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https://www.readbyqxmd.com/read/28097064/phalangeal-joints-kinematics-during-ostrich-struthio-camelus-locomotion
#1
Rui Zhang, Qiaoli Ji, Gang Luo, Shuliang Xue, Songsong Ma, Jianqiao Li, Lei Ren
The ostrich is a highly cursorial bipedal land animal with a permanently elevated metatarsophalangeal joint supported by only two toes. Although locomotor kinematics in walking and running ostriches have been examined, these studies have been largely limited to above the metatarsophalangeal joint. In this study, kinematic data of all major toe joints were collected from gaits with double support (slow walking) to running during stance period in a semi-natural setup with two selected cooperative ostriches. Statistical analyses were conducted to investigate the effect of locomotor gait on toe joint kinematics...
2017: PeerJ
https://www.readbyqxmd.com/read/28077603/influence-of-focus-of-attention-reinvestment-and-fall-history-on-elderly-gait-stability
#2
Jonathan L A de Melker Worms, John F Stins, Erwin E H van Wegen, Ian D Loram, Peter J Beek
Falls represent a substantial risk in the elderly. Previous studies have found that a focus on the outcome or effect of the movement (external focus of attention) leads to improved balance performance, whereas a focus on the movement execution itself (internal focus of attention) impairs balance performance in elderly. A shift toward more conscious, explicit forms of motor control occurs when existing declarative knowledge is recruited in motor control, a phenomenon called reinvestment. We investigated the effects of attentional focus and reinvestment on gait stability in elderly fallers and nonfallers...
January 2017: Physiological Reports
https://www.readbyqxmd.com/read/28075434/diagnosis-and-surgical-correction-of-congenital-bilateral-patellar-luxation-in-two-dwarf-zebu-calves
#3
Göknil Kalayci, Cagri Binici, Julia Tünsmeyer, Silke Stein, Ahmad Al Aiyan, Kerstin Müller, Leo Brunnberg
This case study presents two female dwarf zebu calves with permanent bilateral flexion of the stifle joint secondary to bilateral congenital lateral patellar luxation. The patella could be manually repositioned bilaterally in the first calf (14 days old), but re-luxated immediately with release of manual pressure (luxation grade III). In the second calf (28 days old) both patellae were permanently luxated laterally (grade IV). The right and left stifles of each calf were operated in a staged procedure with approximately 14 days between surgery of the two sides...
January 11, 2017: Tierärztliche Praxis. Ausgabe G, Grosstiere/Nutztiere
https://www.readbyqxmd.com/read/28056109/postural-ataxia-in-cerebellar-downbeat-nystagmus-its-relation-to-visual-proprioceptive-and-vestibular-signals-and-cerebellar-atrophy
#4
Christoph Helmchen, Jan-Birger Kirchhoff, Martin Göttlich, Andreas Sprenger
BACKGROUND: The cerebellum integrates proprioceptive, vestibular and visual signals for postural control. Cerebellar patients with downbeat nystagmus (DBN) complain of unsteadiness of stance and gait as well as blurred vision and oscillopsia. OBJECTIVES: The aim of this study was to elucidate the differential role of visual input, gaze eccentricity, vestibular and proprioceptive input on the postural stability in a large cohort of cerebellar patients with DBN, in comparison to healthy age-matched control subjects...
2017: PloS One
https://www.readbyqxmd.com/read/28039539/a-wearable-proprioceptive-stabilizer-for-rehabilitation-of-limb-and-gait-ataxia-in-hereditary-cerebellar-ataxias-a-pilot-open-labeled-study
#5
Luca Leonardi, Maria Gabriella Aceto, Christian Marcotulli, Giuseppe Arcuria, Mariano Serrao, Francesco Pierelli, Paolo Paone, Alessandro Filla, Alessandro Roca, Carlo Casali
The aim of this pilot study is to test the feasibility and effectiveness of a wearable proprioceptive stabilizer that emits focal mechanical vibrations in patients affected by hereditary cerebellar ataxias. Eleven adult patients with a confirmed genetic diagnosis of autosomal dominant spinocerebellar ataxia or Friedreich's ataxia were asked to wear an active device for 3 weeks. Assessments were performed at baseline, after the device use (T1), and 3 weeks after (T2). SARA, 9-HPT, PATA, 6MWT, and spatial and temporal gait parameters, measured with a BTS-G-Walk inertial sensor, were used as study endpoints...
December 31, 2016: Neurological Sciences
https://www.readbyqxmd.com/read/28038342/atypical-anticipatory-postural-adjustments-during-gait-initiation-among-individuals-with-sub-acute-stroke
#6
Roshanth Rajachandrakumar, Julia E Fraser, Alison Schinkel-Ivy, Elizabeth L Inness, Lou Biasin, Karen Brunton, William E McIlroy, Avril Mansfield
Anticipatory postural adjustments, executed prior to gait initiation, help preserve lateral stability when stepping. Atypical patterns of anticipatory activity prior to gait initiation may occur in individuals with unilateral impairment (e.g., stroke). This study aimed to determine the prevalence, correlates, and consequences of atypical anticipatory postural adjustment patterns prior to gait initiation in a sub-acute stroke population. Forty independently-ambulatory individuals with sub-acute stroke stood on two force plates and initiated gait at a self-selected speed...
