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Limb prosthesis

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https://www.readbyqxmd.com/read/28438166/adjacent-regenerative-peripheral-nerve-interfaces-produce-phase-antagonist-signals-during-voluntary-walking-in-rats
#1
Daniel Ursu, Andrej Nedic, Melanie Urbanchek, Paul Cederna, R Brent Gillespie
BACKGROUND: Regenerative Peripheral Nerve Interfaces (RPNIs) are neurotized muscle grafts intended to produce electromyographic signals suitable for motorized prosthesis control. Two RPNIs producing independent agonist/antagonist signals are required for each control axis; however, it is unknown whether signals from adjacent RPNIs are independent. The purpose of this work was to determine signaling characteristics from two adjacent RPNIs, the first neurotized by a foot dorsi-flexor nerve and the second neurotized by a foot plantar-flexor nerve in a rodent model...
April 24, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28436378/outcomes-of-corpectomy-in-patients-with-metastatic-cancer
#2
Grzegorz Guzik
BACKGROUND: The objective of surgical management of spinal metastases is to reduce pain and improve the patient's quality of life. The operation should restore spinal stability and decompress neural structures. One surgical technique is corpectomy followed by vertebral body reconstruction and stabilisation of the spine. The procedure may be performed in patients in overall good health and a good survival prognosis. The aim of this paper is to present the outcomes of surgical management of spinal metastases in patients who underwent corpectomy followed by vertebral body reconstruction and stabilisation of the spine...
January 26, 2017: Ortopedia, Traumatologia, Rehabilitacja
https://www.readbyqxmd.com/read/28434280/use-of-a-custom-made-limb-press-model-to-assess-intra-and-extracapsular-techniques-for-treating-cranial-cruciate-ligament-rupture-in-cats
#3
Wolfgang Kneifel, Danilo Borak, Barbara Bockstahler, Eva Schnabl-Feichter
Objectives This study aimed to compare the under-and-over technique, a type of intracapsular treatment, and the standard fabella-tibial suture, a method for extracapsular treatment, in achieving immediate, postoperative stifle stability after cranial cruciate ligament (CrCL) rupture by using a feline, custom-made limb-press model. Methods Cadaveric feline hindlimb specimens (n = 14) were positioned in the limb press at predefined joint angles (stifle joint: 120°; hock joint: 120°), and vertical loads of 5%, 10%, 20% and 30% body weight were applied statically...
April 1, 2017: Journal of Feline Medicine and Surgery
https://www.readbyqxmd.com/read/28420135/a-prosthetic-hand-body-area-controller-based-on-efficient-pattern-recognition-control-strategies
#4
Simone Benatti, Bojan Milosevic, Elisabetta Farella, Emanuele Gruppioni, Luca Benini
Poliarticulated prosthetic hands represent a powerful tool to restore functionality and improve quality of life for upper limb amputees. Such devices offer, on the same wearable node, sensing and actuation capabilities, which are not equally supported by natural interaction and control strategies. The control in state-of-the-art solutions is still performed mainly through complex encoding of gestures in bursts of contractions of the residual forearm muscles, resulting in a non-intuitive Human-Machine Interface (HMI)...
April 15, 2017: Sensors
https://www.readbyqxmd.com/read/28409131/hip-disarticulation-case-series-analysis-and-literature-review
#5
Diogo Lino Moura, António Garruço
OBJECTIVE: To present a retrospective study of 16 patients submitted to hip disarticulation. METHODS: During the period of 16 years, 16 patients who underwent hip disarticulation were identified. All of them were studied based on clinical records regarding the gender, age at surgery, disarticulation cause, postoperative complications, mortality rates and functional status after hip disarticulation. RESULTS: Hip disarticulation was performed electively in most cases and urgently in only three cases...
