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https://www.readbyqxmd.com/read/27913354/a-novel-elastic-force-field-to-influence-mediolateral-foot-placement-during-walking
#1
Elizabeth Nyberg, Jordan Broadway, Christian Finetto, Jesse Dean
Bipedal gait can be stabilized through mechanically-appropriate mediolateral foot placement, although this strategy is disrupted in a subset of neurologically injured individuals with balance deficits. The goal of the present work was to develop a device to influence mediolateral foot placement during treadmill walking. We created a novel force-field using a combination of passive elasticity and active control; wires in series with extension springs run parallel to the treadmill belts and can be rapidly repositioned to exert mediolateral forces on the legs of users...
December 1, 2016: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/27905365/-gait-disorders-and-postural-instability-in-patients-with-an-essential-tremor
#2
S V Vasichkin, O S Levin
AIM: To study gait disorders and postural instability in patients with essential tremor (ET). MATERIAL AND METHODS: Forty patients with ET, aged from 29 to 82 years, (mean 64.2±13.0) were examined. Tandem walk, tremor, stability and stabilometry were studied. RESULTS AND CONCLUSION: A half of the patients had gait disorders and postural instability. Though these disorders were mild to moderate, they caused significant subjective discomfort and influenced quality of life...
2016: Zhurnal Nevrologii i Psikhiatrii Imeni S.S. Korsakova
https://www.readbyqxmd.com/read/27903258/catwalk-gait-analysis-in-a-rat-model-of-multiple-sclerosis
#3
Sabine Herold, Prateek Kumar, Klaus Jung, Irina Graf, Henrike Menkhoff, Xenia Schulz, Mathias Bähr, Katharina Hein
BACKGROUND: Myelin oligodendrocyte glycoprotein (MOG)-induced experimental autoimmune encephalomyelitis (EAE) is a widely used animal model for multiple sclerosis. The characteristic feature of the MOG-EAE model in Brown Norway rats is consistent involvement of the spinal cord resulting in limb paresis. The aim of the study was to investigate whether early subclinical gait abnormalities are present in this animal model and can be detected by CatWalk XT, a fully automated gait analysis system...
November 30, 2016: BMC Neuroscience
https://www.readbyqxmd.com/read/27890581/total-hip-arthroplasty-using-a-cementless-dual-mobility-cup-provides-increased-stability-and-favorable-gait-parameters-at-five-years-follow-up
#4
A Acker, J-F Fischer, K Aminian, E Lécureux, B M Jolles
BACKGROUND: Rates of dislocation following primary total hip arthroplasty (THA) vary from 0.5 to 10%. Dual-mobility cups in THA demonstrate increased stability. Clinical outcomes following THA with dual-mobility cups have been reported, but gait has not been assessed. Therefore we performed a retrospective case control study to answer: (1) is gait better in patients following THA with a dual-mobility cup than in frail, elderly patients of the same age? (2) Are clinical outcomes better in patients following THA with a dual-mobility cup than in frail, elderly patients? (3) What is the dislocation rate following THA with a dual-mobility cup? HYPOTHESIS: We hypothesized that patients who underwent THA with a dual-mobility cup have a better gait compared to frail, elderly patients of the same age...
November 24, 2016: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/27889188/dynamic-margin-of-stability-during-gait-is-altered-in-persons-with-multiple-sclerosis
#5
Alexander T Peebles, Alyson Reinholdt, Adam P Bruetsch, Sharon G Lynch, Jessie M Huisinga
Persons with multiple sclerosis (PwMS) have high fall risk due to altered balance. To measure dynamic balance during walking, margin of stability (MoS) examines how the extrapolated center of mass moves relative to the base of support. This study investigates how MoS is affected in PwMS during walking at preferred, slow, and fast speeds, as well as the relationship between MoS and the Expanded Disability Severity Score (EDSS), fall history, and self-report balance confidence questionnaire. MoS was evaluated in PwMS without clinical gait impairment (MS1; n=20), PwMS with clinical gait impairment (MS2; n=20), and age-matched healthy controls (HC) (n=20), in the anterior/posterior (AP) and medial/lateral (ML) direction at heel strike and midstance...
