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biomechanics, foot

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https://www.readbyqxmd.com/read/28926327/long-term-outcomes-of-the-calcaneo-stop-procedure-in-the-treatment-of-flexible-flatfoot-in-children-a-retrospective-study
#1
Francisca Pinho Costa, Gilberto Costa, Manuel Santos Carvalho, António Mendes Moura, Rui Pinto, João Torres
INTRODUCTION: Flexible flatfoot is common amongst children, although treatment is rarely indicated. The calcaneo-stop procedure has been reported to be effective in short-term studies. We aim to evaluate the long-term outcomes of the calcaneo-stop procedure in the treatment of flexible flatfoot in children. MATERIAL AND METHODS: Twenty-six calcaneo-stop procedures performed between 1995 and 2006 on 13 patients were evaluated clinically and using photopodoscopy, and the FAOS questionnaire was applied for both feet...
August 31, 2017: Acta Médica Portuguesa
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/28895759/validation-of-plantar-pressure-simulations-using-finite-and-discrete-element-modelling-in-healthy-and-diabetic-subjects
#4
W Aerts, A Scarton, F De Groote, A Guiotto, Z Sawacha, C Cobelli, J Vander Sloten, I Jonkers
Plantar pressure simulation driven by integrated 3D motion capture data, using both a finite element and a discrete element model, is compared for ten healthy and ten diabetic neuropathic subjects. The simulated peak pressure deviated on average between 16.7 and 34.2% from the measured peak pressure. The error in the position of the peak pressure was on average smaller than 4.2 cm. No method was more accurate than the other although statistical differences were found between them. Both techniques are thus complementary and useful tools to better understand the alteration of diabetic foot biomechanics during gait...
September 12, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28890257/effects-of-pdgf-bb-delivery-from-heparinized-collagen-sutures-on-the-healing-of-lacerated-chicken-flexor-tendon-in-vivo
#5
Mousa Younesi, Derrick M Knapik, Jameson Cumsky, Baris Ozgur Donmez, Ping He, Anowarul Islam, Greg Learn, Philip McClellan, Michael Bohl, Robert J Gillespie, Ozan Akkus
Flexor tendon lacerations are traditionally repaired by using non-absorbable monofilament sutures. Recent investigations have explored to improve the healing process by growth factor delivery from the sutures. However, it is difficult to conjugate growth factors to nylon or other synthetic sutures. This study explores the performance of a novel electrochemically aligned collagen suture in a flexor tendon repair model with and without platelet derived growth factor following complete tendon laceration in vivo...
September 7, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28889946/dynamic-balance-in-persons-with-multiple-sclerosis-who-have-a-falls-history-is-altered-compared-to-non-fallers-and-to-healthy-controls
#6
Alexander T Peebles, Adam P Bruetsch, Sharon G Lynch, Jessie M Huisinga
Around 60% of persons with multiple sclerosis (MS) experience falls, however the dynamic balance differences between those who fall and those who don't are not well understood. The purpose of this study is to identify distinct biomechanical features of dynamic balance during gait that are different between fallers with MS, non-fallers with MS, and healthy controls. 27 recurrent fallers with MS, 28 persons with MS with no falls history, and 27 healthy controls walked on a treadmill at their preferred speed for 3min...
September 1, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28885156/the-vspa-foot-a-quasi-passive-ankle-foot-prosthesis-with-continuously-variable-stiffness
#7
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/28880604/a-novel-technique-to-determine-foot-contribution-to-limb-length-discrepancy
#8
George Lane
Evaluation for limb-length discrepancy is an important part of the biomechanical work-up in the podiatric musculoskeletal exam. By understanding the foot's contribution to such a discrepancy, the podiatric clinician will have better insight regarding treatment strategy. This technique will provide the clinician with a simple method to gain such insight.
July 2017: Journal of the American Podiatric Medical Association
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
#9
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/28874067/sural-flap-use-for-the-treatment-of-wounds-with-underlying-osteomyelitis-graft-size-a-predictor-in-outcome-a-systematic-review
#10
Sham Persaud, Anthony Chesser, Ryan Pereira, Adrianne Ross
The sural flap procedure is a versatile technique that can be used to cover many types of defects about the lower extremity. The management of soft tissue defects of the lower extremity with underlying osteomyelitis is difficult. The goal for any of these patients is to create a biomechanically stable foot for weight-bearing purposes with no continued infection. Data were gathered using multiple databases from the years 2000 to 2016. Data were compiled looking at the number of subjects, age, comorbidities, number of complications, number of failures, and average flap size of complications/failures...
September 1, 2017: Foot & Ankle Specialist
https://www.readbyqxmd.com/read/28841670/a-biomechanical-analysis-of-the-roundhouse-kicking-technique-of-expert-practitioners-a-comparison-between-the-martial-arts-disciplines-of-muay-thai-karate-and-taekwondo
#11
Colin J Gavagan, Mark G L Sayers
The purpose of this study was first, to determine whether there were differences in the roundhouse kicking leg kinematics performed by highly skilled Muay Thai, Karate and Taekwondo practitioners (n = 8 per group). Next, analysis aimed to identify the kinematic determinants of effective roundhouse kicking performance. Three-dimensional (3D) lower limb kinematics were recorded using a nine camera infra-red motion capture system (500 Hz) during three maximal roundhouse kicks. Impact forces were recorded using a strain gauge (1000 Hz) attached to a kicking pad positioned at the height of each participant's mastoid process...
