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Ankle prosthesis

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https://www.readbyqxmd.com/read/29298695/vub-cyberlegs-cybathlon-2016-beta-prosthesis-case-study-in-control-of-an-active-two-degree-of-freedom-transfemoral-prosthesis
#1
Louis L Flynn, Joost Geeroms, Tom van der Hoeven, Bram Vanderborght, Dirk Lefeber
BACKGROUND: Here we present how the CYBERLEGs Beta-Prosthesis was modified with a new control system to participate in the Powered Leg Prosthesis event, and to report on our experience at the CYBATHLON 2016 which was held in Zurich, Switzerland in October 2016. The prosthesis has two active degrees of freedom which assist the user with extra joint power at the knee and ankle to complete tasks. The CYBATHLON is a championship for people with disabilities competing in six disciplines, using advanced assistive devices...
January 3, 2018: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/29277111/the-value-of-motion-patient-reported-outcome-measures-are-correlated-with-range-of-motion-in-total-ankle-replacement
#2
Travis J Dekker, Kamran S Hamid, Andrew E Federer, John R Steele, Mark E Easley, James A Nunley, Samuel B Adams
BACKGROUND: The proposed benefit of total ankle replacement (TAR) over ankle fusion is preserved ankle motion, thus we hypothesized that an increase in range of motion (ROM) is positively correlated with validated patient-reported outcome measures (PROMs) in individuals receiving TAR. METHODS: Patients undergoing TAR at a single academic medical center between 2007 and 2013 were evaluated in this study. In addition to a minimum of 2-year follow-up, complete preoperative and postoperative outcome measures for the Foot and Ankle Disability Index (FADI), Short Musculoskeletal Function Assessment (SMFA) Bother and Function Indices, Visual Analog Scale (VAS), and 36-Item Short Form Health Survey (SF-36) were requisite for inclusion...
December 1, 2017: Foot & Ankle Specialist
https://www.readbyqxmd.com/read/29217446/the-use-of-the-profunda-femoral-artery-as-the-sole-target-vessel-to-bypass-aorto-iliac-disease-in-patients-with-critical-limb-ischemia-and-concomitant-unreconstructable-infra-inguinal-disease
#3
Nikolaos Kontopodis, Stella Lioudaki, Christos Chronis, Paris Kalogerakos, George Lazopoulos, Alexandra Papaioannou, Christos V Ioannou
BACKGROUND: Critical limb ischemia (CLI) often results from multilevel occlusive disease. There are occasions where a patent profunda femoral artery (PFA) is the only target artery that can be used as outflow during reconstruction to bypass aorto-iliac disease (AOID), with no further option for infra-inguinal revascularization. We aim to report results of the use of PFA as the sole target vessel for the treatment of these patients. METHODS: This is a retrospective, single-center study including CLI patients treated during 36-months...
December 4, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/29189099/creative-prosthetic-foot-selection-enables-successful-ambulation-in-stiletto-high-heels
#4
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/29188174/diagnosis-of-persistent-infection-in-prosthetic-two-stage-exchange-pcr-analysis-of-sonication-fluid-from-bone-cement-spacers
#5
Sandrine Mariaux, Ulrika Furustrand Tafin, Olivier Borens
Introduction: When treating periprosthetic joint infections with a two-stage procedure, antibiotic-impregnated spacers are used in the interval between removal of prosthesis and reimplantation. According to our experience, cultures of sonicated spacers are most often negative. The objective of our study was to investigate whether PCR analysis would improve the detection of bacteria in the spacer sonication fluid. Methods: A prospective monocentric study was performed from September 2014 to January 2016. Inclusion criteria were two-stage procedure for prosthetic infection and agreement of the patient to participate in the study...
2017: Journal of Bone and Joint Infection
https://www.readbyqxmd.com/read/29186357/outcome-of-ankle-arthrodesis-and-ankle-prosthesis-a-review-of-the-current-status
#6
Nicola Maffulli, Umile Giuseppe Longo, Joel Locher, Giovanni Romeo, Giuseppe Salvatore, Vincenzo Denaro
Introduction: In advanced stages of ankle osteoarthritis (OA), ankle arthrodesis (AA) or total ankle arthroplasty (TAR) may be necessary. Our purpose is to compare AA and total ankle replacement for the surgical management of end stage ankle OA. Sources of data: We conducted a literature search of PubMed, Medline, CINAHL, Cochrane, Embase and Google Scholar databases using the terms 'ankle' in combination with 'OA', 'arthrodesis', 'arthroplasty', 'joint fusion', 'joint replacement'...
