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Kinematic alignment

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https://www.readbyqxmd.com/read/28410594/physical-human-robot-interaction-of-an-active-pelvis-orthosis-toward-ergonomic-assessment-of-wearable-robots
#1
Nicolò d'Elia, Federica Vanetti, Marco Cempini, Guido Pasquini, Andrea Parri, Marco Rabuffetti, Maurizio Ferrarin, Raffaele Molino Lova, Nicola Vitiello
BACKGROUND: In human-centered robotics, exoskeletons are becoming relevant for addressing needs in the healthcare and industrial domains. Owing to their close interaction with the user, the safety and ergonomics of these systems are critical design features that require systematic evaluation methodologies. Proper transfer of mechanical power requires optimal tuning of the kinematic coupling between the robotic and anatomical joint rotation axes. We present the methods and results of an experimental evaluation of the physical interaction with an active pelvis orthosis (APO)...
April 14, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28407572/synthesis-and-viscoelastic-characterization-of-microstructurally-aligned-silk-fibroin-sponges
#2
Debojyoti Panda, Subhajit Konar, Saumendra K Bajpai, A Arockiarajan
Silk fibroin (SF) is a model candidate for use in tissue engineering and regenerative medicine owing to its bio-compatible mechanochemical properties. Despite numerous advances made in the fabrication of various biomimetic substrates using SF, relatively few clinical applications have been designed, primarily due to the lack of complete understanding of its constitutive properties. Here we fabricate microstructurally aligned SF sponge using the unidirectional freezing technique wherein a novel solvent-processing technique involving Acetic acid is employed, which obviates the post-treatment of the sponges to induce their water-stability...
March 28, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28384608/segmental-kinematic-analysis-of-planovalgus-feet-during-walking-in-children-with-cerebral-palsy
#3
Karen M Kruger, Katherine A Konop, Joseph J Krzak, Adam Graf, Haluk Altiok, Peter A Smith, Gerald F Harris
Pes planovalgus (flatfoot) is a common deformity among children with cerebral palsy. The Milwaukee Foot Model (MFM), a multi-segmental kinematic foot model, which uses radiography to align the underlying bony anatomy with reflective surface markers, was used to evaluate 20 pediatric participants (30feet) with planovalgus secondary to cerebral palsy prior to surgery. Three-dimensional kinematics of the tibia, hindfoot, forefoot, and hallux segments are reported and compared to an age-matched control set of typically-developing children...
March 23, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28373138/the-influence-of-spine-hip-relations-on-total-hip-replacement-a-systematic-review
#4
REVIEW
Charles Rivière, Jean-Yves Lazennec, Catherine Van Der Straeten, Edouard Auvinet, Justin Cobb, Sarah Muirhead-Allwood
BACKGROUD: Sagittal pelvic kinematics along with spino-pelvic angular parameters have recently been studied by numerous investigators for their effect on Total Hip Replacement (THR) clinical outcomes, but many issue of spine hip relations (SHR) are currently unexplored. Therefore, our review aims at clarifying the following questions: 1) Is there any evidence of a relationship between articular impingement/dislocation risk in primary THR, 2) and certain sagittal pelvic kinematics patterns, 3) pelvic incidence, and 4) types of SHRs? METHODS: A systematic review of the existing literature utilising PubMed and Google search engines was performed in January 2017...
March 31, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28371739/immediate-effects-of-shoes-inducing-ankle-destabilization-around-henke-s-axis-during-challenging-walking-gaits-gait-kinematics-and-peroneal-muscles-activities
#5
Lilian Fautrelle, Alexandre Kubicki, Nicolas Babault, Christos Paizis
Due to its high frequency of occurrence, as well as possible residual symptoms, proper treatment of lateral ankle sprains (LAS) is important. From a physiological point of view, increasing the quantity of electromyographic (EMG) activity in the peroneal muscles will mechanically improve the functional stability of the ankle joint. The present study investigated the immediate effects of an ankle destabilization device (ADD) specifically designed to induce imbalances along the Henke's axis during 3 challenging walking tasks...
March 23, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28364964/leaving-residual-varus-alignment-after-total-knee-arthroplasty-does-not-improve-patient-outcomes
#6
R Michael Meneghini, Tanner W Grant, Marshall K Ishmael, Mary Ziemba-Davis
BACKGROUND: Recent popularity of kinematic alignment and constitutional varus has caused some surgeons to leave varus limbs in residual varus after total knee arthroplasty (TKA). This study assessed whether if patients left in residual varus have improved outcomes compared with those fully corrected to neutral alignment. METHODS: A retrospective review of 361 consecutive primary TKAs was performed. Anatomic tibiofemoral alignment was measured and knees were categorized as neutral, varus, or valgus...