2017: PloS One
https://www.readbyqxmd.com/read/28840674/-case-report-comprehensive-treatment-of-forefoot-with-double-brachymetatarsia-in-one-surgical-stage
#12
I Caldiño-Lozada, O Gallegos-de la Torre, R Esperón-Hernández
Brachymetatarsia (shortening of the metatarsal) directly affects the transversal arch of the foot causing severe deformities, such as hallux valgus, divergent toes, overlapping toes, metatarsalgia, all of these alter the biomechanics of the foot and gait. Treatment consists of two main techniques, one-stage lengthening with bone graft or elongation through callotaxis with external fixator; there are variants of both techniques used to minimize the disadvantages of each. The objective of treatment must be to return the structural harmony to the forefoot, improving the biomechanics, resulting in a satisfactory outcome for the patients...
March 2017: Acta Ortopédica Mexicana
https://www.readbyqxmd.com/read/28840671/-treatment-for-charcot-arthropathy-five-year-follow-up
#13
I Caldiño-Lozada, D Rojas-Osorio, R Esperón-Hernández
INTRODUCTION: Charcot arthropathy is a deformity which alters foot biomechanics and generate bichemical reactions that affect articular joints and bone. The natural history shown us a prevalence on 1% and is classified by Eichenholtz and Simmons modification in four stages; Sanders describe its location in 5 specific areas. MATERIAL AND METHODS: Our goal was to evaluate the specific method of treatment depending in the different stages of the deformity according to the literature review and to our proposed algoritm...
March 2017: Acta Ortopédica Mexicana
https://www.readbyqxmd.com/read/28836449/adjacent-joint-kinematics-after-ankle-arthrodesis-during-cadaveric-gait-simulation
#14
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/28835868/anterior-cervical-discectomy-with-fusion-using-a-local-source-for-cancellous-autograft-a-biomechanical-analysis-of-vertebral-body-stability-in-an-osteopenic-bone-model
#15
Zakk Walterscheid, Conor O'Neill, Alex Ochs, Adrian D'Averso, Christopher Dew, Alyssa Huntington, Grace Ma, Caleb Behrend, Rafaella De Vita, Jonathan Carmouche
BACKGROUND: Anterior cervical discectomy with fusion is an effective treatment for patients having cervical radiculopathy and myelopathy. To reduce morbidity associated with autograft taken from the iliac crest without sacrificing high fusion rates, a novel technique that harvests bone from the vertebral body adjacent to the operative disc space has been proposed. The effects of square and round bone graft harvest techniques on the mechanical stability of the osteopenic donor vertebrae are unknown...
September 2017: Geriatric Orthopaedic Surgery & Rehabilitation
https://www.readbyqxmd.com/read/28828179/the-subtalar-joint-a-complex-mechanism
#16
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/28826743/foot-disorders-in-the-elderly-a-mini-review
#17
David Rodríguez-Sanz, Natalia Tovaruela-Carrión, Daniel López-López, Patricia Palomo-López, Carlos Romero-Morales, Emmanuel Navarro-Flores, César Calvo-Lobo
Ageing process is associated with changes to the aspect, biomechanics, structure and function of the foot, it may be related with a marked presence of foot conditions, pain, disability and other overall health problems that constitute a major public health concern. Also, the prevalence of epidemiologic research found an incidence of foot problems which is even higher as a consequence of increasing life expectation. Several studies have also suggested that such foot disorders currently affect between 71 and 87% of older patients and are a frequent cause of medical and foot care...
August 18, 2017: Disease-a-month: DM
https://www.readbyqxmd.com/read/28814050/segmental-contributions-to-sagittal-plane-whole-body-angular-momentum-when-using-powered-compared-to-passive-ankle-foot-prostheses-on-ramps
#18
Nathaniel T Pickle, Anne K Silverman, Jason M Wilken, Nicholas P Fey
Understanding the effects of an assistive device on dynamic balance is crucial, particularly for robotic leg prostheses. Analyses of dynamic balance commonly evaluate the range of whole-body angular momentum (H). However, the contributions of individual body segments to overall H throughout gait may yield futher insights, specifically for people with transtibial amputation using powered prostheses. We evaluated segment contributions to H using Statistical Parametric Mapping to assess the effects of prosthesis type (powered vs passive) and ramp angle on segmental coordination...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28814000/preliminary-study-of-a-robotic-foot-ankle-prosthesis-with-active-alignment
#19
Andrew K LaPre, Ryan D Wedge, Brian R Umberger, Frank C Sup
Robotic prosthetic foot-ankle prostheses typically aim to replace the lost joint with revolute joints aimed at replicating normal joint biomechanics. In this paper, a previously developed robotic ankle prosthesis with active alignment is evaluated. It uses a four-bar mechanism to inject positive power into the gait cycle while altering the kinematics of the ankle joint and pylon segment to reduce loading on the residual limb. In a single-subject biomechanics analysis, there was a 10% reduction in peak limb pressures and evidence of greater gait symmetry in ground reaction forces when active alignment was implemented compared to walking with the daily use prosthesis...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813971/feasibility-study-of-transtibial-amputee-walking-using-a-powered-prosthetic-foot
#20
Martin Grimmer, Matthew Holgate, Jeffrey Ward, Alexander Boehler, Andre Seyfarth
Passive prosthetic feet are not able to provide non-amputee kinematics and kinetics for the ankle joint. Persons with amputations show reduced interlimb symmetry, slower walking speeds, and increased walking effort. To improve ankle range of motion and push off, various powered prosthetic feet were introduced. This feasibility study analyzed if predefined motor reference trajectories can be used to achieve non-amputee ankle biomechanics during walking with the powered prosthetic foot, Walk-Run Ankle. Trajectories were calculated using the desired ankle angle and ankle moment based spring deflection at a given spring stiffness...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
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