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Limb prosthesis

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https://www.readbyqxmd.com/read/28336738/single-stage-osseointegrated-reconstruction-and-rehabilitation-of-lower-limb-amputees-the-osseointegration-group-of-australia-accelerated-protocol-2-ogaap-2-for-a-prospective-cohort-study
#1
Munjed Al Muderis, William Lu, Kevin Tetsworth, Belinda Bosley, Jiao Jiao Li
INTRODUCTION: Lower limb amputations have detrimental influences on the quality of life, function and body image of the affected patients. Following amputation, prolonged rehabilitation is required for patients to be fitted with traditional socket prostheses, and many patients experience symptomatic socket-residuum interface problems which lead to reduced prosthetic use and quality of life. Osseointegration has recently emerged as a novel approach for the reconstruction of amputated limbs, which overcomes many of the socket-related problems by directly attaching the prosthesis to the skeletal residuum...
March 22, 2017: BMJ Open
https://www.readbyqxmd.com/read/28325033/user-intent-prediction-with-a-scaled-conjugate-gradient-trained-artificial-neural-network-for-lower-limb-amputees-using-a-powered-prosthesis
#2
Richard B Woodward, John A Spanias, Levi J Hargrove
Powered lower limb prostheses have the ability to provide greater mobility for amputee patients. Such prostheses often have pre-programmed modes which can allow activities such as climbing stairs and descending ramps, something which many amputees struggle with when using non-powered limbs. Previous literature has shown how pattern classification can allow seamless transitions between modes with a high accuracy and without any user interaction. Although accurate, training and testing each subject with their own dependent data is time consuming...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28325032/limb-position-robust-classification-of-myoelectric-signals-for-prosthesis-control-using-sparse-representations
#3
Joseph L Betthauser, Christopher L Hunt, Luke E Osborn, Rahul R Kaliki, Nitish V Thakor
The fundamental objective in non-invasive myoelectric prosthesis control is to determine the user's intended movements from corresponding skin-surface recorded electromyographic (sEMG) activation signals as quickly and accurately as possible. Linear Discriminant Analysis (LDA) has emerged as the de facto standard for real-time movement classification due to its ease of use, calculation speed, and remarkable classification accuracy under controlled training conditions. However, performance of cluster-based methods like LDA for sEMG pattern recognition degrades significantly when real-world testing conditions do not resemble the trained conditions, limiting the utility of myoelectrically controlled prosthesis devices...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28322115/lower-extremity-kinematics-of-curve-sprinting-displayed-by-runners-using-a-transtibial-prosthesis
#4
Yumeng Li, Kathy J Simpson, Lee Nolan, Marilyn Miller, Benjamin Johnson
The purpose of the study was to determine if the kinematics exhibited by skilled runners wearing a unilateral, transtibial prosthesis during the curve section of a 200-m sprint race were influenced by interaction of limb-type (prosthetic limb (PROS-L) vs. nonprosthetic limb (NONPROS-L)) and curve-side (inside and outside limb relative to the centre of the curve). Step kinematics, toe clearance and knee and hip flexion/extension, hip ab/adduction for one stride of each limb were generated from video of 13 males running the curve during an international 200 m transtibial-classified competition...
March 21, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28320228/living-as-a-person-using-a-lower-limb-prosthesis-in-nepal
#5
Anna Järnhammer, Beatrice Andersson, Prakash Raj Wagle, Lina Magnusson
PURPOSE: The purpose of this study is to explore experiences of persons in Nepal using lower-limb prostheses, in relation to specific articles in the Convention on the Rights of Persons with Disabilities that consider mobility, education, health, rehabilitation, and work and employment. METHOD: Qualitative interviews were conducted with 16 persons using lower limb prostheses. Content analysis was applied to the data. RESULTS: Six themes emerged: The lower-limb prosthesis is essential for mobility and daily life; Limited mobility in challenging terrain and request for reduced pain when using prosthesis; Difficulties in finding and sustaining employment emphasized the importance of vocational training; Appreciation of comprehensive rehabilitation together with other persons with amputations, but covering related costs is a struggle; Satisfied with health care, but concerned that it creates debt and dependence upon others; and finally, Limited ability creates negative self-image and varied attitudes in other people...
