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https://www.readbyqxmd.com/read/28227967/a-stimulation-driven-exoskeleton-for-walking-after-paraplegia
#1
Sarah R Chang, Mark J Nandor, Lu Li, Kevin M Foglyano, John R Schnellenberger, Rudi Kobetic, Roger D Quinn, Ronald J Triolo, Sarah R Chang, Mark J Nandor, Lu Li, Kevin M Foglyano, John R Schnellenberger, Rudi Kobetic, Roger D Quinn, Ronald J Triolo, Mark J Nandor, Rudi Kobetic, Roger D Quinn, John R Schnellenberger, Sarah R Chang, Kevin M Foglyano, Lu Li, Ronald J Triolo
An untethered version of a stimulation-driven exoskeleton was evaluated for its ability to restore walking after paralysis from spinal cord injury. The hybrid neuroprosthesis (HNP) combined a passive variable-constraint exoskeleton for stability and support with functional neuromuscular stimulation (FNS) to contract the paralyzed muscles to drive limb movement. This self-contained HNP was operated by an onboard controller that sampled sensor signals, generated appropriate commands to both the exoskeletal constraints and integrated stimulator, and transmitted data wirelessly via Bluetooth to an off-board computer for real-time monitoring and recording for offline analysis...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226945/transferring-knowledge-during-dyadic-interaction-the-role-of-the-expert-in-the-learning-process
#2
Edwin Johnatan Avila Mireles, Dalia De Santis, Pietro Morasso, Jacopo Zenzeri, Edwin Johnatan Avila Mireles, Dalia De Santis, Pietro Morasso, Jacopo Zenzeri, Jacopo Zenzeri, Pietro Morasso, Edwin Johnatan Avila Mireles, Dalia De Santis
Physical interaction between man and machines is increasing the interest of the research as well as the industrial community. It is known that physical coupling between active persons can be beneficial and increase the performance of the dyad compared to an individual. However, the factors that may result in performance benefits are still poorly understood. The aim of this work is to investigate how the different initial skill levels of the interacting partners influence the learning of a stabilization task...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226426/physiological-mechanisms-for-stabilizing-the-limb-when-acting-against-physical-constraints
#3
P Senot, L Damm, M Tagliabue, J McIntyre, P Senot, L Damm, M Tagliabue, J McIntyre, P Senot, L Damm, M Tagliabue, J McIntyre
Smooth physical interaction with our environment, such as when working with tools, requires adaptability to unpredictable perturbations that can be achieved through impedance control of multi-joint limbs. Modulation of arm stiffness can be achieved either increasing co-contraction of antagonistic muscles or by increasing the gain of spinal reflex loops. According to the "automatic gain scaling" principle, the spinal reflex gain, as measured via the H-reflex, scales with muscle activation. A previous experiment from our labs suggested, however, that reflex gains might instead be scaled to the force exerted by the limb, perhaps as a means to counteract destabilizing external forces...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28224248/vis-nir-spectroscopy-with-moving-window-pls-method-applied-to-rapid-analysis-of-whole-blood-viscosity
#4
Jiemei Chen, Zhiwei Yin, Yi Tang, Tao Pan
A rapid analytical method of human whole blood viscosity with low, medium, and high shear rates [WBV(L), WBV(M), and WBV(H), respectively] was developed using visible and near-infrared (Vis-NIR) spectroscopy combined with a moving-window partial least squares (MW-PLS) method. Two groups of peripheral blood samples were collected for modeling and validation. Separate analytical models were established for male and female groups to avoid interference in different gender groups and improve the homogeneity and prediction accuracy...
February 21, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28224064/anterior-horn-meniscal-repair-using-an-outside-in-suture-technique
#5
Travis J Menge, Chase S Dean, Jorge Chahla, Justin J Mitchell, Robert F LaPrade
The menisci are important structures within the knee that play a critical role in maintaining proper stability, load distribution, and joint lubrication. Injury to the menisci has been found to significantly alter the complex biomechanics of the knee, and thus affect the health and longevity of the native joint. Tears involving the anterior horn are increasingly recognized as an important pathology. Although early treatment of meniscal tears focused primarily on removal of the injured tissue, recent attention on the long-term consequences of partial or total meniscectomy has led to increased attempts at meniscus repair whenever possible...
