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https://www.readbyqxmd.com/read/28984381/longitudinal-changes-in-knee-gait-mechanics-between-2-and-8-years-after-anterior-cruciate-ligament-reconstruction
#1
Jennifer C Erhart-Hledik, Constance R Chu, Jessica L Asay, Thomas P Andriacchi
The purpose of this study was to longitudinally investigate changes in knee joint kinematics and kinetics from 2 to 8 years post-ACLR. Seventeen subjects with primary unilateral transtibial ACLR performed bilateral gait analysis approximately 2 years and 8 years post-ACLR. Seventeen matched healthy control subjects were also analyzed. Kinematic and kinetic comparisons between the ACLR and contralateral limbs over time were completed using a 2 × 2 (time, limb) repeated-measures ANOVA. Unpaired Student's t-tests were used to compare the ACLR and contralateral kinematics and kinetics to the control group...
October 6, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
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
#2
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/28970992/anterior-cruciate-ligament-reconstruction-with-bone-patellar-tendon-bone-graft-through-a-rectangular-bone-tunnel-made-with-a-rectangular-retro-dilator-an-operative-technique
#3
Hiroteru Hayashi, Daisaburo Kurosaka, Mitsuru Saito, Ryo Ikeda, Eiji Kijima, Yu Yamashita, Keishi Marumo
Good clinical results have been reported with anatomic anterior cruciate ligament (ACL) reconstructions in which rectangular bone-patellar tendon-bone (BTB) grafts were fixed into rectangular bone tunnels made at anatomic ACL insertion sites of the femur and tibia (anatomic rectangular tunnel BTB ACL reconstruction). Notwithstanding these good results, some problems have remained unsolved, including procedural complexity and risk of damage to the femoral posterior tunnel wall, damage to nerves and blood vessels, and damage to cartilage...
August 2017: Arthroscopy Techniques
https://www.readbyqxmd.com/read/28968587/development-of-a-limits-of-stability-protocol-for-use-in-transtibial-prosthesis-users-learning-effects-and-reliability-of-outcome-variables
#4
David F Rusaw, Elin Rudholmer, Cleveland T Barnett
The aims of this study were to empirically quantify reliability and learning effects of a Limits of Stability protocol for transtibial prosthesis users. Outcome variables from center of pressure and center of mass were tested on: 1) multiple test repetitions within a single test occasion; and 2) between multiple test occasions. Trantibial prosthesis users (n=7) and matched controls (n=7) executed five trials of the Limits of Stability protocol on two occasions per day, on two consecutive days. Inter-trial learning effects and reliability of outcomes extracted via center of mass and center of pressure were evaluated utilizing standard biomechanics laboratory equipment...
August 21, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28946827/development-of-a-high-performance-transtibial-cycling-specific-prosthesis-for-the-london-2012-paralympic-games
#5
Bryce Dyer, Howard Woolley
BACKGROUND AND AIM: It has been reported that cycling-specific research relating to participants with an amputation is extremely limited in both volume and frequency. However, practitioners might participate in the development of cycling-specific prosthetic limbs. This technical note presents the development of a successful design of a prosthetic limb developed specifically for competitive cycling. TECHNIQUE: This project resulted in a hollow composite construction which was low in weight and shaped to reduce a rider's aerodynamic drag...
October 2017: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/28946824/clinical-evaluation-of-a-prosthetic-suspension-system-looped-silicone-liner
#6
Noor Azuan Abu Osman, Hossein Gholizadeh, Arezoo Eshraghi, Wan Abu Bakar Wan Abas
OBJECTIVES: This study aimed to evaluate and compare a newly designed suspension system with a common suspension in the market. STUDY DESIGN: Prospective study. METHODS: Looped liners with hook fastener and Iceross Dermo Liner with pin/lock system were mechanically tested using a tensile testing machine in terms of system safety. A total of 10 transtibial amputees participated in this study and were asked to use these two different suspension systems...
October 2017: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/28931325/outcomes-of-talus-fractures-associated-with-high-energy-combat-trauma
#7
Travis Junge, Jaime Bellamy, Thomas Dowd, Patrick Osborn
BACKGROUND: Talus fractures are infrequent injuries that are often associated with poor clinical outcomes. Literature reviewing talus fractures is limited to a civilian population, with few studies characterizing these injuries sustained in active duty personnel. The aim of this study was to characterize talus fractures sustained in combat trauma by reporting their surgical outcomes. METHODS: The Department of Defense Trauma Registry (DoDTR) was queried to identify US service members who sustained talus fractures in battle conditions between 2001 and 2014...
