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https://www.readbyqxmd.com/read/29322812/adjustment-to-finger-amputation-and-silicone-finger-prosthesis-use
#1
Zala Kuret, Helena Burger, Gaj Vidmar, Tomaz Maver
PURPOSE: Finger amputations are the most common amputations of upper limbs. They influence hand function, general functioning and quality of life. One of the possibilities for rehabilitation after finger amputation is fitting a silicone finger prosthesis. We wanted to evaluate the adjustment to amputation and prosthesis use in patients after finger amputation. METHODS: We included 42 patients with partial or complete single or multiple finger amputation of one hand who visited the outpatient clinic for prosthetics and orthotics at our institute and received a silicone prosthesis...
January 11, 2018: Disability and Rehabilitation
https://www.readbyqxmd.com/read/29298304/the-vienna-psychosocial-assessment-procedure-for-bionic-reconstruction-in-patients-with-global-brachial-plexus-injuries
#2
Laura Antonia Hruby, Anna Pittermann, Agnes Sturma, Oskar Christian Aszmann
BACKGROUND: Global brachial plexopathies cause major sensory and motor deficits in the affected arm and hand. Many patients report of psychosocial consequences including chronic pain, decreased self-sufficiency, and poor body image. Bionic reconstruction, which includes the amputation and prosthetic replacement of the functionless limb, has been shown to restore hand function in patients where classic reconstructions have failed. Patient selection and psychological evaluation before such a life-changing procedure are crucial for optimal functional outcomes...
2018: PloS One
https://www.readbyqxmd.com/read/29288558/aggressive-infrainguinal-revascularization-in-renal-transplant-patients-is-justifiable
#3
Rebecca Craig-Schapiro, Besma Nejim, Isibor Arhuidese, Mahmoud B Malas
While studies demonstrate poor outcomes of lower extremity revascularization in end-stage renal disease patients, little is known about results in renal transplant patients. We analyzed 2-year primary patency and limb salvage outcomes and associated risk factors of transplant (N=202) and non-transplant patients (N=25,274) in the Vascular Quality Initiative database undergoing infrainguinal bypass from 2003-2016. Multivariable Cox regression analysis and coarsened exact matching with many-to-one were employed...
December 29, 2017: American Journal of Transplantation
https://www.readbyqxmd.com/read/29276850/maintaining-stable-transfemoral-amputee-gait-on-level-sloped-and-simulated-uneven-conditions-in-a-virtual-environment
#4
James A Sturk, Edward D Lemaire, Emily H Sinitski, Nancy L Dudek, Markus Besemann, Jacqueline S Hebert, Natalie Baddour
PURPOSE: Describe and quantify how people with transfemoral amputations (TFA) maintain stable gait over a variety of surfaces; including, downhill and uphill, top and bottom-cross-slopes, medial-lateral translations, rolling hills and simulated rocky surfaces. METHODS: Ten TFA and ten matched people without amputations (NA) walked in a virtual environment with level, sloped and simulated uneven surfaces on a self-paced treadmill. Stability was quantified using medial-lateral margin of stability (ML-MoS), step parameters, and gait variability (standard deviations for speed, temporal-spatial parameters, foot clearance and root-mean-square of medial-lateral trunk acceleration)...
December 24, 2017: Disability and Rehabilitation. Assistive Technology
https://www.readbyqxmd.com/read/29276108/sex-based-outcomes-of-lower-extremity-bypass-surgery-in-hemodialysis-patients
#5
Isibor Arhuidese, Amber Kernodle, Besma Nejim, Satinderjit Locham, Caitlin Hicks, Mahmoud B Malas
OBJECTIVE: The objective of this study was to compare conduit use and surgical outcomes of hemodialysis-dependent men and women after open lower extremity bypass surgery. METHODS: Using the United States Renal Data System, we studied all hemodialysis patients in the United States who underwent infrainguinal bypass surgery between January 1, 2006, and December 31, 2011. Univariate methods (χ2, analysis of variance) were employed to compare patient and bypass characteristics between men and women...
December 21, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/29249656/brain-computer-interface-with-inhibitory-neurons-reveals-subtype-specific-strategies
#6
Akinori Mitani, Mingyuan Dong, Takaki Komiyama
Brain-computer interfaces have seen an increase in popularity due to their potential for direct neuroprosthetic applications for amputees and disabled individuals. Supporting this promise, animals-including humans-can learn even arbitrary mapping between the activity of cortical neurons and movement of prosthetic devices [1-4]. However, the performance of neuroprosthetic device control has been nowhere near that of limb control in healthy individuals, presenting a dire need to improve the performance. One potential limitation is the fact that previous work has not distinguished diverse cell types in the neocortex, even though different cell types possess distinct functions in cortical computations [5-7] and likely distinct capacities to control brain-computer interfaces...