December 21, 2016: Gait & Posture
https://www.readbyqxmd.com/read/28038340/spatio-temporal-and-kinematic-gait-analysis-in-patients-with-frontotemporal-dementia-and-alzheimer-s-disease-through-3d-motion-capture
#7
Rosaria Rucco, Valeria Agosti, Francesca Jacini, Pierpaolo Sorrentino, Pasquale Varriale, Manuela De Stefano, Graziella Milan, Patrizia Montella, Giuseppe Sorrentino
Alzheimer's disease (AD) and behavioral variant of Frontotemporal Dementia (bvFTD) are characterized respectively by atrophy in the medial temporal lobe with memory loss and prefrontal and anterior temporal degeneration with dysexecutive syndrome. In this study, we hypothesized that specific gait patterns are induced by either frontal or temporal degeneration. To test this hypothesis, we studied the gait pattern in bvFTD (23) and AD (22) patients in single and dual task ("motor" and "cognitive") conditions...
December 21, 2016: Gait & Posture
https://www.readbyqxmd.com/read/28029280/biomechanics-of-an-orthosis-managed-cranial-cruciate-ligament-deficient-canine-stifle-joint-predicted-by-use-of-a-computer-model
#8
Gina E Bertocci, Nathan P Brown, Patrice M Mich
OBJECTIVE To evaluate effects of an orthosis on biomechanics of a cranial cruciate ligament (CrCL)-deficient canine stifle joint by use of a 3-D quasistatic rigid-body pelvic limb computer model simulating the stance phase of gait and to investigate influences of orthosis hinge stiffness (durometer). SAMPLE A previously developed computer simulation model for a healthy 33-kg 5-year-old neutered Golden Retriever. PROCEDURES A custom stifle joint orthosis was implemented in the CrCL-deficient pelvic limb computer simulation model...
January 2017: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/28018651/stability-in-skipping-gaits
#9
Emanuel Andrada, Roy Müller, Reinhard Blickhan
As an alternative to walking and running, humans are able to skip. However, adult humans avoid it. This fact seems to be related to the higher energetic costs associated with skipping. Still, children, some birds, lemurs and lizards use skipping gaits during daily locomotion. We combined experimental data on humans with numerical simulations to test whether stability and robustness motivate this choice. Parameters for modelling were obtained from 10 male subjects. They locomoted using unilateral skipping along a 12 m runway...
November 2016: Royal Society Open Science
https://www.readbyqxmd.com/read/28018127/influence-of-j-curve-spring-stiffness-on-running-speeds-of-segmented-legs-during-high-speed-locomotion
#10
Runxiao Wang, Wentao Zhao, Shujun Li, Shunqi Zhang
Both the linear leg spring model and the two-segment leg model with constant spring stiffness have been broadly used as template models to investigate bouncing gaits for legged robots with compliant legs. In addition to these two models, the other stiffness leg spring models developed using inspiration from biological characteristic have the potential to improve high-speed running capacity of spring-legged robots. In this paper, we investigate the effects of "J"-curve spring stiffness inspired by biological materials on running speeds of segmented legs during high-speed locomotion...
2016: Applied Bionics and Biomechanics
https://www.readbyqxmd.com/read/28017232/stiff-person-syndrome-masquerading-as-multiple-sclerosis
#11
Joseph J Sabatino, Scott D Newsome
BACKGROUND: Stiff person syndrome (SPS) is a rare neuroimmunological disorder presenting with a wide variety of signs and symptoms that mimic neuro-inflammatory diseases, such as multiple sclerosis (MS), thus delaying diagnosis. METHODS: We performed a retrospective chart review of over 100 patients with SPS who were treated at Johns Hopkins Hospital and identified five patients previously diagnosed with MS. RESULTS: Patients were female with a mean age of 53years old (range 43-64)...
January 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28013150/old-adult-fallers-display-reduced-flexibility-of-arm-and-trunk-movements-when-challenged-with-different-walking-speeds
#12
Nataliya Shishov, Yoav Gimmon, Hisham Rashed, Ilan Kurz, Raziel Riemer, Amir Shapiro, Ronen Debi, Itshak Melzer
Specific patterns of pelvic and thorax motions are required to maintain stability during walking. This cross-sectional study explored older-adults' gait kinematics and their kinematic adaptations to different walking speeds, with the purpose of identifying mechanisms that might be related to increased risk for falls. Fifty-eight older adults from self-care residential facilities walked on a treadmill, whose velocity was systematically increased with increments of 0.1meters/second (m/s) from 0.5 to 0.9m/s, and then similarly decreased...
