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Limb amputation

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https://www.readbyqxmd.com/read/28814025/learning-from-demonstration-teaching-a-myoelectric-prosthesis-with-an-intact-limb-via-reinforcement-learning
#1
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
#2
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/28813991/voluntary-phantom-hand-and-finger-movements-in-transhumerai-amputees-could-be-used-to-naturally-control-polydigital-prostheses
#3
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/28813975/a-lightweight-robotic-ankle-prosthesis-with-non-backdrivable-cam-based-transmission
#4
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
#5
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/28813772/pilot-study-to-determine-safety-and-efficacy-of-paclitaxel-infusion-in-de-novo-peripheral-lesions-using-the-atrium-clearway-balloon
#6
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
#7
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/28812396/the-influence-of-lower-limb-prostheses-technology-on-paracanoeing-time-trial-performance
#8
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
#9
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
#10
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
#11
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/28807038/nlr-mlp-svm-and-lda-a-comparative-analysis-on-emg-data-from-people-with-trans-radial-amputation
#12
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/28802661/efficacy-of-isolated-limb-perfusion-ilp-in-patients-with-merkel-cell-carcinoma-mcc-a-multicenter-experience
#13
L M van Veenendaal, M F Madu, M E T Tesselaar, C Verhoef, D J Grünhagen, A C J van Akkooi
BACKGROUND: Merkel cell carcinoma (MCC) is a rare and potentially aggressive neuroendocrine tumor of the skin, with a propensity for locoregional metastases. In two expert referral centers, isolated limb perfusion (ILP) is used to obtain locoregional control in selected locoregionally advanced MCC patients. This study describes our experience. METHOD: Patients who underwent ILP for MCC were analyzed. ILP was performed with melphalan and tumor necrosis factor (TNF) combination therapy...
August 3, 2017: European Journal of Surgical Oncology
https://www.readbyqxmd.com/read/28802537/psychosocial-reactions-to-upper-extremity-limb-salvage-a-cross-sectional-study
#14
Lindsay Sposato, Kathleen Yancosek, Josh Lospinoso, Jill Cancio
STUDY DESIGN: Descriptive cross-sectional survey study. INTRODUCTION: Limb salvage spares an extremity at risk for amputation after a major traumatic injury. Psychosocial recovery for individuals with lower extremity limb salvage has been discussed in the literature. However, to date, psychosocial reactions for individuals with upper extremity (UE) limb salvage have not been examined. PURPOSE OF THE STUDY: To determine which factors may influence psychosocial adaptation to UE limb salvage...
August 9, 2017: Journal of Hand Therapy: Official Journal of the American Society of Hand Therapists
https://www.readbyqxmd.com/read/28802220/comparison-of-lower-limb-muscle-strength-between-diabetic-neuropathic-and-healthy-subjects-using-opensim
#15
Alessandra Scarton, Ilse Jonkers, Annamaria Guiotto, Fabiola Spolaor, Gabriella Guarneri, Angelo Avogaro, Claudio Cobelli, Zimi Sawacha
Diabetes neuropathy and vasculopathy are the two major complications of diabetes mellitus, leading to diabetic foot disease, of which the worst consequences are plantar ulcers and amputations. Motor impairments like joint stiffness and loss of balance are distinctive effects of diabetes and they have been extensively explored. However, while altered muscle function has been also assessed through experimentally measured surface electromyography, little is known about muscle forces. The objective of this study was to estimate muscle forces in subjects with diabetes and to use these data to identify differences with respect to a population of healthy subjects matched for age and BMI...
July 31, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28799990/state-of-the-art-amputation-and-prosthetics
#16
David E Westberry
Amputation is not a defeat or failure of treatment, but an effective management strategy for certain conditions in the pediatric population. The principles of management, especially in the pediatric population, have not changed. Current surgical strategies focus on providing an optimal residual limb for prosthetic fitting. New technology provides improvement in the design and fabrication of prosthetic devices.
September 2017: Journal of Pediatric Orthopedics
https://www.readbyqxmd.com/read/28799724/characteristics-and-clinical-outcomes-of-repeat-endovascular-therapy-after-infrapopliteal-balloon-angioplasty-in-patients-with-critical-limb-ischemia
#17
Norihiro Kobayashi, Keisuke Hirano, Masahiro Yamawaki, Motoharu Araki, Tsuyoshi Sakai, Yasunari Sakamoto, Shinsuke Mori, Masakazu Tsutsumi, Yohsuke Honda, Takahiro Tokuda, Kenji Makino, Shigemitsu Shirai, Yoshiaki Ito
OBJECTIVES: We clarified characteristics and clinical outcomes of critical limb ischemia (CLI) patients who underwent repeat endovascular therapy (EVT) for infrapopliteal lesions. BACKGROUND: High restenosis rate after infrapopliteal EVT remains a major concern. METHODS: Patients with CLI who underwent EVT between April 2007 and February 2014, were divided into the following three groups according to how often EVT was repeated: Group A, no repeat of EVT; Group B, EVT repeated once/twice; and Group C, EVT repeated ≥3 times...
August 11, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28797673/trunk-kinetic-effort-during-step-ascent-and-descent-in-patients-with-transtibial-amputation-using-angular-momentum-separation
#18
Brecca M M Gaffney, Cory L Christiansen, Amanda M Murray, Bradley S Davidson
BACKGROUND: Patients with transtibial amputation adopt trunk movement compensations that alter effort and increase the risk of developing low back pain. However, the effort required to achieve high-demand tasks, such as step ascent and descent, remains unknown. METHODS: Kinematics were collected during bilateral step ascent and descent tasks from two groups: 1) seven patients with unilateral transtibial amputation and 2) seven healthy control subjects. Trunk kinetic effort was quantified using translational and rotational segmental moments (time rate of change of segmental angular momentum)...
July 29, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28797662/amputation-rates-mortality-and-pre-operative-comorbidities-in-patients-revascularised-for-intermittent-claudication-or-critical-limb-ischaemia-a-population-based-study
#19
E Baubeta Fridh, M Andersson, M Thuresson, B Sigvant, B Kragsterman, S Johansson, P Hasvold, M Falkenberg, J Nordanstig
OBJECTIVES: The aims of this population based study were to describe mid- to long-term amputation risk, cumulative incidence of death or amputation, and differences in pre-operative comorbidities in patients revascularised for lower limb peripheral artery disease (PAD). METHODS: This was an observational cohort study. Data from the Swedish National Quality Registry for Vascular Surgery (Swedvasc) were combined with mandatory national health care registries and patient medical records...
August 7, 2017: European Journal of Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/28795888/effective-wound-bed-preparation-using-maggot-debridement-therapy-for-patients-with-critical-limb-ischaemia
#20
A Nishijima, M Gosho, R Yoshida, S Yanagibayashi, M Takikawa, J Nishijima, M Sekido, N Yamamoto
OBJECTIVE: Patients with critical limb ischaemia (CLI) lack sufficient blood flow in to the limb, which leads to difficulties in the normal wound healing process. Therefore, maggot debridement therapy (MDT) has not generally been recommended for CLI patients. We evaluated the effectiveness of wound bed preparation by MDT in CLI patients who had undergone mid-foot amputation. METHODS: Patients who underwent mid-foot amputation after angioplasty between April 2014 and October 2016 were retrospectively investigated by classifying them into an MDT group or a conventional treatment group...
August 2, 2017: Journal of Wound Care
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