December 5, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/29241330/ultrasensitive-and-highly-stable-resistive-pressure-sensors-with-biomaterial-incorporated-interfacial-layers-for-wearable-health-monitoring-and-human-machine-interfaces
#7
Hochan Chang, Sungwoong Kim, Sumin Jin, Seung-Woo Lee, Gil-Tae Yang, Ki-Young Lee, Hyunjung Yi
Flexible piezoresistive sensors have huge potential for health-monitoring, human-machine interfaces, prosthetic limbs and intelligent robotics. A variety of nanomaterials and structural schemes have been proposed for realizing ultrasensitive flexible piezoresistive sensors. However, despite success of recent efforts, the high sensitivity within narrower pressure ranges and/or the challenging adhesion and stability issues still potentially limit their broad applications. Herein, we introduce a biomaterial-based scheme for the development of flexible pressure sensors that are ultrasensitive (resistance change by five orders) over broad pressure ranges of 0...
December 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29235055/a-finite-element-model-to-assess-transtibial-prosthetic-sockets-with-elastomeric-liners
#8
John C Cagle, Per G Reinhall, Kate J Allyn, Jake McLean, Paul Hinrichs, Brian J Hafner, Joan E Sanders
People with transtibial amputation often experience skin breakdown due to the pressures and shear stresses that occur at the limb-socket interface. The purpose of this research was to create a transtibial finite element model (FEM) of a contemporary prosthesis that included complete socket geometry, two frictional interactions (limb-liner and liner-socket), and an elastomeric liner. Magnetic resonance imaging scans from three people with characteristic transtibial limb shapes (i.e., short-conical, long-conical, and cylindrical) were acquired and used to develop the models...
December 13, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29232751/-prosthetics-and-orthotics-prosthetic-fitting-in-lower-extremity-in-transfemoral-amputation
#9
Bernhard Greitemann
Modern prosthetic equipment often enables reintegration of patients with the amputation of a lower limb into their private life, their professional and social environment to a large extent. Provisioning of the lower extremity with artificial limbs aims at a life as normal as possible for the involved individual. The modules are selected in an interdisciplinary team. An optimal fitting of the socket, the correct static set-up, the appropriate fitting as well as cosmetic aspects are the essential basis for a sufficient provisioning...
December 2017: Zeitschrift Für Orthopädie und Unfallchirurgie
https://www.readbyqxmd.com/read/29229405/instrumented-socket-inserts-for-sensing-interaction-at-the-limb-socket-interface
#10
Eric C Swanson, Jake B McLean, Katheryn J Allyn, Christian B Redd, Joan E Sanders
The objective of this research was to investigate a strategy for designing and fabricating computer-manufactured socket inserts that were embedded with sensors for field monitoring of limb-socket interactions of prosthetic users. An instrumented insert was fabricated for a single trans-tibial prosthesis user that contained three sensor types (proximity sensor, force sensing resistor, and inductive sensor), and the system was evaluated through a sequence of laboratory clinical tests and two days of field use...
December 8, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/29217449/role-of-brachial-artery-ligation-in-management-of-prosthetic-arteriovenous-graft-infections
#11
Chandrashekar A R, Chetan R Hoskatti, Sanjay C Desai, Rajendra B Prasad
BACKGROUND: Arteriovenous graft (AVG) infections can present as major life-threatening hemorrhage or sepsis in a chronic kidney disease patient. Frequently, all these patients present in critical condition which need prompt and expeditious management. Various procedures are described for management of infected grafts and its bleeding complications. However, these procedures are associated with postop-operative bleeding and persistent infection. The aim was to study brachial artery ligation (BAL) near the elbow joint in the management of an infected AVG...
December 5, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/29215082/the-myokinetic-control-interface-tracking-implanted-magnets-as-a-means-for-prosthetic-control
#12
S Tarantino, F Clemente, D Barone, M Controzzi, C Cipriani
Upper limb amputation deprives individuals of their innate ability to manipulate objects. Such disability can be restored with a robotic prosthesis linked to the brain by a human-machine interface (HMI) capable of decoding voluntary intentions, and sending motor commands to the prosthesis. Clinical or research HMIs rely on the interpretation of electrophysiological signals recorded from the muscles. However, the quest for an HMI that allows for arbitrary and physiologically appropriate control of dexterous prostheses, is far from being completed...
December 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29209023/motor-cortical-activity-changes-during-neuroprosthetic-controlled-object-interaction
#13
John E Downey, Lucas Brane, Robert A Gaunt, Elizabeth C Tyler-Kabara, Michael L Boninger, Jennifer L Collinger
Brain-computer interface (BCI) controlled prosthetic arms are being developed to restore function to people with upper-limb paralysis. This work provides an opportunity to analyze human cortical activity during complex tasks. Previously we observed that BCI control became more difficult during interactions with objects, although we did not quantify the neural origins of this phenomena. Here, we investigated how motor cortical activity changed in the presence of an object independently of the kinematics that were being generated using intracortical recordings from two people with tetraplegia...
