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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
#1
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/28814046/adaptive-control-of-an-actuated-ankle-foot-orthosis
#2
Victor Arnez-Paniagua, Hala Rifai, Yacine Amirat, Samer Mohammed
This paper deals with the control of an active ankle foot orthosis (AAFO) to assist the gait of paretic patients. The AAFO system is driven by both, the residual human torque delivered by the muscles spanning the ankle joint and the AAFO's actuator's torque. A projection-based model reference adaptive control is proposed to assist dorsiflexion and plantar-flexion of the ankle joint during daily living walking activities. Unlike most classical model-based controllers, the proposed one does not require any prior estimation of the system's (foot-AAFO) parameters...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28814021/simultaneous-estimation-of-human-and-exoskeleton-motion-a-simplified-protocol
#3
M T Alvarez, D Torricelli, A J Del-Ama, D Pinto, J Gonzalez-Vargas, J C Moreno, A Gil-Agudo, J L Pons
Adequate benchmarking procedures in the area of wearable robots is gaining importance in order to compare different devices on a quantitative basis, improve them and support the standardization and regulation procedures. Performance assessment usually focuses on the execution of locomotion tasks, and is mostly based on kinematic-related measures. Typical drawbacks of marker-based motion capture systems, gold standard for measure of human limb motion, become challenging when measuring limb kinematics, due to the concomitant presence of the robot...
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
#4
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/28813975/a-lightweight-robotic-ankle-prosthesis-with-non-backdrivable-cam-based-transmission
#5
Tommaso Lenzi, Marco Cempini, Jeremy Newkirk, Levi J Hargrove, Todd A Kuiken
Below-knee level amputation significantly impacts the ability of an individual to ambulate. Transtibial amputees are typically prescribed energetically passive ankle-foot prostheses that behave as a spring or controlled damper, and therefore cannot fully replace the function of the missing limb. More recently, fully-powered devices have been proposed to more closely match the power generation ability of intact limbs. However, these fully-powered devices are significantly heavier than passive devices, thus increasing the stress on the socket-residual limb interface...
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
#6
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]
https://www.readbyqxmd.com/read/28813839/timing-of-intermittent-torque-control-with-wire-driven-gait-training-robot-lifting-toe-trajectory-for-trip-avoidance
#7
Tamon Miyake, Yo Kobayashi, Masakatsu G Fujie, Shigeki Sugano
Gait training robots are useful for changing gait patterns and decreasing risk of trip. Previous research has reported that decreasing duration of the assistance or guidance of the robot is beneficial for efficient gait training. Although robotic intermittent control method for assisting joint motion has been established, the effect of the robot intervention timing on change of toe clearance is unclear. In this paper, we tested different timings of applying torque to the knee, employing the intermittent control of a gait training robot to increase toe clearance throughout the swing phase...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813836/development-of-new-rehabilitation-robot-device-that-can-be-attached-to-the-conventional-knee-ankle-foot-orthosis-for-controlling-the-knee-in-individuals-after-stroke
#8
Kawasaki Shihomi, Ohata Koji, Tsuboyama Tadao, Sawada Yuichi, Higashi Yoshiyuki
This research developed a device that can be attached to the conventional Knee-Ankle-Foot-Orthosis for controlling the knee in individuals after stroke. The device automatically assists the flexion and extension movements of the knee joint at the appropriate timing. We aimed to clarify the effect of this device on gait performance, kinematic pattern and muscle activation during gait. Seventeen participants after stroke were recruited in this study. They walked with this device for 3 minutes, and we measured the 10m gait time, number of steps, knee motion using electric goniometer and muscle activities of lower limbs during gait...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813832/design-and-experimental-evaluation-of-a-lightweight-high-torque-and-compliant-actuator-for-an-active-ankle-foot-orthosis
#9
Marta Moltedo, Tomislav Bacek, Kevin Langlois, Karen Junius, Bram Vanderborght, Dirk Lefeber
The human ankle joint plays a crucial role during walking. At the push-off phase the ankle plantarflexors generate the highest torque among the lower limb joints during this activity. The potential of the ankle plantarflexors is affected by numerous pathologies and injuries, which cause a decrease in the ability of the subject to achieve a natural gait pattern. Active orthoses have shown to have potential in assisting these subjects. The design of such robots is very challenging due to the contrasting design requirements of wearability (light weight and compact) and high torques capacity...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813820/design-of-an-exoskeleton-ankle-robot-for-robot-assisted-gait-training-of-stroke-patients
