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ankle biomechanics

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https://www.readbyqxmd.com/read/28220401/numerical-model-for-healthy-and-injured-ankle-ligaments
#1
Antonella Forestiero, Emanuele Luigi Carniel, Chiara Giulia Fontanella, Arturo Nicola Natali
The aim of this work is to provide a computational tool for the investigation of ankle mechanics under different loading conditions. The attention is focused on the biomechanical role of ankle ligaments that are fundamental for joints stability. A finite element model of the human foot is developed starting from Computed Tomography and Magnetic Resonance Imaging, using particular attention to the definition of ankle ligaments. A refined fiber-reinforced visco-hyperelastic constitutive model is assumed to characterize the mechanical response of ligaments...
February 20, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28209597/athletic-groin-pain-part-2-a-prospective-cohort-study-on-the-biomechanical-evaluation-of-change-of-direction-identifies-three-clusters-of-movement-patterns
#2
A Franklyn-Miller, C Richter, E King, S Gore, K Moran, S Strike, E C Falvey
BACKGROUND: Athletic groin pain (AGP) is prevalent in sports involving repeated accelerations, decelerations, kicking and change-of-direction movements. Clinical and radiological examinations lack the ability to assess pathomechanics of AGP, but three-dimensional biomechanical movement analysis may be an important innovation. AIM: The primary aim was to describe and analyse movements used by patients with AGP during a maximum effort change-of-direction task. The secondary aim was to determine if specific anatomical diagnoses were related to a distinct movement strategy...
March 2017: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/28209345/multiobjective-optimization-of-cartilage-stress-for-non-invasive-patient-specific-recommendations-of-high-tibial-osteotomy-correction-angle-a-novel-method-to-investigate-alignment-correction
#3
Keke Zheng, Corey J Scholes, Junning Chen, David Parker, Qing Li
Medial opening wedge high tibial osteotomy (MOWHTO) is a surgical procedure to treat knee osteoarthritis associated with varus deformity. However, the ideal final alignment of the Hip-Knee-Ankle (HKA) angle in the frontal plane, that maximizes procedural success and post-operative knee function, remains controversial. Therefore, the purpose of this study was to introduce a subject-specific modeling procedure in determining the biomechanical effects of MOWHTO alignment on tibiofemoral cartilage stress distribution...
February 13, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28183211/3d-optical-investigation-of-2-nail-systems-used-in-tibiotalocalcaneal-arthrodesis
#4
Julia Evers, Martin Lakemeier, Dirk Wähnert, Martin Schulze, Martinus Richter, Michael J Raschke, Sabine Ochman
BACKGROUND: Although retrograde intramedullary nails for tibiotalocalcaneal arthrodesis (TTCA) are an established fixation method, few studies have evaluated the stability of the available nail systems. The purpose of this study was to compare biomechanically the primary stability of 2 nail-systems, A3 (Small Bone Innovations) and HAN (Synthes), in human cadavers and analyze the exact point of instability in TTCA by means of optical measurement. METHODS: In 6 pairs of lower legs (n = 12) of fresh-frozen human cadavers with osteoporotic bone structure, bone mineral density (BMD) was determined...
February 1, 2017: Foot & Ankle International
https://www.readbyqxmd.com/read/28174604/challenging-the-foundations-of-the-clinical-model-of-foot-function-further-evidence-that-the-root-model-assessments-fail-to-appropriately-classify-foot-function
#5
Hannah L Jarvis, Christopher J Nester, Peter D Bowden, Richard K Jones
BACKGROUND: The Root model of normal and abnormal foot function remains the basis for clinical foot orthotic practice globally. Our aim was to investigate the relationship between foot deformities and kinematic compensations that are the foundations of the model. METHODS: A convenience sample of 140 were screened and 100 symptom free participants aged 18-45 years were invited to participate. The static biomechanical assessment described by the Root model was used to identify five foot deformities...
2017: Journal of Foot and Ankle Research
https://www.readbyqxmd.com/read/28171797/efficacy-of-repair-techniques-of-the-achilles-tendon-a-meta-analysis-of-human-cadaveric-biomechanical-studies
#6
REVIEW
Kaissar Yammine, Chahine Assi
PURPOSE: Achilles injuries are very common, mainly among young athletes. When indicated, the surgical treatment aims for strong repairs that can resist distraction and consequently ruptures. The majority of the published clinical meta-analyses reported comparisons between broad treatment modalities such as conservative treatment, open, and minimally invasive surgery. METHODS: A meta-analysis has been conducted to assess further clinical and biomechanical variables on human cadavers related to the efficacy of Achilles repair...
January 28, 2017: Foot
https://www.readbyqxmd.com/read/28167058/posterior-malleolar-fractures-changing-concepts-and-recent-developments
#7
REVIEW
Jan Bartoníček, Stefan Rammelt, Michal Tuček
Injuries to the posterior malleolus are of prognostic relevance in ankle fracture-dislocations. The three-dimensional outline of the fragments as reflected by computed tomography classification, involvement of the fibular notch, and the presence of intercalary fragments seem to be of greater therapeutic relevance than the size of the fragment and amount of the articular surface involved. Operative treatment aims at reconstruction of the posterior tibial plafond, the fibular notch, and the integrity of the posterior inferior tibiofibular syndesmosis...