March 2, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28361018/spinal-alignment-evolution-with-age-a-prospective-gait-analysis-study
#7
Sébastien Pesenti, Benjamin Blondel, Emilie Peltier, Elke Viehweger, Vincent Pomero, Guillaume Authier, Stéphane Fuentes, Jean-Luc Jouve
AIM: To describe, using gait analysis, the development of spinal motion in the growing child. METHODS: Thirty-six healthy children aged from 3 to 16 years old were included in this study for a gait analysis (9 m-walk). Various kinematic parameters were recorded and analyzed such as thoracic angle (TA), lumbar angle (LA) and sagittal vertical axis (SVA). The kinetic parameters were the net reaction moments (N.m/kg) at the thoracolumbar and lumbosacral junctions. RESULTS: TA and LA curves were not statistically correlated to the age (respectively, P = 0...
March 18, 2017: World Journal of Orthopedics
https://www.readbyqxmd.com/read/28356640/fatigue-influences-lower-extremity-angular-velocities-during-a-single-leg-drop-vertical-jump
#8
Akihiro Tamura, Kiyokazu Akasaka, Takahiro Otsudo, Junya Shiozawa, Yuka Toda, Kaori Yamada
[Purpose] Fatigue alters lower extremity landing strategies and decreases the ability to attenuate impact during landing. The purpose of this study was to reveal the influence of fatigue on dynamic alignment and joint angular velocities in the lower extremities during a single leg landing. [Subjects and Methods] The 34 female college students were randomly assigned to either the fatigue or control group. The fatigue group performed single-leg drop vertical jumps before, and after, the fatigue protocol, which was performed using a bike ergometer...
March 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28341278/early-outcomes-of-kinematic-alignment-in-primary-total-knee-arthroplasty-a-meta-analysis-of-the-literature
#9
P Maxwell Courtney, Gwo-Chin Lee
BACKGROUND: Kinematic alignment in total knee arthroplasty (TKA) seeks to more anatomically align the knee prosthesis to promote more physiological kinematics. However, there are questions about the durability, function, and complication rate of a non-mechanically aligned TKA. Therefore, the purpose of this study is to perform a systematic review and meta-analysis to evaluate early outcomes after kinematic alignment. METHODS: Two independent reviewers performed a systematic review of the English literature using both the MEDLINE and Embase databases searching for studies on kinematic TKA...
February 27, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28339477/six-degree-of-freedom-knee-joint-kinematics-in-obese-individuals-with-knee-pain-during-gait
#10
Jing-Sheng Li, Tsung-Yuan Tsai, David T Felson, Guoan Li, Cara L Lewis
Knee joint pain is a common symptom in obese individuals and walking is often prescribed as part of management programs. Past studies in obese individuals have focused on standing alignment and kinematics in the sagittal and coronal planes. Investigation of 6 degree-of-freedom (6DOF) knee joint kinematics during standing and gait is important to thoroughly understand knee function in obese individuals with knee pain. This study aimed to investigate the 6DOF knee joint kinematics in standing and during gait in obese patients using a validated fluoroscopic imaging system...
2017: PloS One
https://www.readbyqxmd.com/read/28337549/perceptual-impressions-of-causality-are-affected-by-common-fate
#11
Peter A White
Many studies of perceptual impressions of causality have used a stimulus in which a moving object (the launcher) contacts a stationary object (the target) and the latter then moves off. Such stimuli give rise to an impression that the launcher makes the target move. In the present experiments, instead of a single target object, an array of four vertically aligned objects was used. The launcher contacted none of them, but stopped at a point between the two central objects. The four objects then moved with similar motion properties, exhibiting the Gestalt property of common fate...
March 24, 2017: Psychological Research
https://www.readbyqxmd.com/read/28332404/conceptual-design-and-implantation-of-an-external-fixator-with-improved-mobility-for-knee-rehabilitation
#12
Gianluca Gatti
A hinged external fixator is used to allow early knee rehabilitation in case of injury or trauma, as an alternative approach to immobilization. It is mainly adopted for the treatment of dislocations, which involve tearing of the ligaments, and it basically consists of two links connected to each other by a revolute joint. Each link is fixed to the femur and tibia via pin fixation, and the revolute joint is approximately aligned to the knee flexion-extension (FE) axis. The advantage in its implantation is to protect ligament reconstruction, while allowing for an aggressive rehabilitation...
March 23, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28302462/the-impact-of-mechanical-and-restricted-kinematic-alignment-on-knee-anatomy-in-total-knee-arthroplasty
#13
Abdulaziz M Almaawi, Jonathan R B Hutt, Vincent Masse, Martin Lavigne, Pascal-Andre Vendittoli
BACKGROUND: Total knee arthroplasty (TKA), aiming at neutral mechanical alignment (MA), inevitably modifies the patient's native knee anatomy. Another option is kinematic alignment (KA), which aims to restore the original anatomy of the knee. The aim of this study was to evaluate the variations in lower limb anatomy of a patient population scheduled for TKA, and to assess the use of a restricted KA TKA protocol and compare the resulting anatomic modifications with the standard MA technique...