October 2016: Arthroscopy Techniques
https://www.readbyqxmd.com/read/28222947/comparison-of-the-effectiveness-of-three-different-treatment-methods-for-temporomandibular-joint-disc-displacement-without-reduction
#6
U Tatli, M E Benlidayi, O Ekren, F Salimov
The aim of this study was to compare the effectiveness of three treatment methods for unilateral temporomandibular joint (TMJ) disc displacement without reduction (DDwoR). One hundred and twenty patients with unilateral TMJ DDwoR were assigned randomly to one of three treatment groups (40 patients in each): group 1 received arthrocentesis, group 2 received stabilization splint therapy following arthrocentesis, and group 3 received splint therapy only. The groups were compared in terms of pain (visual analogue scale), joint function (maximum mouth opening and laterotrusive movements), disability and psychological status (validated questionnaire), and success rates...
February 17, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28220401/numerical-model-for-healthy-and-injured-ankle-ligaments
#7
Antonella Forestiero, Emanuele Luigi Carniel, Chiara Giulia Fontanella, Arturo Nicola Natali
The aim of this work is to provide a computational tool for the investigation of ankle mechanics under different loading conditions. The attention is focused on the biomechanical role of ankle ligaments that are fundamental for joints stability. A finite element model of the human foot is developed starting from Computed Tomography and Magnetic Resonance Imaging, using particular attention to the definition of ankle ligaments. A refined fiber-reinforced visco-hyperelastic constitutive model is assumed to characterize the mechanical response of ligaments...
February 20, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28220268/anterolateral-ligament-expert-group-consensus-paper-on-the-management-of-internal-rotation-and-instability-of-the-anterior-cruciate-ligament-deficient-knee
#8
REVIEW
Bertrand Sonnery-Cottet, Matthew Daggett, Jean-Marie Fayard, Andrea Ferretti, Camilo Partezani Helito, Martin Lind, Edoardo Monaco, Vitor Barion Castro de Pádua, Mathieu Thaunat, Adrian Wilson, Stefano Zaffagnini, Jacco Zijl, Steven Claes
Purpose of this paper is to provide an overview of the latest research on the anterolateral ligament (ALL) and present the consensus of the ALL Expert Group on the anatomy, radiographic landmarks, biomechanics, clinical and radiographic diagnosis, lesion classification, surgical technique and clinical outcomes. A consensus on controversial subjects surrounding the ALL and anterolateral knee instability has been established based on the opinion of experts, the latest publications on the subject and an exchange of experiences during the ALL Experts Meeting (November 2015, Lyon, France)...
February 20, 2017: Journal of Orthopaedics and Traumatology: Official Journal of the Italian Society of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/28219307/comparative-evaluation-of-posterior-cruciate-ligament-in-total-knee-arthroplasty
#9
Yuan Ma, Wei-Jia Chen, Ryuji Nagamine
INTRODUCTION: It has been realized that for osteoarthritis (OA) knee with varus deformity, posterior cruciate ligament (PCL) release resulted in the increase of the flexion gap without significant effect on the extension gap. While the effect of release on gap angle is still obscure. On the other hand, gap distance and varus angle measured under different distraction forces suggest different patterns. OBJECTIVES: In the current study, mechanical gap balance in displacement and angular alternation of extension and flexion gaps will be evaluated, with PCL fully retained or resected under different distracting forces in varus knees...
January 2017: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/28217660/reverse-total-shoulder-arthroplasty-research-models
#10
Stefano Petrillo, Umile Giuseppe Longo, Lawrence V Gulotta, Alessandra Berton, Andreas Kontaxis, Timothy Wright, Vincenzo Denaro
PURPOSE: the past decade has seen a considerable increase in the use of research models to study reverse total shoulder arthroplasty (RTSA). Nevertheless, none of these models has been shown to completely reflect real in vivo conditions. METHODS: we performed a systematic review of the literature matching the following key words: "reverse total shoulder arthroplasty" or "reverse total shoulder replacement" or "reverse total shoulder prosthesis" and "research models" or "biomechanical models" or "physical simulators" or "virtual simulators"...