March 21, 2017: Disability and Rehabilitation
https://www.readbyqxmd.com/read/28318402/ipsilateral-scapular-cutaneous-anchor-system-an-alternative-for-the-harness-in-body-powered-upper-limb-prostheses
#6
Mona Hichert, Dick H Plettenburg
BACKGROUND: Body-powered prosthesis users frequently complain about the poor cosmesis and comfort of the traditional shoulder harness. The Ipsilateral Scapular Cutaneous Anchor System offers an alternative, but it remains unclear to what extent it affects the perception and control of cable operation forces compared to the traditional shoulder harness. OBJECTIVE: To compare cable force perception and control with the figure-of-nine harness versus the Ipsilateral Scapular Cutaneous Anchor System and to investigate force perception and control at different force levels...
March 1, 2017: Prosthetics and Orthotics International
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
#7
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/28318387/a-qualitative-study-of-the-challenges-of-providing-pre-prosthetic-rehabilitation-in-rural-south-africa
#8
Liezel Ennion, Anton Johannesson Johannesson
BACKGROUND: There is a known shortage of rehabilitation staff in rural settings and a sharp increase in the number of lower limb amputations being performed. A lack of adequate pre-prosthetic rehabilitation will result in worse physical and psychological outcomes for a person with a lower limb amputation, and they will not be eligible to be fitted with a prosthesis. OBJECTIVE: To explore therapists' experiences with providing pre-prosthetic rehabilitation in a rural setting...
March 1, 2017: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/28314214/gait-biomechanics-following-lower-extremity-trauma-amputation-vs-reconstruction
#9
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/28301512/adaptation-to-random-and-systematic-errors-comparison-of-amputee-and-non-amputee-control-interfaces-with-varying-levels-of-process-noise
#10
Reva E Johnson, Konrad P Kording, Levi J Hargrove, Jonathon W Sensinger
The objective of this study was to understand how people adapt to errors when using a myoelectric control interface. We compared adaptation across 1) non-amputee subjects using joint angle, joint torque, and myoelectric control interfaces, and 2) amputee subjects using myoelectric control interfaces with residual and intact limbs (five total control interface conditions). We measured trial-by-trial adaptation to self-generated errors and random perturbations during a virtual, single degree-of-freedom task with two levels of feedback uncertainty, and evaluated adaptation by fitting a hierarchical Kalman filter model...
2017: PloS One
https://www.readbyqxmd.com/read/28293984/hip-prosthesis-in-sitting-posture-for-bilateral-transfemoral-amputee-after-burn-injury-a-case-report
#11
Yukiyo Shimizu, Hirotaka Mutsuzaki, Takayuki Maezawa, Yuji Idei, Kazuya Takao, Ryoko Takeuchi, Shinzo Onishi, Yasushi Hada, Masashi Yamazaki, Yasuyoshi Wadano
BACKGROUND: To overcome the challenges of rehabilitation of bilateral transfemoral amputees, we developed a novel "hip prosthesis in the sitting posture." Case Description and Methods: A 64-year-old male bilateral transfemoral amputee was transferred for rehabilitation 4 months following a burn injury. His wounds remained unhealed for 20 months; thus, he was unable to participate in standing training with the standard prosthetic sockets. Hip prosthesis in the sitting posture has very little friction between the sockets and residual limbs, which facilitated our patient to begin standing and walking exercises...
