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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/28814025/learning-from-demonstration-teaching-a-myoelectric-prosthesis-with-an-intact-limb-via-reinforcement-learning
#2
Gautham Vasan, Patrick M Pilarski
Prosthetic arms should restore and extend the capabilities of someone with an amputation. They should move naturally and be able to perform elegant, coordinated movements that approximate those of a biological arm. Despite these objectives, the control of modern-day prostheses is often nonintuitive and taxing. Existing devices and control approaches do not yet give users the ability to effect highly synergistic movements during their daily-life control of a prosthetic device. As a step towards improving the control of prosthetic arms and hands, we introduce an intuitive approach to training a prosthetic control system that helps a user achieve hard-to-engineer control behaviours...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813996/analyzing-at-home-prosthesis-use-in-unilateral-upper-limb-amputees-to-inform-treatment-device-design
#3
Adam J Spiers, Linda Resnik, Aaron M Dollar
New upper limb prosthetic devices are continuously being developed by a variety of industrial, academic, and hobbyist groups. Yet, little research has evaluated the long term use of currently available prostheses in daily life activities, beyond laboratory or survey studies. We seek to objectively measure how experienced unilateral upper limb prosthesis-users employ their prosthetic devices and unaffected limb for manipulation during everyday activities. In particular, our goal is to create a method for evaluating all types of amputee manipulation, including non-prehensile actions beyond conventional grasp functions, as well as to examine the relative use of both limbs in unilateral and bilateral cases...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813993/the-influence-of-a-user-adaptive-prosthetic-knee-on-planned-gait-termination
#4
Erik C Prinsen, Marc J Nederhand, Bart F Koopman, Johan S Rietman
The added value of user-adaptive prosthetic knees has been predominantly evaluated in level walking or ramp/stair negotiation. Previous studies indicate that the activity pattern of individuals with an amputation mainly consists of short periods of continuous walking, indicating that a high percentage of ambulatory activity involves gait termination. The potential added value of user-adaptive prosthetic knees in gait termination has not been studied yet. Ten individuals with an amputation were measured with their own non-microprocessor controlled prosthetic knee and with the Rheo Knee II (a user-adaptive prosthetic knee)...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813991/voluntary-phantom-hand-and-finger-movements-in-transhumerai-amputees-could-be-used-to-naturally-control-polydigital-prostheses
#5
Nathanael Jarrasse, Caroline Nicol, Florian Richer, Amelie Touillet, Noel Martinet, Jean Paysant, Jozina B De Graaf
An arm amputation is extremely invalidating since many of our daily tasks require bi-manual and precise control of hand movements. Perfect hand prostheses should therefore offer a natural, intuitive and cognitively simple control over their numerous biomimetic active degrees of freedom. While efficient polydigital prostheses are commercially available, their control remains complex to master and offers limited possibilities, especially for high amputation levels. In this pilot study, we demonstrate the possibility for upper-arm amputees to intuitively control a polydigital hand prosthesis by using surface myoelectric activities of residual limb muscles (sEMG) associated with phantom limb movements, even if these residual arm muscles on which the phantom activity is measured were not naturally associated with hand movements before amputation...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813980/human-mimetic-forearm-mechanism-towards-bionic-arm
#6
Minsang Seo, Hogyun Kim, Youngjin Choi
The paper presents a mechanical forearm mechanism to extend the pronation and supination (P/S) movement of the trans-radial amputee when he/she is able to conduct the P/S motion partially with his/her remaining forearm. The P/S motions of the existing prostheses and robotic arms developed till now are completely different from those of the human. When we are to develop the robotic prostheses for the amputees, two important issues should be considered such as cosmetic issue to look like normal arm and motion harmony issue between robotic prosthesis and the amputated living arm...
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
#7
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/28813974/a-cosmetic-prosthetic-digit-with-bioinspired-embedded-touch-feedback
#8
Diego Barone, Marco D'Alonzo, Marco Controzzi, Francesco Clemente, Christian Cipriani
Partial hand amputation is the most frequent amputation level worldwide, accounting for approximately 90% of all upper limb amputations. Passive cosmetic prostheses represent one of the possible choices for its treatment, probably the most affordable one. However, these devices restore very limited motor function and subtle sensory feedback. The latter is an important component for restoring the body schema. In this work we present a simple yet potentially effective and low cost cosmetic digital prosthesis that embeds touch feedback; we dubbed this DESC-finger...
