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Linda Resnik, He Helen Huang, Anna Winslow, Dustin L Crouch, Fan Zhang, Nancy Wolk
BACKGROUND: Although electromyogram (EMG) pattern recognition (PR) for multifunctional upper limb prosthesis control has been reported for decades, the clinical benefits have rarely been examined. The study purposes were to: 1) compare self-report and performance outcomes of a transradial amputee immediately after training and one week after training of direct myoelectric control and EMG pattern recognition (PR) for a two-degree-of-freedom (DOF) prosthesis, and 2) examine the change in outcomes one week after pattern recognition training and the rate of skill acquisition in two subjects with transradial amputations...
March 15, 2018: Journal of Neuroengineering and Rehabilitation
Paul D Marasco, Jacqueline S Hebert, Jon W Sensinger, Courtney E Shell, Jonathon S Schofield, Zachary C Thumser, Raviraj Nataraj, Dylan T Beckler, Michael R Dawson, Dan H Blustein, Satinder Gill, Brett D Mensh, Rafael Granja-Vazquez, Madeline D Newcomb, Jason P Carey, Beth M Orzell
To effortlessly complete an intentional movement, the brain needs feedback from the body regarding the movement's progress. This largely nonconscious kinesthetic sense helps the brain to learn relationships between motor commands and outcomes to correct movement errors. Prosthetic systems for restoring function have predominantly focused on controlling motorized joint movement. Without the kinesthetic sense, however, these devices do not become intuitively controllable. We report a method for endowing human amputees with a kinesthetic perception of dexterous robotic hands...
March 14, 2018: Science Translational Medicine
Ivan Vujaklija, Vahid Shalchyan, Ernest N Kamavuako, Ning Jiang, Hamid R Marateb, Dario Farina
BACKGROUND: In this paper, we propose a nonlinear minimally supervised method based on autoencoding (AEN) of EMG for myocontrol. The proposed method was tested against the state-of-the-art (SOA) control scheme using a Fitts' law approach. METHODS: Seven able-bodied subjects performed a series of target acquisition myoelectric control tasks using the AEN and SOA algorithms for controlling two degrees-of-freedom (radial/ulnar deviation and flexion/extension of the wrist), and their online performance was characterized by six metrics...
March 13, 2018: Journal of Neuroengineering and Rehabilitation
Fiona M Z van den Heiligenberg, Tanya Orlov, Scott N Macdonald, Eugene P Duff, David Henderson Slater, Christian F Beckmann, Heidi Johansen-Berg, Jody C Culham, Tamar R Makin
The human brain contains multiple hand-selective areas, in both the sensorimotor and visual systems. Could our brain repurpose neural resources, originally developed for supporting hand function, to represent and control artificial limbs? We studied individuals with congenital or acquired hand-loss (hereafter one-handers) using functional MRI. We show that the more one-handers use an artificial limb (prosthesis) in their everyday life, the stronger visual hand-selective areas in the lateral occipitotemporal cortex respond to prosthesis images...
March 9, 2018: Brain: a Journal of Neurology
Michael S Pinzur
No abstract text is available yet for this article.
March 9, 2018: Clinical Orthopaedics and related Research
A I Mirulla, L Bragonzoni, S Zaffagnini, M Bontempi, V Nigrelli, T Ingrassia
INTRODUCTION: Traditional prosthetic solutions expose the amputee to numerous problems that limit his ability to safely perform the normal activities of daily life. In order to eliminate the problems related to the use of the traditional prosthesis with socket, a new technique was developed for fixing the prosthesis to the amputees based on the principle of osseointegration. The aim of this paper is to study and analyze the stress distribution on the interface between a trans-humeral osseointegrated prosthetic implant and the residual bone, identifying the most stressed areas and thus foreseeing possible failure phenomena of the entire prosthetic system and, after, to compare the stress distribution on three different prosthetic designs that differ from each other for some geometric characteristics...
March 7, 2018: Injury
Bo Geng, Jian Dong, Winnie Jensen, Strahinja Dosen, Dario Farina, Ernest Nlandu Kamavuako
This paper evaluated the psychophysical properties of subdermal electrical stimulation to investigate its feasibility in providing sensory feedback for limb prostheses. The detection threshold (DT), pain threshold (PT), just noticeable difference (JND), as well as the elicited sensation quality, comfort, intensity, and location were assessed in 16 healthy volunteers during stimulation of the ventral and dorsal forearm with subdermal electrodes. Moreover, the results were compared with those obtained from transcutaneous electrical stimulation...