December 5, 2016: Gait & Posture
https://www.readbyqxmd.com/read/28009675/effects-of-foot-and-ankle-devices-on-balance-gait-and-falls-in-adults-with-sensory-perception-loss-a-systematic-review
#13
Joanne Paton, Anna L Hatton, Keith Rome, Bridie Kent
BACKGROUND: Foot and ankle devices are being developed as a method of preventing people with sensory perception loss sustaining a fall. Such devices are believed to work by reducing the likelihood of a fall by improving the balance and gait of the user. OBJECTIVES: The objective of the review was to evaluate the effectiveness of foot and ankle devices for the prevention of falls and the improvement of balance and gait in adults with sensory perception loss. INCLUSION CRITERIA TYPES OF PARTICIPANTS: Participants were community-dwelling adults with bilateral pathological sensory perception loss...
December 2016: JBI Database of Systematic Reviews and Implementation Reports
https://www.readbyqxmd.com/read/28004127/-surgical-access-routes-to-the-hip-joint-in-the-elderly
#14
M Nogler, M Thaler
There are a large number of different approaches to the hip joint. Several conventional and minimally invasive portals exist and numerous technical variations with different instrument sets are available. All approaches can be regarded as standard and can be utilized lege artis. The main differences between approaches are their potential to preserve muscles and avoid damage which would slow down rehabilitation and mobilization. In the elderly the preservation of abductor function is, in the authors' opinion, of utmost importance...
December 21, 2016: Der Orthopäde
https://www.readbyqxmd.com/read/27993586/imposed-faster-and-slower-walking-speeds-influence-gait-stability-differently-in-parkinson-fallers
#15
Michael H Cole, Matthew Sweeney, Zachary J Conway, Tim Blackmore, Peter A Silburn
OBJECTIVE: This cross-sectional study sought to evaluate the effect of imposed faster and slower walking speeds on postural stability in people with Parkinson's disease (PD). DESIGN: Cross-sectional cohort study; SETTING: General community PARTICIPANTS: 84 PD patients (51 with a falls history; 33 without) and 82 age-matched controls were invited to participate via neurology clinics and pre-existing databases. Of those contacted, 99 did not respond (PD=36; controls=63) and 27 were not interested (PD=18; controls=9)...
December 16, 2016: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/27977518/effects-of-2-years-of-exercise-on-gait-impairment-in-people-with-parkinson-disease-the-pret-pd-randomized-trial
#16
Miriam R Rafferty, Janey Prodoehl, Julie A Robichaud, Fabian J David, Cynthia Poon, Lisa C Goelz, David E Vaillancourt, Wendy M Kohrt, Cynthia L Comella, Daniel M Corcos
BACKGROUND AND PURPOSE: This study presents a secondary analysis from the Progressive Resistance Exercise Training in Parkinson Disease (PRET-PD) trial investigating the effects of progressive resistance exercise (PRE) and a Parkinson disease (PD)-specific multimodal exercise program, modified Fitness Counts (mFC), on spatial, temporal, and stability-related gait impairments in people with PD. METHODS: Forty-eight people with PD were randomized to participate in PRE or mFC 2 times a week for 24 months; 38 completed the study...
January 2017: Journal of Neurologic Physical Therapy: JNPT
https://www.readbyqxmd.com/read/27957593/-rotation-or-derotation-osteotomy-of-the-tibia
#17
D Kolp, K Ziebarth, T Slongo
OBJECTIVE: Corrections for congenital or posttraumatic malrotation of the lower leg, considering alignment of the contralateral leg, with an osteotomy and fixation using locking compression plates (LCP). INDICATIONS: Posttraumatic deformity due to malunion. Increased tibial torsion in residual clubfoot deformity as long as the foot has been realigned. Idiopathic internal or external rotational deformity if the child is regularly tripping and falling, has psychological problems (other children making fun of the child because of the unusual gait), or is bothered by the deformity (age > 10 years, relative indication)...
December 12, 2016: Operative Orthopädie und Traumatologie
https://www.readbyqxmd.com/read/27939172/stable-bipedal-walking-with-a-swing-leg-protraction-strategy
#18
Pranav A Bhounsule, Ali Zamani
In bipedal locomotion, swing-leg protraction and retraction refer to the forward and backward motion, respectively, of the swing-leg before touchdown. Past studies have shown that swing-leg retraction strategy can lead to stable walking. We show that swing-leg protraction can also lead to stable walking. We use a simple 2D model of passive dynamic walking but with the addition of an actuator between the legs. We use the actuator to do full correction of the disturbance in a single step (a one-step dead-beat control)...
January 25, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/27919792/the-role-of-posturography-in-assessing-the-process-of-rehabilitation-in-poststroke-patients-a-case-study
#19
Witold Rongies, Bartosz Słomka, Angelika Duczek, Włodzimierz Dolecki
Stroke is one of the most common causes of death and disability both in Poland and around the world. Each year, 250 out of 100,000 people in Europe are diagnosed with a disruption of cerebral perfusion in the form of stroke. In Poland, approximately 65,000-70,000 people are affected each year, with the incidence steadily increasing. Stroke survivors suffer from impaired cognitive and motor functions. Moreover, they exhibit severe gait pattern abnormalities, which together with balance disorders, constitute the main factors increasing the risk of falls in this patient group...
December 2, 2016: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/27913354/a-novel-elastic-force-field-to-influence-mediolateral-foot-placement-during-walking
#20
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
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