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
#9
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/28813772/pilot-study-to-determine-safety-and-efficacy-of-paclitaxel-infusion-in-de-novo-peripheral-lesions-using-the-atrium-clearway-balloon
#10
Joseph Anderson, Laura Danielson, Jodan Anderson, Katie Pohlson, Tyler Remund, Chad Laurich, Greg Schultz, Angelo Santos, Gopinath Mani, Patrick Kelly, Andrea Shermann
OBJECTIVE: To evaluate the safety and efficacy of a one-time infusion of paclitaxel through an Atrium ClearWay balloon in infra inguinal de novo peripheral lesions. METHODS: This is a single-center prospective study looking at treatment of 50 limbs. Treatment includes standard infra inguinal endovascular revascularization followed by a pre-prescribed infusion of paclitaxel. Control is standard reintervention without subsequent paclitaxel infusion. Patients were followed at one, four, and 10 months with ankle-brachial index (ABI)s, arterial duplex of the treated limb, and Rutherford classification stage measured before and after procedures and at each follow-up...
March 2017: South Dakota Medicine: the Journal of the South Dakota State Medical Association
https://www.readbyqxmd.com/read/28813728/-amputation-of-the-lower-limb-treatment-and-management
#11
Tim Ramczykowski, Thomas A Schildhauer
Despite modern conservative and surgical procedures, the number of amputations of the lower limb remains at a consistently high level. With the demographic changes and the consequent prevalence of atherosclerosis and diabetes mellitus, there is a steady increase of the risk factors that can lead to an amputation. The cause, which ultimately leads to the loss of the affected limb is therefore a symptom of the underlying disease. Primarily, the purpose of any medical treatment is the prevention of any amputation...
August 2017: Zeitschrift Für Orthopädie und Unfallchirurgie
https://www.readbyqxmd.com/read/28813636/using-systems-science-to-inform-population-health-strategies-in-local-health-departments-a-case-study-in-san-antonio-texas
#12
Yan Li, Norma A Padrón, Anil T Mangla, Pamela G Russo, Thomas Schlenker, José A Pagán
OBJECTIVES: Because of state and federal health care reform, local health departments play an increasingly prominent role leading and coordinating disease prevention programs in the United States. This case study shows how a local health department working in chronic disease prevention and management can use systems science and evidence-based decision making to inform program selection, implementation, and assessment; enhance engagement with local health systems and organizations; and possibly optimize health care delivery and population health...
January 1, 2017: Public Health Reports
https://www.readbyqxmd.com/read/28812462/severe-intrauterine-amputations-in-one-dichorionic-twin-with-pentalogy-of-cantrell-further-evidence-and-consideration-for-mechanical-teratogenesis
#13
Víctor M Salinas-Torres, Estivaliz A De La O-Espinoza, Rafael A Salinas-Torres
Pentalogy of Cantrell (PC) is characterized by midline supraumbilical abdominal wall defect, lower sternum defect, anterior diaphragmatic and pericardial defect, and congenital cardiac anomalies. Several etiological influences have been postulated, however, most of the reported cases are sporadic. In addition, evidence for mechanical teratogenesis in PC is limited. Here, we describe in one dichorionic twin with complete PC, additional severe intrauterine amputations (mainly head and neck) not previously reported resultant from mechanical teratogenesis...
September 2017: Pediatric and Developmental Pathology
https://www.readbyqxmd.com/read/28812396/the-influence-of-lower-limb-prostheses-technology-on-paracanoeing-time-trial-performance
#14
Shelley Ellis, Andrew Callaway, Bryce Dyer
Within the Paracanoeing discipline, it is important to ensure that appropriate control is achieved by a paddler with a disability. However, this Paralympic Games discipline has seen very little attention to date. The aims of this study were to understand the kinematic impact to a paracanoeist when not utilizing the use of a prosthetic lower-limb. A kayaker with a uni-lateral transfemoral amputation completed several 200 m maximal efforts both with and without their prosthesis. When the prosthetic limb was removed, there were significant differences found in stroke rate, stroke speed, stroke length and overall power output...