March 2017: Foot and Ankle Clinics
https://www.readbyqxmd.com/read/28155591/impact-of-an-implanted-neuroprosthesis-on-community-ambulation-in-incomplete-sci
#8
Lisa M Lombardo, Rudolf Kobetic, Gilles Pinault, Kevin M Foglyano, Stephanie N Bailey, Stephen Selkirk, Ronald J Triolo
OBJECTIVE: Test the effect of a multi-joint control with implanted electrical stimulation on walking after spinal cord injury (SCI). DESIGN: Single subject research design with repeated measures Setting: Hospital-based biomechanics laboratory and user assessment of community use. PARTICIPANTS: Female with C6 AIS C SCI 30 years post injury. INTERVENTIONS: Lower extremity muscle activation with an implanted pulse generator and gait training...
February 3, 2017: Journal of Spinal Cord Medicine
https://www.readbyqxmd.com/read/28151702/the-athletic-shoe-in-football
#9
James Jastifer, Richard Kent, Jeff Crandall, Chris Sherwood, David Lessley, Kirk A McCullough, Michael J Coughlin, Robert B Anderson
BACKGROUND: Foot and ankle injuries are common in sports, particularly in cleated athletes. Traditionally, the athletic shoe has not been regarded as a piece of protective equipment but rather as a part of the uniform, with a primary focus on performance and subjective feedback measures of comfort. Changes in turf and shoe design have poorly understood implications on the health and safety of players. EVIDENCE ACQUISITION: A literature search of the MEDLINE and PubMed databases was conducted...
March 2017: Sports Health
https://www.readbyqxmd.com/read/28149400/the-effect-of-different-decline-angles-on-the-biomechanics-of-double-limb-squats-and-the-implications-to-clinical-and-training-practice
#10
Jim Richards, James Selfe, Jonathan Sinclair, Karen May, Gavin Thomas
Bilateral decline squatting has been well documented as a rehabilitation exercise, however, little information exists on the optimum angle of decline. The aim of this study was to determine the ankle and knee angle, moments, the patellofemoral joint load, patellar tendon load and associated muscle activity while performing a double limb squat at different decline angles and the implications to rehabilitation. Eighteen healthy subjects performed double limb squats at 6 angles of declination: 0, 5, 10, 15, 20 and 25 degrees...
September 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28145739/achilles-tendon-loading-during-heel-raising-and-lowering-exercises
#11
Andrew Revak, Keith Diers, Thomas W Kernozek, Naghmeh Gheidi, Christina Olbrantz
CONTEXT:  Achilles tendinopathies are common injuries during sport participation, although men are more prone to Achilles tendon injuries than women. Heel-raising and -lowering exercises are typically suggested for Achilles tendon rehabilitation. OBJECTIVE:  To compare the estimated Achilles tendon loading variables and the ankle range of motion (ROM) using a musculoskeletal model during commonly performed heel-raising and -lowering exercises. DESIGN:  Controlled laboratory study...
February 1, 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/28135662/trunk-and-lower-limb-biomechanics-during-stair-climbing-in-people-with-and-without-symptomatic-femoroacetabular-impingement
#12
Connor A Hammond, Gillian L Hatfield, Michael K Gilbart, S Jayne Garland, Michael A Hunt
BACKGROUND: Femoroacetabular impingement is a pathomechanical hip condition leading to pain and impaired physical function. It has been shown that those with femoroacetabular impingement exhibit altered gait characteristics during level walking and stair climbing, and decreased muscle force production during isometric muscle contractions. However, no studies to-date have looked at trunk kinematics or muscle activation during dynamic movements such as stair climbing in this patient population...
February 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28129269/the-effect-of-varying-tension-of-a-suture-button-construct-in-fixation-of-the-tibiofibular-syndesmosis-evaluation-using-stress-computed-tomography
#13
John Morellato, Hakim Louati, Andrew Bodrogi, Andrew Stewart, Steven Papp, Allan Liew, Wade Gofton
BACKGROUND/PURPOSE: There have been no studies assessing the optimal biomechanical tension of suture button constructs. The purpose of this study was to assess optimal tensioning of suture button fixation and its ability to maintain reduction under loaded conditions using a stress computed tomography (CT) model. METHODS: Ten cadaveric lower limbs disarticulated at the knee were used. The limbs were placed in a modified ankle load frame that allowed for the application of sustained torsional axial or combined torsional/axial loads...
