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Ankle prosthesis

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https://www.readbyqxmd.com/read/28318394/effect-of-foot-and-ankle-immobilization-on-able-bodied-gait-as-a-model-to-increase-understanding-about-bilateral-transtibial-amputee-gait
#1
Antonia Nepomuceno, Matthew J Major, Rebecca Stine, Steven Gard
BACKGROUND: The anatomical foot-ankle complex facilitates advancement of the stance limb through foot rockers and late-stance power generation during walking, but this mechanism is altered for persons with bilateral transtibial amputation when using passive prostheses. OBJECTIVES: To study the effects of bilateral foot and ankle immobilization on able-bodied gait to serve as a model for understanding gait of persons with bilateral transtibial amputation and associated compensatory mechanisms...
March 1, 2017: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/28314214/gait-biomechanics-following-lower-extremity-trauma-amputation-vs-reconstruction
#2
Elizabeth Russell Esposito, Daniel J Stinner, John R Fergason, Jason M Wilken
BACKGROUND: Surgical advances have substantially improved outcomes for individuals sustaining traumatic lower extremity injury. Injuries once requiring lower limb amputation are now routinely managed with limb reconstruction surgery. However, comparisons of functional outcomes between the procedures are inconclusive. PURPOSE: To compare gait biomechanics after lower limb reconstruction and transtibial amputation. METHODS: Twenty-four individuals with unilateral lower limb reconstruction wearing a custom ankle-foot orthosis (Intrepid Dynamic Exoskeletal Orthosis), 24 with unilateral, transtibial amputation, and 24 able-bodied control subjects underwent gait analysis at a standardized Froude speed based on leg length...
February 21, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28278172/the-influence-of-a-hydraulic-prosthetic-ankle-on-residual-limb-loading-during-sloped-walking
#3
Sara R Koehler-McNicholas, Eric A Nickel, Joseph Medvec, Kyle Barrons, Spencer Mion, Andrew H Hansen
In recent years, numerous prosthetic ankle-foot devices have been developed to address the demands of sloped walking for individuals with lower-limb amputation. The goal of this study was to compare the performance of a passive, hydraulic ankle-foot prosthesis to two related, non-hydraulic ankles based on their ability to minimize the socket reaction moments of individuals with transtibial amputation during a range of sloped walking tasks. After a two-week accommodation period, kinematic data were collected on seven subjects with a transtibial amputation walking on an instrumented treadmill set at various slopes...
2017: PloS One
https://www.readbyqxmd.com/read/28269495/split-belt-adaptation-and-gait-symmetry-in-transtibial-amputees-walking-with-a-hybrid-emg-controlled-ankle-foot-prosthesis
#4
Oliver A Kannape, Hugh M Herr
Our ability to automatically adapt our walking pattern to the demands of our environment is central to maintaining a steady gait. Accordingly, a large effort is being made to extend and integrate this adaptability to lower-limb prostheses. To date, the main focus of this research has been on short term adaptation, such as in response to a terrain transition or a sudden change in the environment. However, long term adaptation and underlying sensorimotor learning processes are critical to optimizing walking patterns and predictively changing our gait when faced with continued perturbations...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28269411/preliminary-results-for-an-adaptive-pattern-recognition-system-for-novel-users-using-a-powered-lower-limb-prosthesis
#5
John A Spanias, Ann M Simon, Eric J Perreault, Levi J Hargrove
Powered prosthetic legs are capable of improving the gait of lower limb amputees. Pattern recognition systems for these devices allow amputees to transition between different locomotion modes in a way that is seamless and transparent to the user. However, the potential of these systems is diminished because they require large amounts of training data that is burdensome to collect. To reduce the effort required to acquire these data, we developed an adaptive pattern recognition system that automatically learns from subject-specific data as the user is ambulating...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28269410/delaying-ambulation-mode-transitions-in-a-powered-knee-ankle-prosthesis
#6
Ann M Simon, John A Spanias, Kimberly A Ingraham, Levi J Hargrove
Powered knee and ankle prostheses have the potential to improve the mobility of individuals with a lower limb amputation. As the number of different ambulation modes the prosthesis can be configured for increases, so too does the challenge of how to best transition the prosthesis between these modes. Pattern recognition systems have been suggested as a means to provide seamless and natural transitions, although error rates need to be reduced for these systems to be clinical viable. Delaying mode transitions by a small window may be one way to reduce error rates and improve reliability...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28263806/one-stage-computer-assisted-total-knee-arthroplasty-and-tibial-osteotomy
#7
S Denjean, F Chatain, O Tayot
Same-stage tibial osteotomy may deserve consideration in candidates to total knee arthroplasty (TKA) who have severe bone deformities, particularly at extra-articular sites. This strategy obviates the need for either a major and technically difficult ligament release procedure, which may compromise ligament balancing, or the use of a semi-constrained prosthesis. This technical note describes a one-stage, computer-assisted technique consisting in TKA followed by corrective tibial osteotomy to obtain an overall mechanical axis close to 180° without extensive ligament balancing...