March 2018: IEEE Transactions on Neural Systems and Rehabilitation Engineering
Kai Xu, Huan Liu, Zhaoyu Zhang, Xiangyang Zhu
Among the advances in upper extremity prostheses in the past decades, only a small portion of the results were obtained for partial hand prostheses, possibly due to the highly diverse partial hand presentations and limited space for component integration. In an attempt to address these challenges, this paper presents the design, construction, installation, and experimental characterization of a wrist-powered partial hand prosthesis developed in Shanghai Jiao Tong University (hereafter referred to as the JTP hand), customized for a specific amputee...
March 2018: IEEE Transactions on Neural Systems and Rehabilitation Engineering
Elisabetta Ambron, Alexander Miller, Katherine J Kuchenbecker, Laurel J Buxbaum, H Branch Coslett
Up to 90% of amputees experience sensations in their phantom limb, often including strong, persistent phantom limb pain (PLP). Standard treatments do not provide relief for the majority of people who experience PLP, but virtual reality (VR) has shown promise. This study provides additional evidence that game-like training with low-cost immersive VR activities can reduce PLP in lower-limb amputees. The user of our system views a real-time rendering of two intact legs in a head-mounted display while playing a set of custom games...
2018: Frontiers in Neurology
Mostafa Allami, Amir Yavari, Amir Karimi, Mehdi Masoumi, Mohammadreza Soroush, Elahe Faraji
BACKGROUND: The ankle-foot injuries are among the war-related injuries that cause many serious secondary problems for a lifetime. This nationwide study aimed to assess health-related quality of life and the ability to perform activities of daily living in veterans with ankle-foot injuries due to the Iran-Iraq war. METHODS: A total of 1079 veterans with ankle-foot injuries were enrolled in a cross-sectional study from 2014 to 2016. Demographic characteristics, including age, gender, marital status, disability percent, educational level, employment and additional injuries, were collected...
November 29, 2017: Military Medical Research
Shashikumar Ramadugu, Satish C Nagabushnam, Nagendra Katuwal, Kaushik Chatterjee
Introduction: Mirror therapy suggested to help relieve phantom limb pain (PLP) by resolving the visual- proprioceptive dissociation in the brain, but studies so far either had shorter follow-up or smaller sample size. Materials and Methods: In this randomized single crossover trial, 64 amputees with PLP in the age group of 15-75 years of age were distributed into test and control groups by simple randomization method. Of these 28 in control and 32 in test groups, respectively, completed the 4 weeks of mirror therapy and 12 weeks of follow-up assessments...
October 2017: Indian Journal of Psychiatry
Jesse A Columbo, Louise Davies, Ravinder Kang, J Aaron Barnes, Kathleen A Leinweber, Bjoern D Suckow, Philip P Goodney, David H Stone
OBJECTIVES: To date, studies of vascular amputees primarily examine quantitative outcomes following limb loss. Less is known about the patient's perspective after major lower limb amputation. Here, we define and describe the postamputation recovery period. METHODS: Qualitative study using purposive, maximum variation sampling on the variables of amputation level and times since surgery. We first conducted structured interviews with 20 participants (median age: 65 years, range: 45-88 years; 85% male; below knee amputation n = 14; above knee amputation n = 6; median time from amputation to interview = 16 months, range: 4-51 months)...
January 1, 2018: Vascular and Endovascular Surgery
Srinivas Pandit, Anoop Kant Godiyal, Amit Kumar Vimal, Upinderpal Singh, Deepak Joshi, Dinesh Kalyanasundaram
This paper proposes a novel and an affordable lower limb prosthesis to enable normal gait kinematics for trans-femoral amputees. The paper details the design of a passive prosthesis with magneto-rheological (MR) damping system and electronic control. A new control approach based on plantar insole feedback was employed here. Strategically placed sensors on the plantar insole provide required information about gait cycle to a finite state controller for suitable action. A proportional integral (PI) based current controller controls the required current for necessary damping during gait...