November 10, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27878442/clinical-and-neurophysiological-risk-factors-for-falls-in-patients-with-bilateral-vestibulopathy
#6
Roman Schniepp, Cornelia Schlick, Fabian Schenkel, Cauchy Pradhan, Klaus Jahn, Thomas Brandt, Max Wuehr
Patients with bilateral vestibular failure (BVF) exhibit imbalance when standing and walking that is linked to a higher fall risk. The purpose of this study was to identify risk factors for falls in BVF. We therefore systematically investigated the interrelationship of clinical and demographic characteristics, gait impairments, and the fall frequency of these patients. Clinical and demographic characteristics as well as quantitative measures of gait performance on a pressure-sensitive gait carpet were collected from 55 patients with different etiologies of BVF...
November 22, 2016: Journal of Neurology
https://www.readbyqxmd.com/read/27853414/stability-and-harmony-of-gait-in-patients-with-subacute-stroke
#7
Marco Iosa, Fabiano Bini, Franco Marinozzi, Augusto Fusco, Giovanni Morone, Giacomo Koch, Alex Martino Cinnera, Sonia Bonnì, Stefano Paolucci
Stroke affects many gait features, such as gait stability, symmetry, and harmony. However, it is still unclear which of these features are directly altered by primary damage, and which are affected by the reduced walking speed. The aim of this study was to analyze the above gait features in patients with subacute stroke with respect to the values observed in age- and speed-matched healthy subjects. A wearable triaxial accelerometer and an optoelectronic device were used for assessing the upright gait stability, symmetry of trunk movements, and harmonic structure of gait phases by means of the root-mean-square (RMS) acceleration of the trunk, harmonic ratio (HR), and gait ratios (GRs), respectively...
2016: Journal of Medical and Biological Engineering
https://www.readbyqxmd.com/read/27846435/muscle-activation-patterns-of-the-lumbo-pelvic-hip-complex-during-walking-gait-before-and-after-exercise
#8
Mihyang Chang, Lindsay V Slater, Revay O Corbett, Joseph M Hart, Jay Hertel
The lumbo-pelvic-hip core complex consists of musculoskeletal structures that stabilize the spine and pelvis, however fatigue may affect muscle recruitment, active muscle stiffness and trunk kinematics, compromising trunk stability. The purpose of this study was to compare trunk muscle activation patterns, and trunk and lower extremity kinematics during walking gait before and after exercise. Surface electrodes were placed over the rectus abdominis, external oblique, erector spinae, gluteus medius, vastus lateralis, and vastus medialis of twenty-five healthy inidviduals...
November 9, 2016: Gait & Posture
https://www.readbyqxmd.com/read/27826404/the-activation-pattern-of-trunk-and-lower-limb-muscles-in-an-electromyographic-assessment-comparison-between-ground-and-treadmill-walking
#9
Reza Mazaheri, Mohammad Ali Sanjari, Gelareh Radmehr, Farzin Halabchi, Hooman Angoorani
BACKGROUND: Due to biomechanical differences, various patterns of muscle contraction are expected to occur while walking over ground versus when walking on a treadmill. OBJECTIVES: This study aimed to compare amplitude and duration of activation of selected trunk and lower extremity muscles during over-ground and treadmill walking. MATERIALS AND METHODS: Through a simple sampling method, 19 sedentary healthy men within the age range of 20 - 40 were selected...
September 2016: Asian Journal of Sports Medicine
https://www.readbyqxmd.com/read/27817976/return-to-sport-activity-after-anterior-cruciate-ligament-reconstruction-in-skeletally-immature-athletes-with-manual-drilling-original-all-inside-reconstruction-at-8-years-follow-up
#10
Giacomo Placella, Matteo Bartoli, Marco Peruzzi, Andrea Speziali, Valerio Pace, Giuliano Cerulli
OBJECTIVE: Anterior cruciate ligament (ACL) tears are common injuries in adolescent athletes, especially in those who bear high stress on their knees due to shearing forces. The goal of the surgical procedures in skeletally immature patients is to restore joint stability avoiding the adverse effects on the growth process. The aim of this study was to verify the return of the skeletally immature professional athletes to sports in the long-term, following ACL reconstruction with the original all-inside technique and with manual drilling...