March 2, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28227747/split-belt-adaptation-and-gait-symmetry-in-transtibial-amputees-walking-with-a-hybrid-emg-controlled-ankle-foot-prosthesis
#8
Oliver A Kannape, Hugh M Herr, Oliver A Kannape, Hugh M Herr, Oliver A Kannape, Hugh M Herr
Our ability to automatically adapt our walking pattern to the demands of our environment is central to maintaining a steady gait. Accordingly, a large effort is being made to extend and integrate this adaptability to lower-limb prostheses. To date, the main focus of this research has been on short term adaptation, such as in response to a terrain transition or a sudden change in the environment. However, long term adaptation and underlying sensorimotor learning processes are critical to optimizing walking patterns and predictively changing our gait when faced with continued perturbations...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227654/preliminary-results-for-an-adaptive-pattern-recognition-system-for-novel-users-using-a-powered-lower-limb-prosthesis
#9
John A Spanias, Ann M Simon, Eric J Perreault, Levi J Hargrove, John A Spanias, Ann M Simon, Eric J Perreault, Levi J Hargrove, Eric J Perreault, John A Spanias, Ann M Simon, Levi J Hargrove
Powered prosthetic legs are capable of improving the gait of lower limb amputees. Pattern recognition systems for these devices allow amputees to transition between different locomotion modes in a way that is seamless and transparent to the user. However, the potential of these systems is diminished because they require large amounts of training data that is burdensome to collect. To reduce the effort required to acquire these data, we developed an adaptive pattern recognition system that automatically learns from subject-specific data as the user is ambulating...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227653/delaying-ambulation-mode-transitions-in-a-powered-knee-ankle-prosthesis
#10
Ann M Simon, John A Spanias, Kimberly A Ingraham, Levi J Hargrove, Ann M Simon, John A Spanias, Kimberly A Ingraham, Levi J Hargrove, John A Spanias, Ann M Simon, Kimberly A Ingraham, Levi J Hargrove
Powered knee and ankle prostheses have the potential to improve the mobility of individuals with a lower limb amputation. As the number of different ambulation modes the prosthesis can be configured for increases, so too does the challenge of how to best transition the prosthesis between these modes. Pattern recognition systems have been suggested as a means to provide seamless and natural transitions, although error rates need to be reduced for these systems to be clinical viable. Delaying mode transitions by a small window may be one way to reduce error rates and improve reliability...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28198595/free-microvascular-rotationplasty-with-nerve-repair-for-rhabdomyosarcoma-in-a-18-month-old-patient
#11
Alberto Pérez-García, Marta Salom, María Eloísa Villaverde-Doménech, Francisco Baixauli, Eduardo Simón-Sanz
Rotationplasty is a limb-sparing surgical option in lower limb malignancies. Sciatic or tibial nerve encasement has been considered an absolute contraindication to this procedure. We report a case of an 18-month-old girl with a rhabdomyosarcoma that affected the leg and popliteal fossa, with neurovascular involvement. Knee and proximal leg intercalary resection was performed followed by reconstruction with free microvascular rotationplasty and neurorraphy from tibial division of sciatic nerve to sural and tibial nerves, and from saphenous nerve to superficial peroneal nerve...