March 2017: Revista Brasileira de Ortopedia
https://www.readbyqxmd.com/read/28400204/computed-navigated-total-knee-arthroplasty-compared-to-computed-tomography-scans
#6
Ron Batash, Guy Rubin, Alexander Lerner, Hussein Shehade, Nimrod Rozen, David E Rothem
BACKGROUND: Successful total knee arthroplasty (TKA) includes accurate alignment. Controversy remains as to whether computer-navigated TKA improves the overall result and clinical outcome. Our aim is to compare the limb alignment and prosthesis positioning according to the pre- and postoperative computed tomography (CT) scans with the data collected from the navigation system. METHODS: We compared the pre- and postoperative limb alignments and prosthesis alignment provided by the Orthopilot navigation system, Aesculap®, with CT scans measured by the Traumacad® software of 70 TKAs...
April 8, 2017: Knee
https://www.readbyqxmd.com/read/28398398/-new-technologies-and-applications-for-drug-coated-balloons
#7
Bernardo Cortese, Gaetano Di Palma, Roberto Nerla, Antonio Micari
Drug-eluting stents (DES) represent nowadays the gold standard treatment for coronary artery disease. Despite the safety and efficacy, and favorable long-term clinical outcomes of new generation DES, their use is still associated with a not negligible risk of long-term events, related to the presence of a definitive prosthesis in the vessel wall. In addition, DES implantation is not always desirable in particular anatomic settings (small vessels, bifurcations) or in patients with higher bleeding risk. In recent years, drug-coated balloons (DCB) have been developed to overcome some of these limitations, offering a combined mechanical (balloon dilation) and biological therapy (drug-release)...
February 2017: Giornale Italiano di Cardiologia
https://www.readbyqxmd.com/read/28397018/functional-capacity-evaluation-in-upper-limb-reduction-deficiency-and-amputation-development-and-pilot-testing
#8
S G Postema, R M Bongers, M F Reneman, C K van der Sluis
Purpose To develop and pilot test a functional capacity evaluation (FCE) for individuals with upper limb absence (ULA) due to reduction deficiency or amputation, and to examine the relationship between FCE results and presence of musculoskeletal complaints (MSC). Method Five tests (overhead lifting, overhead working, repetitive reaching, fingertip dexterity, and handgrip strength) were selected and adapted if necessary. The newly developed FCE, called FCE-One-Handed (FCE-OH), was pilot tested in 20 adults individuals with ULA, and 20 matched controls...
April 10, 2017: Journal of Occupational Rehabilitation
https://www.readbyqxmd.com/read/28396957/-transcutaneous-osseointegrated-prosthesis-top-after-limb-amputation-status-quo-and-perspectives
#9
Christian Willy, Christian Krettek
The majority of transfemoral and transtibial amputees can be functionally fitted with conventional suspension sockets; however, due to socket problems using conventional stump care, 60% of the patients have limited function and even in younger patients approximately one sixth are unable to wear the prosthesis daily. After the introduction of transcutaneous osseointegrated prostheses (TOP) the inherent problems of socket-stump care can be avoided for these patients. Against this background this article reviews the recent clinical development of TOP in Sweden, Germany, the Netherlands, Australia and USA currently in nine centers...
April 10, 2017: Der Unfallchirurg
https://www.readbyqxmd.com/read/28391518/discovery-elbow-system-clinical-and-radiological-results-after-2-to-10-year-follow-up
#10
Patrik Hänninen, Tuukka Niinimäki, Tapio Flinkkilä, Jaakko Niinimäki, Pasi Ohtonen, Susanna Yli-Luukko, Juhana Leppilahti
BACKGROUND: Discovery Elbow System (DES) is a semi-constrained prosthesis, mainly used for patients with rheumatoid arthritis (RA). METHODS: Records from 79 patients with RA (90 DES arthroplasties) were reviewed; 47 patients with 55 DES elbows were re-examined. Range of motion (ROM) of both elbows, upper limb function, and quality of life (Disabilities of the Arm, Shoulder, and Hand [DASH] score, Mayo Elbow Performance Score [MEPS], and the RAND 36-Item Health Survey [RAND-36]) were assessed...
