was performed with a halved peroneus brevis tendon...
March 20, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28314214/gait-biomechanics-following-lower-extremity-trauma-amputation-vs-reconstruction
#8
Elizabeth Russell Esposito, Daniel J Stinner, John R Fergason, Jason M Wilken
BACKGROUND: Surgical advances have substantially improved outcomes for individuals sustaining traumatic lower extremity injury. Injuries once requiring lower limb amputation are now routinely managed with limb reconstruction surgery. However, comparisons of functional outcomes between the procedures are inconclusive. PURPOSE: To compare gait biomechanics after lower limb reconstruction and transtibial amputation. METHODS: Twenty-four individuals with unilateral lower limb reconstruction wearing a custom ankle-foot orthosis (Intrepid Dynamic Exoskeletal Orthosis), 24 with unilateral, transtibial amputation, and 24 able-bodied control subjects underwent gait analysis at a standardized Froude speed based on leg length...
February 21, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28306191/biomechanical-markers-and-theoretical-concepts-related-to-haemophilic-ankle-and-subtalar-joint-arthropathy-introducing-the-term-haemophilic-tarsal-pan-arthropathy
#9
REVIEW
S Lobet, A McCarthy, C Hermans, K Peerlinck, G A Matricali, F Staes, K Deschamps
BACKGROUND: Although regular factor replacement can reduce the incidence of joint bleeds and slow down the development of haemophilic arthropathy, the ankle joint remains particularly vulnerable even in children with haemophilia on primary or secondary prophylaxis and is now the primary joint affected. The heterogeneity in the pathoaetiology of haemophilic ankle arthropathy means that the functional consequences of early stage of ankle arthropathy are difficult to define as early morphological and structural changes can be observed in clinically asymptomatic ankles...
March 17, 2017: Haemophilia: the Official Journal of the World Federation of Hemophilia
https://www.readbyqxmd.com/read/28298464/the-achilles-tendon-is-mechanosensitive-in-older-adults-adaptations-following-14%C3%A2-weeks-versus-1-5%C3%A2-years-of-cyclic-strain-exercise
#10
Gaspar Epro, Andreas Mierau, Jonas Doerner, Julian A Luetkens, Lukas Scheef, Guido M Kukuk, Henning Boecker, Constantinos N Maganaris, Gert-Peter Brüggemann, Kiros Karamanidis
The aging musculoskeletal system experiences a general decline in structure and function, characterized by a reduced adaptability to environmental stress. We investigated whether the older human Achilles tendon (AT) demonstrates mechanosensitivity (via biomechanical and morphological adaptations) in response to long-term mechanical loading. Thirty-four female adults (60-75 years) were allocated to either a medium-term (14 weeks; N=21) high AT strain cyclic loading exercise intervention or a control group (N=13), with 12 participants continuing with the intervention for 1...
March 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28298142/effect-of-complete-syndesmotic-disruption-and-deltoid-injuries-and-different-reduction-methods-on-ankle-joint-contact-mechanics
#11
Jeremy LaMothe, Josh R Baxter, Susannah Gilbert, Conor I Murphy, Sydney C Karnovsky, Mark C Drakos
BACKGROUND: Syndesmotic injuries can be associated with poor patient outcomes and posttraumatic ankle arthritis, particularly in the case of malreduction. However, ankle joint contact mechanics following a syndesmotic injury and reduction remains poorly understood. The purpose of this study was to characterize the effects of a syndesmotic injury and reduction techniques on ankle joint contact mechanics in a biomechanical model. METHODS: Ten cadaveric whole lower leg specimens with undisturbed proximal tibiofibular joints were prepared and tested in this study...
March 1, 2017: Foot & Ankle International
https://www.readbyqxmd.com/read/28298066/effect-of-fatigue-protocols-on-lower-limb-neuromuscular-function-and-implications-for-anterior-cruciate-ligament-injury-prevention-training
#12
Sue D Barber-Westin, Frank R Noyes
BACKGROUND: Approximately two-thirds of anterior cruciate ligament (ACL) tears are sustained during noncontact situations when an athlete is cutting, pivoting, decelerating, or landing from a jump. Some investigators have postulated that fatigue may result in deleterious alterations in lower limb biomechanics during these activities that could increase the risk of noncontact ACL injuries. However, prior studies have noted a wide variation in fatigue protocols, athletic tasks studied, and effects of fatigue on lower limb kinetics and kinematics...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28283180/does-intra-articular-load-distribution-change-after-lateral-malleolar-fractures-an-in-vivo-study-comparing-operative-and-non-operative-treatment
#13
Christian Deml, Martin Eichinger, Wouter F van Leeuwen, Stefanie Erhart, Simon A Euler, Alexander Brunner
PURPOSE: The impact of isolated malleolar fractures on the intra-articular load distribution within the ankle joint has been studied in several biomechanical cadaver studies during the last decades. Recently, computed tomography osteoabsorptiometry (CT-OAM) has been proposed as a valuable tool to assess intra-articular joint load distribution in vivo. The purpose of this retrospective matched pair analysis was to apply CT-OAM to evaluate in vivo changes of talar load distribution after lateral malleolar fractures in patients treated with open anatomic reduction and internal fixation (ORIF) compared to patients treated non-operatively...