December 1, 2016: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/28286964/factors-impacting-participation-in-sports-for-children-with-limb-absence-a-qualitative-study
#12
Batoul Sayed Ahmed, Marena Lamy, Debra Cameron, Lisa Artero, Sandra Ramdial, Matthew Leineweber, Jan Andrysek
BACKGROUND: Individuals with limb absence benefit from participating in sports. While barriers and facilitators affecting sport participation are well documented for adults, they have not been explored for children with limb absence. PURPOSE: To identify the perceived factors impacting participation in sports according to children with limb absence and their parents. METHODS: This study uses a descriptive qualitative study design. Nineteen participants, consisting of children and their parents, were recruited from an outpatient hospital clinic for semi-structured interviews...
March 12, 2017: Disability and Rehabilitation
https://www.readbyqxmd.com/read/28285881/finite-element-analysis-of-the-amputated-lower-limb-a-systematic-review-and-recommendations
#13
REVIEW
A S Dickinson, J W Steer, P R Worsley
The care and rehabilitation of individuals after lower limb amputation presents a substantial and growing socioeconomic challenge. Clinical outcome is closely linked to successful functional rehabilitation with a prosthetic limb, which depends upon comfortable prosthetic limb - residual limb load transfer. Despite early interest in the 1980s, the amputated limb has received considerably less attention in computational biomechanical analysis than other subjects, such as arthroplasty. This systematic literature review investigates the state of the art in residual limb finite element analysis published since 2000...
March 9, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28280845/-function-of-prosthesis-components-in-lower-limb-amputees-with-bone-anchored-percutaneous-implants-biomechanical-aspects
#14
S Blumentritt
BACKGROUND: Bone anchorage of an artificial limb has been proven to be an alternative intervention for amputees when prosthesis use is seriously reduced because of stump problems. Little is known about how prosthesis components interact with bone and joints and which potential the optimum use provides with respect to quality of treatment of leg amputees. OBJECTIVE: Does osseointegration influence the motor activity of residual limbs differently compared with socket prostheses? How should prosthesis components be aligned? What type of prosthetic knee joints should be preferred in transfemoral amputees? MATERIAL AND METHODS: Transfer of biomechanical knowledge of socket prosthetics to bone-anchored prostheses...
March 9, 2017: Der Unfallchirurg
https://www.readbyqxmd.com/read/28278172/the-influence-of-a-hydraulic-prosthetic-ankle-on-residual-limb-loading-during-sloped-walking
#15
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/28275847/the-compress%C3%A2-transcutaneous-implant-for-rehabilitation-following-limb-amputation
#16
R L McGough, M A Goodman, R L Randall, J A Forsberg, B K Potter, B Lindsey
Amputation is an unfortunate outcome of a variety of orthopedic conditions. Many amputees can be functionally fitted with conventional suspension sockets. A substantial subset, however, fails this conventional treatment and is unable to function. In Europe, an alternative to socket-based prostheses has been available for 25 years. Patients there who are unable to functionally use socket-based prostheses have been offered the possibility for transcutaneous osseointegration. With this technology, the prosthetic limb can be rigidly attached to the residual bone, and the socket is eliminated, in many cases enabling improved function and patient satisfaction...
March 8, 2017: Der Unfallchirurg
https://www.readbyqxmd.com/read/28269705/real-time-evaluation-of-a-myoelectric-control-method-for-high-level-upper-limb-amputees-based-on-homologous-leg-movements
#17
Kenneth R Lyons, Sanjay S Joshi
Electromyography-based gesture classification methods for control of advanced upper limb prostheses are limited either to individuals with amputations distal to the elbow or to those willing to undergo targeted muscle reinnervation surgery. Based on the natural similarity between gestures of the lower leg and the arm and on established methods in electromyography-based gesture classification, we propose a noninvasive system with which users control an upper limb prosthesis via homologous movements of the leg and foot...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28269495/split-belt-adaptation-and-gait-symmetry-in-transtibial-amputees-walking-with-a-hybrid-emg-controlled-ankle-foot-prosthesis
#18
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
#19
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
#20
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
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