February 15, 2017: Microsurgery
https://www.readbyqxmd.com/read/28196036/a-prospective-study-of-four-total-ankle-arthroplasty-implants-by-non-designer-investigators
#12
Tina Lefrancois, Alastair Younger, Kevin Wing, Murray J Penner, Peter Dryden, Hubert Wong, Timothy Daniels, Mark Glazebrook
BACKGROUND: There are several types of prostheses available to surgeons when performing a total ankle arthroplasty (TAA). The main objective of this study was to summarize the clinical and functional outcomes of 4 TAA prostheses: the Hintegra implant (Integra LifeSciences), the Agility implant (DePuy), the Mobility implant (DePuy), and the Scandinavian Total Ankle Replacement (STAR) implant (Small Bone Innovations [SBi]). METHODS: Patients were prospectively recruited...
February 15, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28122388/clinical-study-of-3d-imaging-and-3d-printing-technique-for-patient-specific-instrumentation-in-total-knee-arthroplasty
#13
Bing Qiu, Fei Liu, Bensen Tang, Biyong Deng, Fang Liu, Weimin Zhu, Dong Zhen, Mingyuan Xue, Mingjiao Zhang
Patient-specific instrumentation (PSI) was designed to improve the accuracy of preoperative planning and postoperative prosthesis positioning in total knee arthroplasty (TKA). However, better understanding needs to be achieved due to the subtle nature of the PSI systems. In this study, 3D printing technique based on the image data of computed tomography (CT) has been utilized for optimal controlling of the surgical parameters. Two groups of TKA cases have been randomly selected as PSI group and control group with no significant difference of age and sex (p > 0...
January 25, 2017: Journal of Knee Surgery
https://www.readbyqxmd.com/read/28113980/delaying-ambulation-mode-transition-decisions-improves-accuracy-of-a-flexible-control-system-for-powered-knee-ankle-prosthesis
#14
Ann M Simon, Kimberly A Ingraham, John Spanias, Aaron J Young, Suzanne B Finucane, Elizabeth G Halsne, Levi J Hargrove
Powered lower limb prostheses can assist users in a variety of ambulation modes by providing knee and/or ankle joint power. This study's goal was to develop a flexible control system to allow users to perform a variety of tasks in a natural, accurate, and reliable way. Six transfemoral amputees used a powered knee-ankle prosthesis to ascend/descend a ramp, climb a 3- and 4-step staircase, perform walking and standing transitions to and from the staircase, and ambulate at various speeds. A mode-specific classification architecture was developed to allow seamless transitions at four discrete gait events...
September 22, 2016: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28113346/control-and-evaluation-of-a-powered-transfemoral-prosthesis-for-stair-ascent
#15
Elissa D Ledoux, Michael Goldfarb
This paper assesses the metabolic effort exerted by three transfemoral amputees when using a powered knee and ankle prosthesis for stair ascent, relative to ascending stairs with passive knee and ankle prostheses. The paper describes a controller that provides step-over stair ascent behavior reflective of healthy stair ascent biomechanics, and describes its implementation in a powered prosthesis prototype. Stair ascent experiments were performed with three unilateral transfemoral amputee subjects, comparing the oxygen consumption required to ascend stairs using the powered prosthesis (with a step-over gait), relative to using their daily-use energetically passive prostheses (with a step-to gait)...