November 3, 2016: Acta Orthopaedica et Traumatologica Turcica
https://www.readbyqxmd.com/read/27816389/biomechanical-optimization-of-the-angle-and-position-for-surgical-implantation-of-a-straight-short-stem-hip-implant
#11
Gillian E Cook, Saeid Samiezadeh, Zachary Morison, Mina S R Aziz, Habiba Bougherara, Radovan Zdero, Emil H Schemitsch
Conservative hip implants preserve healthy bone for revision surgeries and improve physiological loading; however, they have little supporting biomechanical data with respect to their 3D orientation during implantation. This study endeavored to determine the optimal 3D orientation of a straight short stem hip implant within the proximal femur that would yield a stress distribution most similar to an intact femur. Synthetic femurs were implanted with a stem in one of seven maximum angles or positions and axially loaded, with resultant strain values used to validate a finite element model...
November 2, 2016: Medical Engineering & Physics
https://www.readbyqxmd.com/read/27816258/anti-yo-positive-paraneoplastic-cerebellar-degeneration-in-the-setting-of-cholangiocarcinoma
#12
Aubree Bruhnding, Derek Notch, Albertine Beard
Paraneoplastic neurological syndromes are a rare complication of malignancy. Subacute cerebellar ataxia, or paraneoplastic cerebellar degeneration, usually presents in women with a subcate onset of gait instability, followed by progressive limb and trunk ataxia, dysarthria, diplopia, and dysphagia that occurs in the setting of, or precedes the diagnosis of, a gynecologic or breast malignancy and clinically stabilizes within six months. The most common autoantibody associated with PCD is purkinje cell cytoplasmic antibody type 1, also known as anti-Yo...
November 2, 2016: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/27800202/leg-lengthening-as-a-means-of-improving-ambulation-following-an-internal-hemipelvectomy
#13
Wakyo Sato, Hiroshi Okazaki, Takahiro Goto
Reconstructive surgery following an internal hemipelvectomy for a malignant pelvic tumor is difficult due to the structural complexity of the pelvis and the massive extension of the tumor. While high complication rates have been encountered in various types of reconstructive surgery, resection without reconstruction reportedly involved fewer complications. However, this method often results in limb shortening with resultant instability during walking. We reported herein leg lengthening performed to correct lower limb shortening after an internal hemipelvectomy, which improved ambulatory stability and overall QOL...
2016: Case Reports in Orthopedics
https://www.readbyqxmd.com/read/27790243/the-effect-of-spinal-tap-test-on-different-sensory-modalities-of-postural-stability-in-idiopathic-normal-pressure-hydrocephalus
#14
Katrin Abram, Silvia Bohne, Peter Bublak, Panagiota Karvouniari, Carsten M Klingner, Otto W Witte, Orlando Guntinas-Lichius, Hubertus Axer
BACKGROUND/AIMS: Postural instability in patients with normal pressure hydrocephalus (NPH) is a most crucial symptom leading to falls with secondary complications. The aim of the current study was to evaluate the therapeutic effect of spinal tap on postural stability in these patients. METHODS: Seventeen patients with clinical symptoms of NPH were examined using gait scale, computerized dynamic posturography (CDP), and neuropsychological assessment. Examinations were done before and after spinal tap test...
September 2016: Dementia and Geriatric Cognitive Disorders Extra
https://www.readbyqxmd.com/read/27788247/dependence-of-gait-deviation-on-weight-bearing-asymmetry-and-postural-instability-in-children-with-unilateral-cerebral-palsy
#15
Małgorzata Domagalska-Szopa, Andrzej Szopa, Andrzej Czamara
Postural control deficits have been suggested to be a major component of gait disorders in children with cerebral palsy. The purpose of this study was to investigate the relationship between postural stability and treadmill walking, in children with unilateral cerebral palsy, by defining dependence between the posturographic weight-bearing distribution and center of pressure (CoP) sway during quiet standing with Gillette Gait Index and the 16 distinct gait parameters that composed the Gillette Gait Index. Forty-five children with unilateral cerebral palsy from 7-12 years of age were included in this study...