November 23, 2017: British Medical Bulletin
https://www.readbyqxmd.com/read/29184493/step-to-step-ankle-inversion-eversion-torque-modulation-can-reduce-effort-associated-with-balance
#7
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
https://www.readbyqxmd.com/read/29181560/stability-and-alignment-do-not-improve-by-using-patient-specific-instrumentation-in-total-knee-arthroplasty-a-randomized-controlled-trial
#8
Nienke M Kosse, Petra J C Heesterbeek, Janneke J P Schimmel, Gijs G van Hellemondt, Ate B Wymenga, Koen C Defoort
PURPOSE: The primary aim of the study was to examine stability and alignment after total knee arthroplasty (TKA) using patient-specific instrumentation (PSI) and conventional instrumentation (CI). The hypothesis was that stability and alignment would be better using PSI than CI, 12 months postoperatively. The secondary aim included the evaluation of clinical outcomes after TKA. METHODS: In this prospective randomized controlled trial, 42 patients with knee osteoarthritis received a Genesis II PS prosthesis with either PSI or CI...
November 28, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29178861/contact-stresses-pressure-and-area-in-a-fixed-bearing-total-ankle-replacement-a-finite-element-analysis
#9
Nicolo Martinelli, Silvia Baretta, Jenny Pagano, Alberto Bianchi, Tomaso Villa, Gloria Casaroli, Fabio Galbusera
BACKGROUND: Mobile-bearing ankle implants with good clinical results continued to increase the popularity of total ankle arthroplasty to address endstage ankle osteoarthritis preserving joint movement. Alternative solutions used fixed-bearing designs, which increase stability and reduce the risk of bearing dislocation, but with a theoretical increase of contact stresses leading to a higher polyethylene wear. The purpose of this study was to investigate the contact stresses, pressure and area in the polyethylene component of a new total ankle replacement with a fixed-bearing design, using 3D finite element analysis...
November 25, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29156072/clinical-and-radiologic-outcomes-of-metatarsophalangeal-hemiarthroplasty-a-review-of-12-consecutive-cases
#10
Florian Wanivenhaus, Jacqueline Fust, Matthias Erschbamer, Andreas Schirm
This study examined function, pain, satisfaction, and radiologic outcomes among patients treated with first metatarsophalangeal hemiarthroplasty. Patients were invited to participate in an outcome study conducted with questionnaires on subjective and objective outcomes and clinical and radiographic follow-up. A total of 12 patients (12 feet; mean patient age, 58.8±12.3 years) agreed to participate. Mean follow-up was 22.3±19.8 months. Of these patients, 7 were satisfied with the postoperative result. The mean visual analog scale pain score decreased significantly from 7...
November 20, 2017: Orthopedics
https://www.readbyqxmd.com/read/29149213/optimal-design-and-control-of-an-electromechanical-transfemoral-prosthesis-with-energy-regeneration
#11
Farbod Rohani, Hanz Richter, Antonie J van den Bogert
In this paper, we present the design of an electromechanical above-knee active prosthesis with energy storage and regeneration. The system consists of geared knee and ankle motors, parallel springs for each motor, an ultracapacitor, and controllable four-quadrant power converters. The goal is to maximize the performance of the system by finding optimal controls and design parameters. A model of the system dynamics was developed, and used to solve a combined trajectory and design optimization problem. The objectives of the optimization were to minimize tracking error relative to human joint motions, as well as energy use...
2017: PloS One
https://www.readbyqxmd.com/read/29126036/bone-cyst-formation-after-ankle-arthroplasty-may-be-caused-by-stress-shielding-a-numerical-simulation-of-the-strain-adaptive-bone-remodelling
#12
Hazibullah Waizy, Bernd-Arno Behrens, Kerstin Radtke, Amer Almohallami, Christina Stukenborg-Colsman, Anas Bouguecha
BACKGROUND: The history of total ankle arthroplasty (TAA) has different evolution steps to improve the outcome. The third generation implants show an overall 8-year survival rate up to 93%. The main reported reason for early failure of TAA is aseptic loosening, cyst formation is also frequently reported. The aim of the present study is to use the finite element (FE) method to analyze the adaptive bone remodeling processes, including cyst formation after TAA. METHODS: Bone characteristics applied to the model corresponded to information obtained from computed tomography...
December 2017: Foot
https://www.readbyqxmd.com/read/29114624/sports-and-recreational-activities-following-total-ankle-replacement
#13
Federico Giuseppe Usuelli, Andrea Pantalone, Camilla Maccario, Matteo Guelfi, Vincenzo Salini
Purpose  In literature, there is a controversy regarding whether patients who have undergone total ankle replacement (TAR) can participate in sports and recreational activities. The purpose of this study was to report change in sports activity level after TAR. Methods  A retrospective study was performed, enrolling 76 patients with symptomatic end-stage ankle arthritis who underwent TAR from May 2011 to October 2014. Patients were mainly males (44/76; 58%) and 56 years old on average (range: 22.3-79.6 years) at the time of surgery...
March 2017: Joints
https://www.readbyqxmd.com/read/29110512/short-term-clinical-and-radiographic-results-of-the-salto-mobile-total-ankle-prosthesis
#14
Dong Dong Wan, Woo Jin Choi, Dong Woo Shim, Yeokgu Hwang, Yoo Jung Park, Jin Woo Lee
BACKGROUND: The mobile-bearing Salto total ankle prosthesis has been reported to have promising outcomes. However, clinical reports on this prosthesis are few, and most have been published by the inventors and disclosed consultants. METHODS: We retrospectively reviewed 59 patients who received Salto prosthesis unilaterally. The average follow-up was 35.9 (range, 6-56) months. Clinical and radiologic results were evaluated. Clinical results were evaluated according to visual analog scale (VAS), American Orthopaedic Foot & Ankle Society (AOFAS) ankle-hindfoot score, Ankle Osteoarthritis Scale (AOS) pain and disability score, and ankle range of motion (ROM) in dorsiflexion/plantarflexion...