April 8, 2017: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
https://www.readbyqxmd.com/read/28387657/the-importance-of-orthoses-on-activities-of-daily-living-in-patients-with-unilateral-lower-limb-amputations
#11
Sule Sahin Onat, Sibel Ünsal-Delialioğlu, Sumru Özel
BACKGROUND: The role of the selected prothesis on activities of daily living (ADL). OBJECTIVE: To evaluate the impact of prothesis on ADL in patients with lower-limb amputations. METHODS: The data of 500 patients with unilateral lower limb amputation were recorded. The activity level was defined based on the Medicare Functional Classification Level. Old and new prescribed prosthesis were recorded. Nottingham Extended Activities of daily living activities Daily Living Scale was used to evaluate ADL...
March 31, 2017: Journal of Back and Musculoskeletal Rehabilitation
https://www.readbyqxmd.com/read/28386211/on-the-auditory-proprioception-substitution-hypothesis-movement-sonification-in-two-deafferented-subjects-learning-to-write-new-characters
#12
Jérémy Danna, Jean-Luc Velay
The aim of this study was to evaluate the compensatory effects of real-time auditory feedback on two proprioceptively deafferented subjects. The real-time auditory feedback was based on a movement sonification approach, consisting of translating some movement variables into synthetic sounds to make them audible. The two deafferented subjects and 16 age-matched control participants were asked to learn four new characters. The characters were learned under two different conditions, one without sonification and one with sonification, respecting a within-subject protocol...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28384495/two-degrees-of-freedom-quasi-static-emg-force-at-the-wrist-using-a-minimum-number-of-electrodes
#13
Edward A Clancy, Carlos Martinez-Luna, Marek Wartenberg, Chenyun Dai, Todd R Farrell
Surface electromyogram-controlled powered hand/wrist prostheses return partial upper-limb function to limb-absent persons. Typically, one degree of freedom (DoF) is controlled at a time, with mode switching between DoFs. Recent research has explored using large-channel EMG systems to provide simultaneous, independent and proportional (SIP) control of two joints-but such systems are not practical in current commercial prostheses. Thus, we investigated site selection of a minimum number of conventional EMG electrodes in an EMG-force task, targeting four sites for a two DoF controller...
March 29, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28376828/all-polyethylene-tibial-components-in-distal-femur-limb-salvage-surgery-a-finite-element-analysis-based-on-promising-clinical-outcomes
#14
Fan Tang, Yong Zhou, Wenli Zhang, Li Min, Rui Shi, Yi Luo, Hong Duan, Chongqi Tu
BACKGROUND: Whether all-polyethylene tibial (APT) components are beneficial to patients who received distal femur limb-salvage surgery lacks high-quality clinical follow-up and mechanical evidence. This study aimed to investigate the biomechanics of the distal femur reconstructed with APT tumor knee prostheses using finite element (FE) analysis based on our previous, promising clinical outcome. METHODS: Three-dimensional FE models that use APT and metal-backed tibial (MBT) prostheses to reconstruct distal femoral bone defects were developed and input into the Abaqus FEA software version 6...
April 4, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/28375687/predictors-of-retention-and-attrition-in-a-study-of-an-advanced-upper-limb-prosthesis-implications-for-adoption-of-the-deka-arm
#15
Linda Resnik, Jill Cancio, Shana Klinger, Gail Latlief, Nicole Sasson, Lisa Smurr-Walters
PURPOSE: The purpose was to identify factors associated with completion of the VA home study of the DEKA Arm. Design and methodological procedures used: Differences between groups were examined using chi-square and t-tests. A multivariable logistic regression model predicting completion was generated and odds ratios (OR) for significant variables calculated. Post-hoc analysis was performed to plot the receiver operating characteristics (ROC) curve. RESULTS: Participants who completed were more likely to be prosthesis users at study onset (p = ...