September 1, 2017: Foot & Ankle International
https://www.readbyqxmd.com/read/28926380/osseointegrated-transtibial-implants-in-patients-with-peripheral-vascular-disease-a-multicenter-case-series-of-5-patients-with-1-year-follow-up
#8
MULTICENTER STUDY
Robin Atallah, Jiao Jiao Li, William Lu, Ruud Leijendekkers, Jan Paul Frölke, Munjed Al Muderis
BACKGROUND: Osseointegration is an alternative treatment for amputees who are unable to wear or have difficulty wearing a socket prosthesis. Although the majority of limb amputations are due to vascular disease, such amputations have been perceived as a contraindication to osseointegration surgery. We report the outcomes of osseointegrated reconstruction in a series of 5 patients with limb amputation due to peripheral vascular disease. METHODS: Five patients with transtibial amputation and a history of peripheral vascular disease who received an osseointegration implant from 2014 to 2015 were followed for 12 months...
September 20, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28893312/the-validity-and-reliability-of-the-four-square-step-test-in-different-adult-populations-a-systematic-review
#9
Martha Moore, Karen Barker
BACKGROUND: The four square step test (FSST) was first validated in healthy older adults to provide a measure of dynamic standing balance and mobility. The FSST has since been used in a variety of patient populations. The purpose of this systematic review is to determine the validity and reliability of the FSST in these different adult patient populations. METHODS: The literature search was conducted to highlight all the studies that measured validity and reliability of the FSST...
September 11, 2017: Systematic Reviews
https://www.readbyqxmd.com/read/28888109/biomechanical-compensations-of-the-trunk-and-lower-extremities-during-stepping-tasks-after-unilateral-transtibial-amputation
#10
Amanda M Murray, Brecca M Gaffney, Bradley S Davidson, Cory L Christiansen
BACKGROUND: Lower extremity movement compensations following transtibial amputation are well-documented and are likely influenced by trunk posture and movement. However, the biomechanical compensations of the trunk and lower extremities, especially during high-demand tasks such as step ascent and descent, remain unclear. METHODS: Kinematic and kinetic data were collected during step ascent and descent tasks for three groups of individuals: diabetic/transtibial amputation, diabetic, and healthy...
August 30, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28885156/the-vspa-foot-a-quasi-passive-ankle-foot-prosthesis-with-continuously-variable-stiffness
#11
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/28876275/outcomes-after-severe-distal-tibia-ankle-and-or-foot-trauma-comparisons-of-limb-salvage-versus-transtibial-amputation-outlet-erratum
#12
(no author information available yet)
No abstract text is available yet for this article.
September 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28875131/femoral-positioning-influences-ipsi-and-contralateral-anterior-cruciate-ligament-rupture-following-its-reconstruction-systematic-review-and-meta-analysis
#13
Gustavo Constantino de Campos, Paulo Eduardo Portes Teixeira, Alex Castro, Wilson de Mello Alves Junior
AIM: To systematically review the incidence of ipsilateral graft re-rupture and contralateral anterior cruciate ligament (ACL) rupture following its reconstruction, with special attention to the femoral drilling technique. METHODS: Systematic review and meta-analysis of high-level prospective studies searched in MEDLINE database following PRISMA statement. The rate of ipsilateral graft re-rupture and contralateral rupture in patients submitted to either transtibial (TT) technique (isometric) or anteromedial (AM) technique (anatomic) was compared...
August 18, 2017: World Journal of Orthopedics
https://www.readbyqxmd.com/read/28869901/transtibial-prosthetic-socket-shape-in-a-developing-country-a-study-to-compare-initial-outcomes-in-pressure-cast-hydrostatic-and-patella-tendon-bearing-designs
#14
Sheridan Laing, Noel Lythgo, Jim Lavranos, Peter Vee Sin Lee
This study compared the physical function and comfort level of patients with unilateral transtibial amputation after being fitted with a hand-cast Patella Tendon Bearing (PTB) socket and a pressure-cast (PCAST) hydrocast socket. The latter technique aims to reduce the skill dependency currently required for socket manufacture and fit. The study was conducted at the Vietnamese Training Centre for Orthopaedic Technologies and involved seventeen Vietnamese participants with unilateral transtibial amputation, all of whom were long term users of prosthetics...
October 2017: Gait & Posture
https://www.readbyqxmd.com/read/28869812/the-effects-of-prosthetic-foot-stiffness-on-transtibial-amputee-walking-mechanics-and-balance-control-during-turning
#15
Courtney E Shell, Ava D Segal, Glenn K Klute, Richard R Neptune
BACKGROUND: Little evidence exists regarding how prosthesis design characteristics affect performance in tasks that challenge mediolateral balance such as turning. This study assesses the influence of prosthetic foot stiffness on amputee walking mechanics and balance control during a continuous turning task. METHODS: Three-dimensional kinematic and kinetic data were collected from eight unilateral transtibial amputees as they walked overground at self-selected speed clockwise and counterclockwise around a 1-meter circle and along a straight line...