#10
Ling-Fung Yeung, Corinna Ockenfeld, Man-Kit Pang, Hon-Wah Wai, Oi-Yan Soo, Sheung-Wai Li, Kai-Yu Tong
Lower Limb Exoskeleton robot that can facilitate stair walking is a big challenge, most systems could only provide level ground walking. In this study, a lightweight (0.5kg at ankle, 0.5kg at waist for control box) and autonomous exoskeleton Ankle Robot was proposed to provide power assistance for gait training of chronic stroke patients and it can facilitate three walking conditions in real-time: (1) level walking, (2) stair ascending, and (3) stair descending. Chronic stroke patients (n=3) with drop foot gait deficit and moderate motor impairment were recruited to evaluate the system under different walking conditions (Functional Ambulatory Category: FAC=4...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28812410/good-outcome-scores-and-high-satisfaction-rate-after-primary-total-ankle-replacement
#11
Ilka Kamrad, Åke Carlsson, Anders Henricson, Håkan Magnusson, Magnus K Karlsson, Björn E Rosengren
Background and purpose - Total ankle replacement (TAR) is gaining popularity for treatment of end-stage ankle arthritis. Large patient-centered outcome studies are, however, few. Here, we report data from the Swedish Ankle Registry. Patients and methods - We examined outcomes after primary TAR in patients from the Swedish Ankle Registry using PROMs (Patient Reported Outcome Measures; generic: EQ-5D and SF-36, region specific: SEFAS (Self-Reported Foot and Ankle Score), and a question on satisfaction). We included 241 patients registered with primary TAR between 2008 and 2016 and who completed PROMs preoperatively and postoperatively up to 24 months...
August 16, 2017: Acta Orthopaedica
https://www.readbyqxmd.com/read/28809629/-talar-neck-fractures-treated-using-percutaneous-screw-fixation
#12
R Veselý, M Kelbl, J Kacián, V Hulka, J Kočiš, R Kunovský
PURPOSE OF THE STUDY Closed reduction and percutaneous fixation of nondisplaced talar neck fractures have been applied by some authors. The aim of this paper is to assess the results and complications of this minimally invasive technique. MATERIAL AND METHODS In the period from 2009 to 2014, twenty-one patients with a talar neck fracture were observed after closed reduction and percutaneous screw fixation in the Traumatological Hospital in Brno. The mean age of the patients was 38 years (range 18-56 years)...
2017: Acta Chirurgiae Orthopaedicae et Traumatologiae Cechoslovaca
https://www.readbyqxmd.com/read/28807512/non-linear-finite-element-model-to-assess-the-effect-of-tendon-forces-on-the-foot-ankle-complex
#13
Enrique Morales-Orcajo, Thales R Souza, Javier Bayod, Estevam Barbosa de Las Casas
A three-dimensional foot finite element model with actual geometry and non-linear behavior of tendons is presented. The model is intended for analysis of the lower limb tendon forces effect in the inner foot structure. The geometry of the model was obtained from computational tomographies and magnetic resonance images. Tendon tissue was characterized with the first order Ogden material model based on experimental data from human foot tendons. Kinetic data was employed to set the load conditions. After model validation, a force sensitivity study of the five major foot extrinsic tendons was conducted to evaluate the function of each tendon...
August 11, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28807431/a-prospective-analysis-of-injury-rates-patterns-and-causes-in-cliff-and-splash-diving
#14
Lukas Ernstbrunner, Armin Runer, Paul Siegert, Matthäus Ernstbrunner, Johannes Becker, Thomas Freude, Herbert Resch, Philipp Moroder
INTRODUCTION: Information about injuries and its differences in Cliff Diving (CD) and Splash Diving (SD) are unknown. It was the aim to analyse (1) injury rates, patterns and causes; (2) differences (in injuries) between both disciplines; and to (3) identify targets for future injury prevention interventions. METHODS: From April to November 2013, 81 cliff and 51 splash divers were prospectively surveyed with an encrypted, monthly e-mail-based questionnaire. RESULTS: During a total of 7857h diving with an average diving height of 13 (±7)m, an overall injury rate of 7...
August 5, 2017: Injury
https://www.readbyqxmd.com/read/28807379/surgical-correction-of-haglund-s-triad-using-a-central-tendon-splitting-approach-a-retrospective-outcomes-study
#15
Zhan Xia, Andy Khye Soon Yew, Ting Karen Zhang, Hsien Ching David Su, Yung Chuan Sean Ng, Inderjeet Singh Rikhraj
We evaluated the surgical outcomes of Haglund's triad using a central tendon-splitting approach, with Achilles tendon partial detachment and debridement, excision of the retrocalcaneal bursa, resection of Haglund's prominence, and reattachment of the Achilles tendon. The medical records of 22 patients (22 heels) who had undergone surgical correction of Haglund's triad from January 2010 to December 2015 were reviewed retrospectively. The visual analog scale pain score, American Orthopaedic Foot and Ankle Society (AOFAS) Ankle-Hindfoot scale score, and 36-item Short-Form Health Survey physical and mental component scores were prospectively collected preoperatively, 6 months postoperatively, and at the last visit...