April 4, 2017: Disability and Rehabilitation. Assistive Technology
https://www.readbyqxmd.com/read/28373013/effects-of-socket-size-on-metrics-of-socket-fit-in-trans-tibial-prosthesis-users
#16
Joan E Sanders, Robert T Youngblood, Brian J Hafner, John C Cagle, Jake B McLean, Christian B Redd, Colin R Dietrich, Marcia A Ciol, Katheryn J Allyn
The purpose of this research was to conduct a preliminary effort to identify quantitative metrics to distinguish a good socket from an oversized socket in people with trans-tibial amputation. Results could be used to inform clinical practices related to socket replacement. A cross-over study was conducted on community ambulators (K-level 3 or 4) with good residual limb sensation. Participants were each provided with two sockets, a duplicate of their as-prescribed socket and a modified socket that was enlarged or reduced by 1...
March 31, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28366038/perceived-self-efficacy-and-specific-self-reported-outcomes-in-persons-with-lower-limb-amputation-using-a-non-microprocessor-controlled-versus-a-microprocessor-controlled-prosthetic-knee
#17
Saffran Möller, Kerstin Hagberg, Kersti Samulesson, Nerrolyn Ramstrand
PURPOSE: To measure self-efficacy in a group of individuals who have undergone a lower-limb amputation and investigate the relationship between self-efficacy and prosthetic-specific outcomes including prosthetic use, mobility, amputation-related problems and global health. A second purpose was to examine if differences exist in outcomes based upon the type of prosthetic knee unit being used. METHOD: Cross-sectional study using the General Self-Efficacy (GSE) Scale and the Questionnaire for Persons with a Transfemoral Amputation (Q-TFA)...
April 1, 2017: Disability and Rehabilitation. Assistive Technology
https://www.readbyqxmd.com/read/28365850/acute-bone-changes-after-lower-limb-amputation-resulting-from-traumatic-injury
#18
D A Bemben, V D Sherk, W J J Ertl, M G Bemben
Bone health is critical for lower limb amputees, affecting their ability to use a prosthesis and their risk of osteoporosis. We found large losses in hip bone mineral density (BMD) and in amputated bone strength in the first year of prosthesis use, suggesting a need for load bearing interventions early post-amputation. INTRODUCTION: Large deficits in hip areal BMD (aBMD) and residual limb volumetric BMD (vBMD) occur after lower limb amputation; however, the time course of these bone quality changes is unknown...
April 1, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/28361217/the-push-through-total-femoral-prosthesis-offers-a-functional-alternative-to-total-femoral-replacement-a-case-series
#19
Jelle Gorter, Joris J W Ploegmakers, Bas L E F Ten Have, Hendrik W B Schreuder, Paul C Jutte
PURPOSE: Oncologic resections or complications of segmental femoral prostheses can result in severe bone loss of the femur for which a total femoral prosthesis (TFP) is required. This study assesses whether the loss of stability and function caused by the loss of muscle attachments can be improved by using a push-through total femoral endoprosthesis (PTTF), because it saves parts of the femur and its muscle attachments. METHODS: In this retrospective case series, ten patients aged 25-77 (mean 54) who received a PTTF between 2005 and 2014 were included for baseline, complications and survival analysis with a mean follow-up of 5...
March 30, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28360121/prosthetic-model-but-not-stiffness-or-height-affects-the-metabolic-cost-of-running-for-athletes-with-unilateral-transtibial-amputations
#20
Owen N Beck, Paolo Taboga, Alena Marie Grabowski
Running-specific prostheses enable athletes with lower limb amputations to run by emulating the spring-like function of biological legs. Current prosthetic stiffness and height recommendations aim to mitigate kinematic asymmetries for athletes with unilateral transtibial amputations. However, it's unclear how different prosthetic configurations influence the biomechanics and metabolic costs of running. Consequently, we investigated how prosthetic model, stiffness, and height affect the biomechanics and metabolic costs of running...
March 30, 2017: Journal of Applied Physiology
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