October 2016: Joints
https://www.readbyqxmd.com/read/28217426/treatment-of-anterior-shoulder-subluxation-using-the-mulligan-concept-and-reflex-neuromuscular-stabilization-a-case-report
#11
Robinetta A Hudson, Russell T Baker, Alan Nasypany, Don Reordan
BACKGROUND AND PURPOSE: Shoulder instability, a common issue among athletes who engage in contact sports, may lead to recurrent subluxations, or partial dislocations of the shoulder. Young athletic patients generally respond poorly to the nonsurgical treatments for shoulder instability that are commonly utilized. The purpose of this case report is to describe the effects of the treatment guided by the Mulligan Concept (MC) coupled with reflex neuromuscular stabilization (RNS) also known as reactive neuromuscular training (RNT), on an adolescent football player with glenohumeral joint (GHJ) instability who sustained a traumatic anterior subluxation...
February 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28217415/muscle-activation-patterns-during-suspension-training-exercises
#12
Sean Harris, Elise Ruffin, Wayne Brewer, Alexis Ortiz
BACKGROUND: Suspension training (ST) has been utilized over exercises performed on a stable surface to train multiple muscle groups simultaneously to increase muscle activation and joint stability. HYPOTHESIS/PURPOSE: The purpose of this study was to determine whether ST augments muscle activation compared to similar exercises performed on a stable surface. STUDY DESIGN: Cross-sectional study. METHODS: Twenty-five healthy adults (male: 16; women: 9; BMI: 23...
February 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28216399/minimally-invasive-sacroiliac-joint-fusion-using-a-novel-hydroxyapatite-coated-screw-preliminary-1-year-clinical-and-radiographic-results-of-a-2-year-prospective-study
#13
Louis H Rappoport, Ingrid Y Luna, Gita Joshua
OBJECTIVE: Proper diagnosis and treatment of sacroiliac joint (SIJ) pain remains a clinical challenge. Dysfunction of SIJ can produce pain in the lower back, buttocks, and extremities. Triangular titanium implants for minimally invasive surgical arthrodesis have been available for several years with reputed high levels of success and patient satisfaction. This study reports on a novel hydroxyapatite-coated screw for surgical treatment of SIJ pain. METHODS: Data were prospectively collected on 32 consecutive patients who underwent minimally invasive SIJ fusion with a novel hydroxyapatite-coated screw...
February 16, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28212251/serum-mast-cell-tryptase-as-a-marker-of-posttraumatic-joint-contracture-in-a-rabbit-model
#14
Michaela Kopka, Michael J Monument, A Dean Befus, Mei Zhang, David A Hart, Paul T Salo, Prism S Schneider, Cun-Yi Fan, Xiangdang Liang, Alexandra Garven, Kevin A Hildebrand
OBJECTIVES: Mast cells have been identified as key mediators of posttraumatic joint contracture, and stabilizing medications (ketotifen) have been shown to decrease contracture severity. Serum mast cell tryptase (SMCT) levels are used clinically to monitor mast cell-mediated conditions. The goals of this study were to determine if SMCT levels are elevated in the setting of joint contracture, if they can be decreased in association with ketotifen therapy, and if they correlate with contracture severity...
March 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28211292/clinical-and-functional-outcome-of-open-primary-repair-of-triangular-fibrocartilage-complex-tears-associated-with-distal-radius-fractures
#15
Faisal Johandi, Sreedharan Sechachalam
PURPOSE: We evaluate the clinical and functional outcome of open primary repair of acute TFCC tears in distal radius fracture, when there is gross intraoperative distal radioulnar joint (DRUJ) instability after fixation of the distal radius, in the absence of an ulnar styloid fracture or when the ulnar fracture fragment is too small to be fixed. METHODS: A retrospective review of our institution's distal radius fracture database over a 4-year period (January 2010 to December 2013)...