August 11, 2017: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/28807025/changes-in-tibialis-anterior-architecture-affect-the-amplitude-of-surface-electromyograms
#16
Taian M Vieira, Maria Cristina Bisi, Rita Stagni, Alberto Botter
BACKGROUND: Variations in the amplitude of surface electromyograms (EMGs) are typically considered to advance inferences on the timing and degree of muscle activation in different circumstances. Surface EMGs are however affected by factors other than the muscle neural drive. In this study, we use electrical stimulation to investigate whether architectural changes in tibialis anterior (TA), a key muscle for balance and gait, affect the amplitude of surface EMGs. METHODS: Current pulses (500 μs; 2 pps) were applied to the fibular nerve of ten participants, with the ankle at neutral, full dorsi and full plantar flexion positions...
August 14, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28806248/bone-spect-ct-localizes-increased-bone-metabolism-and-subsequent-bone-resorption-in-reflex-sympathetic-dystrophy
#17
Hidetoshi Narimatsu, Tadaki Nakahara, Sayuri Kodama, Hiromi Hisazumi, Shinichi Tominaga, Kiyoshi Ohkuma, Masahiro Jinzaki
A 64-year-old man with lung cancer with a history of revascularization of the occluded right femoral artery underwent bone scintigraphy, which showed intense uptake in the distal side of the right leg. The additional SPECT/CT clarified that the uptake was predominantly increased in the epiphyses of the right ankle and foot with possible osteopenia. One month later, follow-up SPECT/CT showed the manifestation of periosteal resorption in the hypermetabolic sites with slight decrease in bone metabolism. Radiological correlation between bone metabolism and subsequent bone resorption in addition to clinical symptoms in this patient suggested the diagnosis of reflex sympathetic dystrophy...
August 12, 2017: Clinical Nuclear Medicine
https://www.readbyqxmd.com/read/28805066/active-controlled-motion-in-early-rehabilitation-improves-outcome-after-ankle-fractures-a-randomized-controlled-trial
#18
Hendrik Jansen, Martin Jordan, Sönke Frey, Stefanie Hölscher-Doht, Rainer Meffert, Timo Heintel
OBJECTIVE: To evaluate the use of active controlled motion (ACM) after unstable ankle fractures needing initial partial weight-bearing. DESIGN: Prospective randomized controlled trial. SETTING: Inpatient and outpatient clinic. SUBJECTS: A total of 50 patients with unstable ankle fractures and the need for partial weight-bearing for six weeks. INTERVENTIONS: Randomization in two groups: physiotherapy alone or physiotherapy with an additional ACM device...
August 1, 2017: Clinical Rehabilitation
https://www.readbyqxmd.com/read/28804593/an-innovative-sealed-shoe-to-off-load-and-heal-diabetic-forefoot-ulcers-a-feasibility-study
#19
Gustav Jarl, Roy Tranberg
Background: Non-removable knee-high devices are the gold standard to treat diabetic foot ulcers located on the plantar forefoot, but they immobilize the ankle, which restricts daily life activities and has negative effects on joint functioning. Objective: To investigate the feasibility of sealing a therapeutic shoe to off-load and heal diabetic forefoot ulcers. Design: A case series of seven men with type 2 diabetes and a metatarsal head ulcer were prescribed therapeutic shoes and custom-made insoles. The shoe was sealed with a plastic band...
2017: Diabetic Foot & Ankle
https://www.readbyqxmd.com/read/28802698/in-hospital-costs-of-diabetic-foot-disease-treated-by-a-multidisciplinary-foot-team
#20
Willem D Rinkel, Jacky Luiten, Jelle van Dongen, Bram Kuppens, Johan W Van Neck, Suzanne Polinder, Manuel Castro Cabezas, J Henk Coert
BACKGROUND: The diabetic foot imposes significant burden on healthcare systems. Obtaining knowledge on the extent of the costs of diabetic foot ulcers (DFUs) is of value to health care researchers investigating cost-effectiveness of interventions that prevent these costly complications. OBJECTIVES: To estimate the in-hospital costs associated with the treatment of DFUs by a multidisciplinary diabetic foot team. METHODS: Persons with DFUs presenting to our team in 2013 and 2014 were followed and use of care was estimated...
July 29, 2017: Diabetes Research and Clinical Practice
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