February 20, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28284572/an-articulated-ankle-foot-orthosis-with-adjustable-plantarflexion-resistance-dorsiflexion-resistance-and-alignment-a-pilot-study-on-mechanical-properties-and-effects-on-stroke-hemiparetic-gait
#14
Toshiki Kobayashi, Michael S Orendurff, Grace Hunt, Lucas S Lincoln, Fan Gao, Nicholas LeCursi, K Bo Foreman
Mechanical properties of an articulated ankle-foot orthosis (AFO) are closely related to gait performance in individuals post-stroke. This paper presents a pilot study on the mechanical properties of a novel articulated AFO with adjustable plantarflexion resistance, dorsiflexion resistance and alignment, and its effect on ankle and knee joint kinematics and kinetics in an individual post-stroke during gait. The mechanical properties of the AFO were quantified. Gait analysis was performed using a 3D motion capture system with a split-belt instrumented treadmill under 12 different settings of the mechanical properties of the AFO [i...
March 8, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28278135/the-influence-of-the-unaffected-hip-on-gait-kinematics-in-patients-with-hemiplegic-cerebral-palsy
#15
Mikhail Tretiakov, Khanh P Do, Michael Aiona
BACKGROUND: Hemiplegic cerebral palsy (HCP) patients have transverse-plane gait deviations that may include the "uninvolved" side. The aim of this study is to quantify the static rotational profile, the dynamic position during gait and determine whether any correlations between the involved and uninvolved side exist. METHODS: A total of 171 subjects that met the inclusion criteria of HCP and no prior history of bony surgery were reviewed. Clinical and gait measurements were analyzed and compared between subjects and a population of typically developing (TD) children...
April 2017: Journal of Pediatric Orthopedics
https://www.readbyqxmd.com/read/28258640/realistic-kinetic-loading-of-the-jaw-system-during-single-chewing-cycles-a-finite-element-study
#16
S E Martinez Choy, J Lenz, K Schweizerhof, M Schmitter, H J Schindler
Although knowledge of short-range kinetic interactions between antagonistic teeth during mastication is of essential importance for ensuring interference-free fixed dental reconstructions, little information is available. In this study, the forces on and displacements of the teeth during kinetic molar biting simulating the power stroke of a chewing cycle were investigated by use of a finite-element model that included all the essential components of the human masticatory system, including an elastic food bolus...
March 4, 2017: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/28257426/effects-of-different-medial-arch-support-heights-on-rearfoot-kinematics
#17
Gunnar Wahmkow, Michael Cassel, Frank Mayer, Heiner Baur
BACKGROUND: Foot orthoses are usually assumed to be effective by optimizing mechanically dynamic rearfoot configuration. However, the effect from a foot orthosis on kinematics that has been demonstrated scientifically has only been marginal. The aim of this study was to examine the effect of different heights in medial arch-supported foot orthoses on rear foot motion during gait. METHODS: Nineteen asymptomatic runners (36±11years, 180±5cm, 79±10kg; 41±22km/week) participated in the study...
2017: PloS One
https://www.readbyqxmd.com/read/28254637/anticipatory-postural-adjustment-during-self-initiated-cued-and-compensatory-stepping-in-healthy-elderly-and-patients-with-parkinson-s-disease
#18
Christian Schlenstedt, Martina Mancini, Fay Horak, Daniel Peterson
OBJECTIVE: To characterize anticipatory postural adjustments (APA) across a variety of step initiation tasks in people with Parkinson's disease (PD) and healthy control (HC). DESIGN: Cross-sectional study. Step initiation was analyzed during a) self-initiated gait, b) perceptual cued gait, and c) compensatory forward stepping after platform perturbation. People with PD were assessed On and Off levodopa. SETTING: University research laboratory...
February 27, 2017: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/28249512/design-of-a-novel-5-dof-flexure-based-compound-alignment-stage-for-roll-to-roll-printed-electronics
#19
Weihai Chen, Shang Yang, Jingmeng Liu, Wenjie Chen, Yan Jin
Alignment stage is a pivotal component for Roll-to-Roll Printed Electronic (R2RPE), especially for Roll-to-Roll inkjet printing. This paper presents the design, modeling, and testing of a new flexure-based compound alignment stage for R2RPE. In this design, the alignment stage has 5-DOF (Degree of Freedom) motions for compensating the alignment errors and only the rotation motion about the y-axis is redundant. The stage is constructed in series by four key parts and adopts a compounded flexure structure to achieve a great performance...
February 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28242570/roussouly-s-sagittal-spino-pelvic-morphotypes-as-determinants-of-gait-in-asymptomatic-adult-subjects
#20
Ziad Bakouny, Ayman Assi, Abir Massaad, Elie Saghbini, Virginie Lafage, Wafa Skalli, Ismat Ghanem, Gaby Kreichati
Sagittal alignment is known to greatly vary between asymptomatic adult subjects; however, there are no studies on the possible effect of these differences on gait. The aim of this study is to investigate whether asymptomatic adults with different Roussouly sagittal alignment morphotypes walk differently. Ninety-one asymptomatic young adults (46M & 45W), aged 21.6±2.2years underwent 3D gait analysis and full body biplanar X-rays with three-dimensional (3D) reconstructions of their spines and pelvises and generation of sagittal alignment parameters...
February 22, 2017: Gait & Posture
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