December 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29201828/hand-functions-of-myoelectric-and-3d-printed-pressure-sensored-prosthetics-a-comparative-study
#14
Kyu Ho Lee, Hobeom Bin, KeunBae Kim, So Young Ahn, Bong-Ok Kim, Soo-Kyung Bok
The loss of an upper limb significantly limits the functional activities of daily living. A huge emphasis is placed on the manipulation, shape, weight, and comfort of a prosthesis, to enable its use as an inherent body part. Even with technological advances, customized upper-extremity myoelectric prosthesis remain heavy and expensive. The high cost of upper-extremity prosthesis is an especially steep economic barrier for patients. Three-dimensional (3D) printing is a promising avenue for reducing the cost of prosthesis...
October 2017: Annals of Rehabilitation Medicine
https://www.readbyqxmd.com/read/29190727/influence-of-the-type-of-training-task-on-intermanual-transfer-effects-in-upper-limb-prosthesis-training-a-randomized-pre-posttest-study
#15
Sietske Romkema, Raoul M Bongers, Corry K van der Sluis
Intermanual transfer, the transfer of motor skills from the trained hand to the untrained hand, can be used to train upper limb prosthesis skills. The aim of this study was to determine the relation between the magnitude of the intermanual transfer effect and the type of training task. The used tasks were based on different aspects of prosthetic handling: reaching, grasping, grip-force production and functional tasks. A single-blinded clinical trial, with a pre-posttest design was executed. Seventy-one able-bodied, right-handed participants were randomly assigned to four training and two control groups...
2017: PloS One
https://www.readbyqxmd.com/read/29189099/creative-prosthetic-foot-selection-enables-successful-ambulation-in-stiletto-high-heels
#16
Elizabeth Russell Esposito, Delbert H Lipe, Christopher A Rábago
BACKGROUND: Walking in high heels presents biomechanical challenges, yet they remain part of many women's attire. However, women with a lower limb amputation are limited in available footwear options. Case description and methods: This case study is in response to one patient's assertion that she walked better and more symmetrically in heels than flat shoes with her below-knee prosthesis. She underwent gait analysis in athletic shoes and 10-cm stiletto high heels worn with a pediatric running foot to determine if these claims could be substantiated through biomechanical measures...
November 1, 2017: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/29188681/targeted-muscle-reinnervation-for-improved-control-of-myoelectric-upper-limb-prostheses
#17
G Vadalà, G Di Pino, L Ambrosio, L Diaz Balzani, V Denaro
Targeted muscle reinnervation (TMR) is a novel surgical technique developed to improve the control of myoelectric upper limb prostheses. Nerves transected by the amputation, which retain their original motor pathways even after being severed, are redirected to residual denervated muscles that serve as target for consequent reinnervation. Once the process is complete, reinnervated muscles will contract upon voluntary activation of transferred nerves while attempting to move missing regions of the amputated limb, generating EMG signals that can be recorded and used to control a prosthetic device...
October 2017: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/29187203/softhand-at-the-cybathlon-a-user-s-experience
#18
Sasha Blue Godfrey, Matteo Rossi, Cristina Piazza, Manuel Giuseppe Catalano, Matteo Bianchi, Giorgio Grioli, Kristin D Zhao, Antonio Bicchi
BACKGROUND: Roughly one-quarter of upper limb prosthesis users reject their prosthesis. Reasons for rejection range from comfort, to cost, aesthetics, function, and more. This paper follows a single user from training with and testing of a novel upper-limb myoelectric prosthesis (the SoftHand Pro) for participation in the CYBATHLON rehearsal to training for and competing in the CYBATHLON 2016 with a figure-of-nine harness controlled powered prosthesis (SoftHand Pro-H) to explore the feasibility and usability of a flexible anthropomorphic prosthetic hand...
November 29, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/29185295/complications-and-survival-of-megaprostheses-after-resection-of-bone-metastases
#19
M De Gori, A D’Arienzo, L Andreani, G Beltrami, D A Campanacci, P De Biase, F Frenos, S Giannotti, F Sacchetti, F Totti, P Parchi, R Capanna
Treatment of bone metastases is often palliative, aiming at pain control and stabilization or prevention of pathological fractures. However, a complete resection with healing purposes can be performed in selected cases. The aim of our work was to evaluate the survival of megaprostheses used for reconstruction after bone metastases. Between January 2001 and March 2015, we implanted 169 Megasystem-C® (Waldemar LINK® GmbH & Co. KG, Hamburg, Germany) after bone metastasis resection. Patients, 95 females and 74 males, were operated at an average age of 61 (12-87) years for proximal femoral resection in 135 (79...
October 2017: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/29184493/step-to-step-ankle-inversion-eversion-torque-modulation-can-reduce-effort-associated-with-balance
#20
Myunghee Kim, Steven H Collins
Below-knee amputation is associated with higher energy expenditure during walking, partially due to difficulty maintaining balance. We previously found that once-per-step push-off work control can reduce balance-related effort, both in simulation and in experiments with human participants. Simulations also suggested that changing ankle inversion/eversion torque on each step, in response to changes in body state, could assist with balance. In this study, we investigated the effects of ankle inversion/eversion torque modulation on balance-related effort among amputees (N = 5) using a multi-actuated ankle-foot prosthesis emulator...
2017: Frontiers in Neurorobotics
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