January 2017: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/28210644/axial-plane-biomechanical-evaluation-of-2-suspensory-cortical-button-fixation-constructs-for-acromioclavicular-joint-reconstruction
#16
REVIEW
Steven Struhl, Theodore S Wolfson, Frederick Kummer
BACKGROUND: Although numerous suture-button fixation techniques for acromioclavicular (AC) joint reconstruction have been validated with biomechanical testing in the superior direction, clinical reports continue to demonstrate high rates of construct slippage and breakage. PURPOSE: To compare the stability of a novel closed-loop double Endobutton construct with a commercially available cortical button system in both the axial and superior directions. STUDY DESIGN: Controlled laboratory study...
December 2016: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28208055/fate-of-the-coronoid-process-after-coronoidotomy-and-its-effect-on-the-interincisal-opening-a-clinical-and-radiologic-assessment
#17
Sujata Mohanty, Sanchaita Kohli, Jitender Dabas, Rudra Deo Kumar, Ranjeet Bodh, Sandeep Yadav
PURPOSE: Coronoidotomy is used to treat several conditions, including coronoid hyperplasia and temporomandibular joint (TMJ) ankylosis. The stability of the outcome, however, is considered questionable because of the risk of reattachment of the coronoid process. This study aims to radiographically and clinically evaluate the long-term anatomic and physiological outcome after coronoidotomy. MATERIALS AND METHODS: In 17 patients with unilateral TMJ ankylosis, 25 coronoidotomies were performed as an additional maneuver to relieve trismus after ankylosis release...
January 20, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28207656/biomechanical-evaluation-of-transpedicular-nucleotomy-with-intact-annulus-fibrosus
#18
Fabrizio Russo, Robert A Hartman, Kevin M Bell, Nam Vo, Gwendolyn A Sowa, James D Kang, Gianluca Vadalà, Vincenzo Denaro
STUDY DESIGN: Biomechanical testing of partially nucleotomized ovine cadaveric spines. OBJECTIVE: To explore how the nucleus pulposus (NP) affects the biomechanical behavior of the intervertebral disc (IVD) by performing a partial nucleotomy via the transpedicular approach. SUMMARY OF BACKGROUND DATA: Mechanical loading represents a crucial part of IVD homeostasis. However, traditional regenerative strategies require violation of the annulus fibrosus (AF) resulting in significant alteration of joint mechanics...
February 15, 2017: Spine
https://www.readbyqxmd.com/read/28205480/extensor-tendon-instability-due-to-sagittal-band-injury-in-a-martial-arts-athlete-a-case-report
#19
Andrew Kochevar, Ghazi Rayan
A Taekwondo participant sustained a hand injury from punching an opponent that resulted in painful instability of the ring finger extensor digitorum communis tendon due to sagittal band damage. His symptoms resolved after reconstructive surgery on the sagittal band (SB) with stabilization of the extensor tendon over the metacarpophalangeal joint.
March 2017: Journal of Hand Surgery Asian-Pacific Volume
https://www.readbyqxmd.com/read/28205465/biomechanics-of-internal-fixation-modalities-for-middle-phalangeal-base-fracture-dislocation
#20
Gen-Lin Foo, Amit K Ramruttun, Andre Eujin Cheah, Alphonsus Kin-Sze Chong, Tun-Lin Foo
BACKGROUND: Internal fixation modalities of unstable (>50 percent articular involvement) middle phalangeal volar lip fracture-dislocations include interfragmentary screw and volar buttress plating. This study investigates the mechanical properties (yield strength, ultimate tensile strength, and stiffness) of interfragmentary screw (IS), simple buttress plating (BP) and buttress plating with subchondral screw (BP+S). METHODS: Fifteen cadaveric digits (5 index, 5 middle, and 5 ring) were prepared by excising its skin envelope and flexor tendons while preserving the structures around the proximal interphalangeal joint...
March 2017: Journal of Hand Surgery Asian-Pacific Volume
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