March 6, 2017: Injury
https://www.readbyqxmd.com/read/28276912/soreness-related-changes-in-three-dimensional-running-biomechanics-following-eccentric-knee-extensor-exercise
#14
Max R Paquette, Shelby A Peel, Brian K Schilling, Dan A Melcher, Richard J Bloomer
Runners often experience delayed onset muscle soreness (DOMS), especially of the knee extensors, following prolonged running. Sagittal knee joint biomechanics are altered in the presence of knee extensor DOMS but it is unclear how muscle soreness affects lower limb biomechanics in other planes of motion. The purpose of this study was to assess the effects of knee extensor DOMS on three-dimensional (3D) lower limb biomechanics during running. Thirty-three healthy men (25.8 ± 6.8 years; 84.1 ± 9.2 kg; 1...
February 22, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28276650/comparison-of-arthrodesis-and-non-fusion-to-treat-lisfranc-injuries
#15
Yu-Sen Qiao, Jun-Kun Li, Hao Shen, Hai-Yan Bao, Ming Jiang, Yan Liu, Wasim Kapadia, Hong-Tao Zhang, Hui-Lin Yang
OBJECTIVE: "Lisfranc joint injury" is comprised of a tarsometatarsal joint-complex injury. The Lisfranc complex injury is always a challenge for orthopedists, and the optimum treatment is still up for debate. Anatomic reduction and stable internal fixation prove to have no satisfactory outcomes. This research aims to compare the clinical curative effects, complications and radiographic features of arthrodesis and non-fusion of the Lisfranc joint in the follow-up of the patients who suffered Lisfranc injuries...
March 9, 2017: Orthopaedic Surgery
https://www.readbyqxmd.com/read/28257675/equinus-and-lengthening-techniques
#16
REVIEW
Patrick A DeHeer
Equinus is linked to most lower extremity biomechanically related disorders. Defining equinus as ankle joint dorsiflexion less than 5° of dorsiflexion with the knee extended is the basis for evaluation and management of the deformity. Consistent evaluation methodology using a goniometer with the subtalar joint in neutral position and midtarsal joint supinated while dorsiflexing the ankle with knee extended provides a consistent clinical examination. For equinus deformity with an associated disorder, comprehensive treatment mandates treatment of the equinus deformity...
April 2017: Clinics in Podiatric Medicine and Surgery
https://www.readbyqxmd.com/read/28250804/predictive-behavior-of-a-computational-foot-ankle-model-through-artificial-neural-networks
#17
Ruchi D Chande, Rosalyn Hobson Hargraves, Norma Ortiz-Robinson, Jennifer S Wayne
Computational models are useful tools to study the biomechanics of human joints. Their predictive performance is heavily dependent on bony anatomy and soft tissue properties. Imaging data provides anatomical requirements while approximate tissue properties are implemented from literature data, when available. We sought to improve the predictive capability of a computational foot/ankle model by optimizing its ligament stiffness inputs using feedforward and radial basis function neural networks. While the former demonstrated better performance than the latter per mean square error, both networks provided reasonable stiffness predictions for implementation into the computational model...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28246134/precision-orthotics-optimising-ankle-foot-orthoses-to-improve-gait-in-patients-with-neuromuscular-diseases-protocol-of-the-proof-afo-study-a-prospective-intervention-study
#18
Niels F J Waterval, Frans Nollet, Jaap Harlaar, Merel-Anne Brehm
INTRODUCTION: In patients with neuromuscular disorders and subsequent calf muscle weakness, metabolic walking energy cost (EC) is nearly always increased, which may restrict walking activity in daily life. To reduce walking EC, a spring-like ankle-foot-orthosis (AFO) can be prescribed. However, the reduction in EC that can be obtained from these AFOs is stiffness dependent, and it is unknown which AFO stiffness would optimally support calf muscle weakness. The PROOF-AFO study aims to determine the effectiveness of stiffness-optimised AFOs on reducing walking EC, and improving gait biomechanics and walking speed in patients with calf muscle weakness, compared to standard, non-optimised AFOs...
February 28, 2017: BMJ Open
https://www.readbyqxmd.com/read/28242569/uphill-walking-biomechanical-demand-on-the-lower-extremities-of-obese-adolescents
#19
Gerda Strutzenberger, Nathalie Alexander, Dominik Bamboschek, Elisabeth Claas, Helmut Langhof, Hermann Schwameder
The number of obesity prevalence in adolescents is still increasing. Obesity treatment programs typically include physical activity with walking being recommended as appropriate activity, but limited information exists on the demand uphill walking places on the joint loading and power of obese adolescents. Therefore, the purpose of this study was to investigate the effect of different inclinations on step characteristics, sagittal and frontal joint angles, joint moments and joint power of obese adolescents in comparison to their normal-weight peers...
February 20, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28240709/changes-in-vertical-and-joint-stiffness-in-runners-with-advancing-age
#20
Douglas W Powell, D S Blaise Williams
BACKGROUND: Age-related changes in the neuromuscular system underlie reduced performance and injury, but may be mitigated through regular physical activity. It was hypothesized that older (OLD) compared to young (YOUNG) adults would exhibit greater vertical and joint stiffness when running at 3.35 m/s. METHODS: Nine YOUNG and ten OLD runners performed over ground running trials while three-dimensional biomechanics were recorded. Ankle and knee joint angles, moments and stiffness values were compared between YOUNG & OLD...
February 23, 2017: Journal of Strength and Conditioning Research
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