February 27, 2018: Sensors
Uwe Wollina, Birgit Heinig, Georgi Tchernev, Katlein França, Torello Lotti
Leg amputees who can't use prostheses and patients with arthritis are often dependent on crutches. Their chronic use can exert significant friction forces. The palmar skin will respond by forming a hyperkeratotic callus. We report for the first time unilateral palmar callus formation caused by friction from using crutches. Another possible adverse effect is the triggering of irritant contact dermatitis by the handholes of crutches. We report two cases with hand dermatitis due to the chronic dependence on crutches and discuss treatment options...
January 25, 2018: Open Access Macedonian Journal of Medical Sciences
Francesca Garbarini, Ambra Bisio, Monica Biggio, Lorenzo Pia, Marco Bove
Amputees with phantom limb sometimes report vivid experiences of moving their phantom. Is phantom movement only "imaginary", or, instead, it has physiological properties comparable to those pertaining to real movements? To answer this question, we took advantage of the intermanual transfer of sequence learning, occurring when one hand motor skills improve after training with the other hand. Ten healthy controls and two upper-limb amputees (with and without phantom-movement) were recruited. They were asked to perform with the right (intact) hand a fingers-thumb opposition sequence either in Naïve condition or after an active (Real condition) or a mental (Imagery condition) training with the left (phantom) hand...
February 6, 2018: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
Sellaiah Sooriakumaran, Maggie Uden, Sarah Mulroy, David Ewins, Thomas Collins
BACKGROUND: Substantial improvements have been perceived in surgical results following major lower limb amputation, but there remains observed variation in amputation quality for patients referred for prosthetic rehabilitation from different hospitals. OBJECTIVES: To assess various elements that influence residual limb quality and evaluate their impact on progress through initial prosthetic rehabilitation and mobility outcome after rehabilitation. STUDY DESIGN: Clinical survey...
February 1, 2018: Prosthetics and Orthotics International
Sophie Wang, Janice Hsu, Lauren Trent, Tiffany Ryan, Nathan Kearns, Eugene Civillico, Kimberly Kontson
Objective performance-based outcome measures (OMs) have the potential to provide unbiased and reproducible assessments of limb function. However, very few of these performance-based OMs have been validated for upper limb (UL) prosthesis users. OMs validated in other clinical populations (e.g. neurological or musculoskeletal conditions) could be used to fill gaps in existing performance-based OMs for UL amputees. Additionally, a joint review might reveal consistent gaps across multiple clinical populations. Therefore, the objective of this review was to systematically characterize prominent measures utilized in both sets of clinical populations with regard to (1) location of task performance around the body, (2) possible grips employed, (3) bilateral vs...
February 20, 2018: PM & R: the Journal of Injury, Function, and Rehabilitation
Farzaneh Ahmadi, Farzad Noorian, Daniel Novakovic, André van Schaik
Despite emergent progress in many fields of bionics, a functional Bionic Voice prosthesis for laryngectomy patients (larynx amputees) has not yet been achieved, leading to a lifetime of vocal disability for these patients. This study introduces a novel framework of Pneumatic Bionic Voice Prostheses as an electronic adaptation of the Pneumatic Artificial Larynx (PAL) device. The PAL is a non-invasive mechanical voice source, driven exclusively by respiration with an exceptionally high voice quality, comparable to the existing gold standard of Tracheoesophageal (TE) voice prosthesis...
2018: PloS One
Todd A Kuiken, Nicholas P Fey, Timothy Reissman, Suzanne B Finucane, Gregory A Dumanian
Background: Excess residual limb fat is a common problem that can impair prosthesis control and negatively impact gait. In the general population, thighplasty and liposuction are commonly performed for cosmetic reasons but not specifically to improve function in amputees. The objective of this study was to determine if these procedures could enhance prosthesis fit and function in an overweight above-knee amputee. Methods: We evaluated the use of these techniques on a 50-year-old transfemoral amputee who was overweight...
January 2018: Plastic and Reconstructive Surgery. Global Open
Susan W Hunter, Courtney Frengopoulos, Jeffrey Holmes, Ricardo Viana, Michael W C Payne
BACKGROUND: The improvement of gait and mobility are major rehabilitation goals following lower extremity amputations. However, when living in the community many daily activities require the multitasking of motor and cognitive tasks. The dual-task paradigm can be used to evaluate the concurrent performance of mobility and cognitive tasks. RESEARCH QUESTION: The purpose of this study was to evaluate the effects of dual-task gait testing in older adults with trans-tibial amputations...
February 13, 2018: Gait & Posture
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