August 15, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28862042/the-component-timed-up-and-go-test-the-utility-and-psychometric-properties-of-using-a-mobile-application-to-determine-prosthetic-mobility-in-people-with-lower-limb-amputations
#16
Sheila M Clemens, Robert S Gailey, Christopher L Bennett, Paul F Pasquina, Neva J Kirk-Sanchez, Ignacio A Gaunaurd
OBJECTIVE: Using a custom mobile application to evaluate the reliability and validity of the Component Timed-Up-and-Go test to assess prosthetic mobility in people with lower limb amputation. DESIGN: Cross-sectional design. SETTING: National conference for people with limb loss. SUBJECTS: A total of 118 people with non-vascular cause of lower limb amputation participated. Subjects had a mean age of 48 (±13.7) years and were an average of 10 years post amputation...
August 1, 2017: Clinical Rehabilitation
https://www.readbyqxmd.com/read/28854766/one-year-serial-follow-up-magnetic-resonance-imaging-study-of-rigidfix-for-femoral-fixation-in-anterior-cruciate-ligament-reconstruction
#17
Jung Ho Noh, Jae Woo Lee
Purpose: To assess graft slippage at the site of femoral fixation by follow-up magnetic resonance imaging (MRI) after anterior cruciate ligament (ACL) reconstruction with a four-strand autogenous hamstring tendon using RigidFix (DePuy Mitek). Materials and Methods: Twenty-one subjects diagnosed with ACL rupture underwent ACL reconstruction using hamstring autograft with the transtibial technique. RigidFix was used for femoral fixation and Intrafix and washer screw were used for tibial fixation...
September 1, 2017: Knee Surgery & related Research
https://www.readbyqxmd.com/read/28854765/tomographic-study-of-femoral-positioning-in-anterior-cruciate-ligament-reconstruction-using-the-transtibial-technique
#18
Robson Rocha da Silva, Marcos Almeida Matos, Valonie Carlos Neves Brasileiro Costa, Vitor Hugo Abreu Azevedo de Morais, Luiz Eduardo Lago de Castro
Purpose: To analyze the location of the femoral tunnel by three-dimensional computed tomography (3D CT) of the lateral condyle in patients who underwent arthroscopic single-bundle anterior cruciate ligament (ACL) reconstruction, performed using a modified transtibial technique, and to compare the results with data from the literature. Materials and Methods: Seventeen patients with ACL lesions underwent modified transtibial ACL reconstruction. Postoperatively, 3D CT examinations were performed and the images were analyzed by the quadrant system described by Bernard and Hertel to define the femoral tunnel coordinates...
September 1, 2017: Knee Surgery & related Research
https://www.readbyqxmd.com/read/28854522/an-investigation-on-effects-of-amputee-s-physiological-parameters-on-maximum-pressure-developed-at-the-prosthetic-socket-interface-using-artificial-neural-network
#19
Chitresh Nayak, Amit Singh, Himanshu Chaudhary, Deepak Rajendra Unune
Technological advances in prosthetics have attracted the curiosity of researchers in monitoring design and developments of the sockets to sustain maximum pressure without any soft tissue damage, skin breakdown, and painful sores. Numerous studies have been reported in the area of pressure measurement at the limb/socket interface, though, the relation between amputee's physiological parameters and the pressure developed at the limb/socket interface is still not studied. Therefore, the purpose of this work is to investigate the effects of patient-specific physiological parameters viz...
August 1, 2017: Technology and Health Care: Official Journal of the European Society for Engineering and Medicine
https://www.readbyqxmd.com/read/28840144/transtibial-versus-anteromedial-portal-acl-reconstruction-is-a-hybrid-approach-the-best
#20
Jonathan K Jennings, Daniel P Leas, James E Fleischli, Donald F D'Alessandro, Richard D Peindl, Dana P Piasecki
BACKGROUND: Improved biomechanical and clinical outcomes are seen when the femoral tunnels of the anterior cruciate ligament (ACL) are placed in the center of the femoral insertion. The transtibial (TT) technique has been shown to be less capable of this than an anteromedial (AM) portal approach but is more familiar to surgeons and less technically challenging. A hybrid transtibial (HTT) technique using medial portal guidance of a transtibial guide wire without knee hyperflexion may offer anatomic tunnel placement while maintaining the relative ease of a TT technique...
August 2017: Orthopaedic Journal of Sports Medicine
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