August 16, 2017: Disability and Rehabilitation. Assistive Technology
https://www.readbyqxmd.com/read/28811310/live-fate-mapping-of-joint-associated-fibroblasts-visualizes-expansion-of-cell-contributions-during-zebrafish-fin-regeneration
#15
Valerie A Tornini, John D Thompson, Raymond L Allen, Kenneth D Poss
The blastema is a mass of progenitor cells responsible for regeneration of amputated salamander limbs and fish fins. Previous studies have indicated that resident cell sources producing the blastema contribute lineage-restricted progeny to regenerating tissue. However, these studies have labeled general cell types rather than granular cell subpopulations, and they do not explain the developmental transitions that must occur for distal structures to arise from cells with proximal identities in the appendage stump...
August 15, 2017: Development
https://www.readbyqxmd.com/read/28807513/second-generation-prototype-of-a-variable-stiffness-transverse-plane-adapter-for-a-lower-limb-prosthesis
#16
Corey Pew, Glenn K Klute
The prescription and fitting of a traditional lower limb prosthesis often focuses on straight walking, neglecting maneuvers such as turning and pivoting that require flexibility in the transverse plane. Current devices that allow transverse plane movement only offer a fixed stiffness and are incapable of adapting to varying daily activities. Pilot testing of a first-generation variable stiffness torsion adapter (VSTA I) showed a benefit for individuals with lower limb amputation by reducing peak transverse plane moments at the residual limb which could lead to increased comfort, but testing was limited due to excessive device height and mass...
August 11, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28807382/association-between-statin-therapy-and-amputation-free-survival-in-patients-with-critical-limb-ischemia-in-the-critisch-registry
#17
Konstantinos Stavroulakis, Matthias Borowski, Giovanni Torsello, Theodosios Bisdas
OBJECTIVE: Secondary prevention in patients with critical limb ischemia (CLI) is crucial for the reduction of cardiovascular morbidity and mortality. Nonetheless, current recommendations are extrapolated from other high-risk populations because of the lack of CLI-dedicated trials. The aim of this explorative study was to evaluate the association of statin therapy with the outcomes of CLI patients. METHODS: The First-Line Treatments in Patients With Critical Limb Ischemia (CRITISCH) registry is a prospective multicenter registry analyzing the effectiveness of all available treatment strategies in 1200 CLI patients...
August 11, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28807206/graft-loss-review-of-a-single-burn-center-s-experience-and-proposal-of-a-graft-loss-grading-scale
#18
Lauren B Nosanov, Melissa M McLawhorn, Lamisa Hassan, Taryn E Travis, Shawn Tejiram, Laura S Johnson, Lauren T Moffatt, Jeffrey W Shupp
BACKGROUND: There exists neither a consensus definition of burn "graft loss" nor a scale with which to grade severity. We introduced an institutional scale in 2014 for quality improvement. MATERIALS AND METHODS: We reviewed all burned patients with graft loss on departmental Morbidity and Mortality reports between July 2014 and July 2016. Graft loss grades were assigned during the course of clinical care per institutional scale. Chronic nonhealing wounds and nonburn wounds were excluded...
August 2017: Journal of Surgical Research
https://www.readbyqxmd.com/read/28807038/nlr-mlp-svm-and-lda-a-comparative-analysis-on-emg-data-from-people-with-trans-radial-amputation
#19
Alberto Dellacasa Bellingegni, Emanuele Gruppioni, Giorgio Colazzo, Angelo Davalli, Rinaldo Sacchetti, Eugenio Guglielmelli, Loredana Zollo
BACKGROUND: Currently, the typically adopted hand prosthesis surface electromyography (sEMG) control strategies do not provide the users with a natural control feeling and do not exploit all the potential of commercially available multi-fingered hand prostheses. Pattern recognition and machine learning techniques applied to sEMG can be effective for a natural control based on the residual muscles contraction of amputated people corresponding to phantom limb movements. As the researches has reached an advanced grade accuracy, these algorithms have been proved and the embedding is necessary for the realization of prosthetic devices...
August 14, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28806827/-functional-outcome-following-high-pressure-injection-injuries-of-the-hand
#20
Florian Neubrech, Christian A Radu, David Pauli, Berthold Bickert, Ulrich Kneser, Leila Harhaus
Background High-pressure injection injuries are devastating injuries that often lead to an amputation of the primarily affected finger. The available literature mainly focuses on amputation rates, while there is a lack of knowledge regarding functional results. Patients and Methods Between 1998 and 2016, 47 cases of high-pressure injection injuries of the hand were registered in our department. Out of these, data of 26 patients, all men with an average age of 42 (18-62) years, were included in a retrospective follow-up examination after 4 (1-12) years...
August 2017: Handchirurgie, Mikrochirurgie, Plastische Chirurgie
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