November 1, 2017: Foot & Ankle International
https://www.readbyqxmd.com/read/29035609/single-surgeon-experience-and-complications-of-a-fixed-bearing-total-ankle-arthroplasty
#15
Garett J Pangrazzi, Erin A Baker, Phillip J Shaheen, Chikezie N Okeagu, Paul T Fortin
BACKGROUND: Total ankle arthroplasty (TAA) has historically resulted in inferior survivorship rates compared with total hip and knee arthroplasty, because of technical issues unique to ankle anatomy. In this study, a single-surgeon series of intra- and postoperative complications as well as resultant reoperations/revisions of the Tornier Salto Talaris, a fixed-bearing TAA prosthesis, were reviewed. METHODS: Medical records from index procedure to latest follow-up of primary TAA were reviewed...
October 1, 2017: Foot & Ankle International
https://www.readbyqxmd.com/read/29019467/online-adaptive-neural-control-of-a-robotic-lower-limb-prosthesis
#16
John Spanias, Ann M Simon, Suzanne Finucane, Eric Perreault, Levi Hargrove
OBJECTIVE: The purpose of this study was to develop and evaluate an adaptive intent recognition algorithm that continuously learns to incorporate a lower limb amputee's neural information (acquired via electromyography [EMG]) as they ambulate with a robotic leg prosthesis. APPROACH: We present a powered lower limb prosthesis that was configured to acquire the user's neural information and kinetic/kinematic information from embedded mechanical sensors, and identify and respond to the user's intent...
October 11, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28975280/the-functional-roles-of-muscles-passive-prostheses-and-powered-prostheses-during-sloped-walking-in-people-with-a-transtibial-amputation
#17
Nathaniel T Pickle, Alena M Grabowski, Jana R Jeffers, Anne K Silverman
Sloped walking is challenging for individuals with transtibial amputation (TTA) due to the functional loss of the ankle plantarflexors. Prostheses that actively generate ankle power may help to restore this lost function. The purpose of this study was to use musculoskeletal modeling and simulation to quantify the mechanical power delivered to body segments by passive and powered prostheses and the remaining muscles in the amputated and intact legs during sloped walking. We generated walking simulations from experimental kinematic and kinetic data on slopes of 0, ±3 deg and ±6 deg in eight people with a TTA using powered and passive prostheses and eight nonamputees...
November 1, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28948831/midterm-outcomes-of-a-fixed-bearing-total-ankle-arthroplasty-with-deformity-analysis
#18
Andrew Harston, Alexander L Lazarides, Samuel Adams, James DeOrio, Mark Easley, James Nunley
BACKGROUND: We present our results with an INBONE I (Wright Medical, Memphis, TN) prosthesis who have a minimum of 4 to 10 years of follow-up and include a preoperative deformity analysis on outcomes. METHODS: A consecutive series of 149 patients, from 2007 to 2011, at a single institution were enrolled. Pain and patient-reported function were assessed preoperatively and at yearly follow-ups. We analyzed the data for complications, reoperations, and failures (defined as undergoing revision for exchange or removal of one or both metallic components for any reason)...
September 1, 2017: Foot & Ankle International
https://www.readbyqxmd.com/read/28885156/the-vspa-foot-a-quasi-passive-ankle-foot-prosthesis-with-continuously-variable-stiffness
#19
Max K Shepherd, Elliott J Rouse
Most commercially available prosthetic feet do not exhibit a biomimetic torque-angle relationship, and are unable to modulate their mechanics to assist with other mobility tasks, such as stairs and ramps. In this work, we present a quasi-passive ankle-foot prosthesis with a customizable torque-angle curve and an ability to quickly modulate ankle stiffness between tasks. The customizable torque-angle curve is obtained with a cam-based transmission and a fiberglass leaf spring. To achieve variable stiffness, the leaf spring's support conditions can be actively modulated by a small motor, shifting the torque-angle curve to be more or less stiff...
September 7, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28871360/the-aes-total-ankle-arthroplasty-analysis-of-failures-and-survivorship-at-ten-years
#20
Alexandre Di Iorio, Anthony Viste, Michel Henry Fessy, Jean Luc Besse
BACKGROUND: AES mobile-bearing total ankle replacement was developed from the Buechel Pappas model. It was withdrawn in 2009, after identification of a higher than expected complication rate. The purpose of the current study was to analyse clinical outcomes, failures and survival of the initial series of 50 AES published in 2009. METHODS: In this single-centre continuous prospective study (2003-2006), 50 AES prostheses were included. Pre-operative osteoarthritis was mainly post-traumatic (50%) and secondary to instability (36%)...
December 2017: International Orthopaedics
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