January 20, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28105948/active-lower-limb-prosthetics-a-systematic-review-of-design-issues-and-solutions
#16
REVIEW
Michael Windrich, Martin Grimmer, Oliver Christ, Stephan Rinderknecht, Philipp Beckerle
This paper presents a review on design issues and solutions found in active lower limb prostheses. This review is based on a systematic literature search with a methodical search strategy. The search was carried out across four major technical databases and the retrieved records were screened for their relevance. A total of 21 different active prostheses, including 8 above-knee, 9 below-knee and 4 combined knee-ankle prostheses were identified. While an active prosthesis may help to restore the functional performance of an amputee, the requirements regarding the actuation unit as well as for the control system are high and the development becomes a challenging task...
December 19, 2016: Biomedical Engineering Online
https://www.readbyqxmd.com/read/27989336/a-review-of-399-total-ankle-replacements-analysis-of-ipsilateral-subtalar-joint-arthrodesis-and-associated-talar-component-subsidence
#17
Mark A Prissel, Christopher F Hyer, Gregory C Berlet
Total ankle replacement (TAR) is an accepted treatment for end-stage ankle arthritis. When concurrent subtalar joint pathologic features exist, ipsilateral subtalar joint arthrodesis (STJA) can be performed either simultaneous with TAR or as a staged procedure. Limited data exist on the effect of talar component subsidence and prosthesis survivorship. The present study purpose was to evaluate the effect of STJA on talar component subsidence after primary TAR and its effect on TAR survivorship. All patients, a minimum of 18 years old, from a single institution with modern-generation TAR and 1-year minimum follow-up data available were evaluated...
January 2017: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/27881551/comparison-of-the-otto-bock-solid-ankle-cushion-heel-foot-with-wooden-keel-to-the-low-cost-cr-equipements%C3%A2-solid-ankle-cushion-heel-foot-with-polypropylene-keel-a-randomized-prospective-double-blind-crossover-study-assessing-patient-satisfaction-and-energy
#18
Alain Lacraz, Stéphane Armand, Katia Turcot, Gorki Carmona, Richard Stern, Olivier Borens, Mathieu Assal
BACKGROUND: The International Committee of the Red Cross supports a worldwide program of prosthetic fitting and rehabilitation. In this context, a prosthetic foot was developed and widely distributed in least developed countries. STUDY DESIGN: Prospective, randomized, double-blind, controlled study. OBJECTIVE: To compare patient satisfaction and energy expenditure during ambulation between a low-cost prosthetic foot designed with a polypropylene keel (CR-Equipements(™) solid ankle cushion heel, International Committee of the Red Cross) to a well-recognized solid ankle cushion heel foot with a wooden keel (solid ankle cushion heel foot, Otto Bock)...
November 22, 2016: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/27866037/preoperative-preparation-of-a-patient-with-grade-ii-leg-lymphedema-for-his-third-hip-replacement-surgery
#19
Maria de Fátima Guerreiro Godoy, Livia Maria Pereira de Godoy, Renata Lopes Pinto, Jose Maria Pereira de Godoy
INTRODUCTION: The treatment of lymphedema remains a challenge to modern medicine, due to the characteristics of the disease. CASE PRESENTATION: Report on the case of a 75-year-old patient with lower limb lymphedema for treatment prior to surgery. At age 45, he made the first hip replacement surgery in the left leg. One year later he performed the same surgery on the right leg. At that time his legs had slight ankle edema mainly of the left leg and the entire left leg was affected by lymphedema...
2016: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/27846395/mid-term-functional-outcome-of-a-total-arthroplasty-of-the-first-metatarsophalangeal-joint
#20
Corina Nüesch, Annegret Mündermann, Monika Horisberger
BACKGROUND: Arthroplasty of the first metatarsophalangeal joint is an alternative treatment option for end-stage hallux rigidus to the current gold standard of arthrodesis. The aim of this study was to investigate the mid-term functional outcome of an anatomically shaped prosthesis for the first metatarsophalangeal joint using pedobarography. METHODS: Ten patients (12 affected feet; age at surgery: 62.1 (SD: 7.2) years) were investigated preoperatively and 52 (SD: 3) months postoperatively using pedobarography (EMED, novel GmbH, Munich, Germany)...
January 2017: Clinical Biomechanics
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