2016: PloS One
https://www.readbyqxmd.com/read/27768216/effects-of-various-anchoring-components-and-loading-conditions-on-primary-stability-of-acetabular-revision-implant
#16
Christian Voigt, Andreas Schaller, Carsten Klöhn, Roger Scholz
PURPOSE: In revision total hip arthroplasty, until today, orthopaedic surgeons are missing evidence-based guidelines on cementless acetabular cup fixation. METHODS: 5 finite element models were generated featuring the following anchorage strategies: 1 short peg, 1 long peg, 2 long screws, 3 short screws and zero anchoring components for reference. The micromotions at the implant-bone interface were analyzed for 3 different loadcases, "Seated leg-crossing" (joint force 940 N, impingement force 750 N), "Normal gait" (joint force 1820 N), and "Stumbling" (joint force 4520 N)...
October 15, 2016: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/27765557/effects-of-talocrural-mobilization-with-movement-on-ankle-strength-mobility-and-weight-bearing-ability-in-hemiplegic-patients-with-chronic-stroke-a-randomized-controlled-trial
#17
Chang-Man An, Shin-Ok Jo
BACKGROUND AND OBJECTIVE: In general, adequate movement of the ankle joint is known to play an important role in functional activities. Stroke survivors frequently have limited range of motion of the ankle, leading to dysfunctional weight transfer toward the paretic lower limb during standing or gait. The purpose of this study was to investigate the effects of talocrural mobilization with movement (MWM) on ankle strength, dorsiflexion passive range of motion (DF-PROM), and weight-bearing ability on the paretic limb during standing or gait in stroke patients with limited ankle dorsiflexion...
October 17, 2016: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/27764120/exploring-the-use-of-non-image-based-ultrasound-to-detect-the-position-of-the-residual-femur-within-a-stump
#18
Sook-Yee Chong, Oliver Röhrle
A satisfactorily fitted socket interacts dynamically with the stump in order to support body weight, transmit load effectively, enhance dynamic stability, and enable the control and stabilization of the residual limb. The internal dynamics occurring within a socket is important in determining optimal fit. Many measurement and imaging techniques, such as X-rays, have been utilized to investigate the movement of the residual femur within the stump during gait. However, due to associated health risks and costs, none of the current techniques have been extended to clinical prosthetics...
2016: PloS One
https://www.readbyqxmd.com/read/27748686/spinocerebellar-ataxia-type-12-clues-to-pathogenesis
#19
Rachael L Cohen, Russell L Margolis
PURPOSE OF REVIEW: Spinocerebellar ataxia type 12 (SCA12) is a rare autosomal dominant neurodegenerative disease characterized by tremor, gait abnormalities, and neuropsychiatric syndromes. The location of the causative CAG/CTG expansion mutation in PPP2R2B, a gene encoding regulatory units of the protein phosphatase 2A, may provide unique insights into the pathogenesis of neurodegeneration. RECENT FINDINGS: The first neuropathological examination of a brain from an SCA12 patient revealed both cerebellar and cerebral cortical atrophy, with a noted loss of Purkinje cells and no evidence of polyglutamine aggregates...
December 2016: Current Opinion in Neurology
https://www.readbyqxmd.com/read/27744249/effects-of-belt-speed-on-the-body-s-center-of-mass-motion-relative-to-the-center-of-pressure-during-treadmill-walking
#20
Hsuan-Lun Lu, Tung-Wu Lu, Hsiu-Chen Lin, Hong-Jung Hsieh, Wing P Chan
Treadmills are often used in clinical settings to improve walking balance control in patients with gait impairments. However, knowledge of the effects of belt speed on balance control remains incomplete. The current study determined such effects in terms of inclination angles (IA) and the rate of change (RCIA) of the center of mass (COM) motion relative to the center of pressure (COP) in twelve healthy adults at five belt speeds, including the subjects' preferred walking speed (PWS), as measured using a motion capture system and an instrumented treadmill...
September 29, 2016: Gait & Posture
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