February 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28126335/two-biomechanical-strategies-for-locomotor-adaptation-to-split-belt-treadmill-walking-in-subjects-with-and-without-transtibial-amputation
#14
Brian P Selgrade, Megan E Toney, Young-Hui Chang
Locomotor adaptation is commonly studied using split-belt treadmill walking, in which each foot is placed on a belt moving at a different speed. As subjects adapt to split-belt walking, they reduce metabolic power, but the biomechanical mechanism behind this improved efficiency is unknown. Analyzing mechanical work performed by the legs and joints during split-belt adaptation could reveal this mechanism. Because ankle work in the step-to-step transition is more efficient than hip work, we hypothesized that control subjects would reduce hip work on the fast belt and increase ankle work during the step-to-step transition as they adapted...
January 14, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28120032/-tendinopathies-of-the-foot-and-ankle-evidence-for-the-origin-diagnostics-and-therapy
#15
Ralph Gaulke, Christian Krettek
Tendinopathies of the foot and ankle result in substantial impairment of the mobility of patients and have a high clinical significance. Knowledge of the origin of these diseases has been accumulated over decades from the multitude of intrinsic and extrinsic triggering factors based on biomechanical considerations with an evidence-based medicine (EBM) level 5. A high correlation between tendinopathy and hypervascularization of the Achilles tendon was found in a double-blind randomized prospective study using Doppler ultrasound (EBM level 1) but these results were not reproducible; therefore, the importance of these findings is unclear...
January 24, 2017: Der Unfallchirurg
https://www.readbyqxmd.com/read/28113346/control-and-evaluation-of-a-powered-transfemoral-prosthesis-for-stair-ascent
#16
Elissa D Ledoux, Michael Goldfarb
This paper assesses the metabolic effort exerted by three transfemoral amputees when using a powered knee and ankle prosthesis for stair ascent, relative to ascending stairs with passive knee and ankle prostheses. The paper describes a controller that provides step-over stair ascent behavior reflective of healthy stair ascent biomechanics, and describes its implementation in a powered prosthesis prototype. Stair ascent experiments were performed with three unilateral transfemoral amputee subjects, comparing the oxygen consumption required to ascend stairs using the powered prosthesis (with a step-over gait), relative to using their daily-use energetically passive prostheses (with a step-to gait)...
January 20, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28110795/association-between-knee-osteoarthritis-and-functional-changes-in%C3%A2-ankle-joint-and-achilles-tendon
#17
Avi Elbaz, Irina Magram-Flohr, Ganit Segal, Amit Mor, Ronen Debi, Leonid Kalichman
Increasing evidence has shown that biomechanical forces often drive the progression of knee osteoarthritis (OA). Attention should be given to the changes in adjacent joints and their relation to knee OA. The purpose of the present study was to examine the changes in Achilles tendon thickness of individuals with knee OA and to evaluate the correlation between Achilles tendon thickness and knee OA severity in a case-control prospective observational study. A total of 93 participants with no previous ankle injuries were recruited...
January 16, 2017: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/28105122/analysis-of-3-dimensional-finite-element-after-reconstruction-of-impaired-ankle-deltoid-ligament
#18
Yunhan Ji, Xianzhong Tang, Yifan Li, Wei Xu, Wenjun Qiu
We compared four repair techniques for impaired ankle ligament deltoideum, namely Wiltberger, Deland, Kitaoka and Hintermann using a 3-dimensional finite element. We built an ankle ligament deltoideum model, including six pieces of bone structures, gristles and main ligaments around the ankle. After testing the model, we built an impaired ligament deltoideum model plus four reconstruction models. Subsequently, different levels of force on ankles with different flexion were imposed and ankle biomechanics were compared...
December 2016: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28104260/robot-guided-ankle-sensorimotor-rehabilitation-of-patients-with-multiple-sclerosis
#19
Yunju Lee, Kai Chen, Yupeng Ren, Jongsang Son, Bruce A Cohen, James A Sliwa, Li-Qun Zhang
BACKGROUND: People with multiple sclerosis (MS) often develop symptoms including muscle weakness, spasticity, imbalance, and sensory loss in the lower limbs, especially at the ankle, which result in impaired balance and locomotion and increased risk of falls. Rehabilitation strategies that improve ankle function may improve mobility and safety of ambulation in patients with MS. This pilot study investigated effectiveness of a robot-guided ankle passive-active movement training in reducing motor and sensory impairments and improving balance and gait functions...
January 2017: Multiple Sclerosis and related Disorders
https://www.readbyqxmd.com/read/28103870/osteochondral-autograft-transplantation-with-biplanar-distal-tibial-osteotomy-for-patients-with-concomitant-large-osteochondral-lesion-of-the-talus-and-varus-ankle-malalignment
#20
Xingchen Li, Yuan Zhu, Yang Xu, Bibo Wang, Jinhao Liu, Xiangyang Xu
BACKGROUND: Osteochondral lesions of the talus (OLTs) are amongst the most common foot and ankle disorders. Varus ankle malalignment causes stress concentration on medial side of the joint, resulting in OLTs and osteoarthritis. For large symptomatic OLTs (>10 mm), Osteochondral autograft transplantation is usually recommended. This article highlights biplanar distal tibial osteotomy as an approach and management for patients with concomitant large OLTs and varus ankle malalignment...
January 19, 2017: BMC Musculoskeletal Disorders
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