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Biomechanic

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https://www.readbyqxmd.com/read/29452282/load-sharing-through-elastic-micro-motion-accelerates-bone-formation-and-interbody-fusion
#1
Eric H Ledet, Glenn P Sanders, Darryl J DiRisio, Joseph C Glennon
BACKGROUND: Context: Achieving a successful spinal fusion requires the proper biologic and biomechanical environment. Optimizing load-sharing in the interbody space can enhance bone formation. For anterior cervical discectomy and fusion (ACDF), loading and motion are largely dictated by the stiffness of the plate which can facilitate a balance between stability and load-sharing. The advantages of load-sharing may be substantial for patients with comorbidities and in multi-level procedures where pseudarthrosis rates are significant...
February 13, 2018: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/29452273/3d-bioprinted-functional-and-contractile-cardiac-tissue-constructs
#2
Zhan Wang, Sang Jin Lee, Heng-Jie Cheng, James J Yoo, Anthony Atala
Bioengineering of a functional cardiac tissue composed of primary cardiomyocytes has great potential for myocardial regeneration and in vitro tissue modeling. However, its applications remain limited because the cardiac tissue is a highly organized structure with unique physiologic, biomechanical, and electrical properties. In this study, we undertook a proof-of-concept study to develop a contractile cardiac tissue with cellular organization, uniformity, and scalability by using three-dimensional (3D) bioprinting strategy...
February 13, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29451935/economic-analysis-of-anatomic-plating-versus-tubular-plating-for-the-treatment-of-fibula-fractures
#3
Gerard Chang, Suneel B Bhat, Steven M Raikin, Justin M Kane, Andrew Kay, Jamal Ahmad, David I Pedowitz, James Krieg
Ankle fractures are among the most common injuries requiring operative management. Implant choices include one-third tubular plates and anatomically precontoured plates. Although cadaveric studies have not revealed biomechanical differences between various plate constructs, there are substantial cost differences. This study sought to characterize the economic implications of implant choice. A retrospective review was undertaken of 201 consecutive patients with operatively treated OTA type 44B and 44C ankles...
February 16, 2018: Orthopedics
https://www.readbyqxmd.com/read/29451877/influence-of-hyperbaric-oxygen-on-biomechanics-and-structural-bone-matrix-in-type-1-diabetes-mellitus-rats
#4
Pedro Henrique Justino Oliveira Limirio, Huberth Alexandre da Rocha Junior, Richarlisson Borges de Morais, Karen Renata Nakamura Hiraki, Ana Paula Coelho Balbi, Priscilla Barbosa Ferreira Soares, Paula Dechichi
BACKGROUND: The aim of this study was to evaluate the biomechanics and structural bone matrix in diabetic rats subjected to hyperbaric oxygen therapy (HBO). METHODS: Twenty-four male rats were divided into the following groups: Control; Control + HBO; Diabetic, and Diabetic + HBO. Diabetes was induced with streptozotocin (STZ) in the diabetic Groups. After 30 days, HBO was performed every 48h in HBO groups and all animals were euthanized 60 days after diabetic induction...
2018: PloS One
https://www.readbyqxmd.com/read/29451741/non-invasive-optical-method-for-real-time-assessment-of-intracorneal-riboflavin-concentration-and-efficacy-of-corneal-cross-linking
#5
Giuseppe Lombardo, Valentina Villari, Norberto Liborio Micali, Nancy Leone, Cristina Labate, Maria Penelope De Santo, Marco Lombardo
Keratoconus is the primary cause of corneal transplantation in young adults worldwide. Riboflavin/UV-A corneal cross-linking may effectively halt the progression of keratoconus if an adequate amount of riboflavin enriches the corneal stroma and is photo-oxidated by UV-A light for generating additional cross-linking bonds between stromal proteins and strengthening the biomechanics of the weakened cornea. Here we reported a UV-A theranostic prototype device for performing corneal cross-linking with the ability to assess corneal intrastromal concentration of riboflavin and to estimate treatment efficacy in real time...
February 16, 2018: Journal of Biophotonics
https://www.readbyqxmd.com/read/29451436/novel-posterior-artificial-atlanto-odontoid-joint-for-atlantoaxial-instability-a-biomechanical-study
#6
Kai Shen, Zhongliang Deng, Junsong Yang, Chao Liu, Ranxi Zhang
OBJECTIVE Atlantoaxial instability is usually corrected by anterior and/or posterior C1-2 fusion. However, fusion can lead to considerable loss of movement at the C1-2 level, which can adversely impact a patient's quality of life. In this study, the authors investigated the stability and function of a novel posterior artificial atlanto-odontoid joint (NPAAJ) by using cadaveric cervical spines. METHODS The Oc-C7 regions from 10 cadaveric spines were used for anteroposterior (AP) translation and range of motion (ROM) tests while intact and after destabilization, NPAAJ implantation, and double-rod fixation...
February 16, 2018: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/29450826/return-to-throwing-after-shoulder-or-elbow-injury
#7
REVIEW
Terrance A Sgroi, John M Zajac
PURPOSE OF REVIEW: Throwing places high demands on the human body, and specific characteristics are developed over time unique to these athletes. When returning to throw after injury, it is important to follow a criterion-based progression that allows the body to be prepared appropriately for the stresses that throwing will require. There is currently a void in the literature for criteria-based progression that helps these athletes return to the highest level of play. RECENT FINDINGS: As injury rates continue to rise in baseball, there is increased evidence showing contributions of the core and lower extremity to the baseball pitch...
February 15, 2018: Current Reviews in Musculoskeletal Medicine
https://www.readbyqxmd.com/read/29450567/coronal-tibial-anteromedial-tunnel-location-has-minimal-effect-on-knee-biomechanics
#8
Shigehiro Asai, Donghwi Kim, Yuichi Hoshino, Chan-Woong Moon, Akira Maeyama, Monica Linde, Patrick Smolinski, Freddie H Fu
PURPOSE: Studies have found anatomic variation in the coronal position of the insertion site of anteromedial (AM) bundle of the anterior cruciate ligament (ACL) on the tibia, which can lead to questions about tunnel placement during ACL reconstruction. The purpose of this study was to determine how mediolateral placement of the tibial AM graft tunnel in double-bundle ACL reconstructions affects knee biomechanics. METHODS: Two different types of double-bundle ACL reconstructions were performed...
February 15, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29449764/the-effect-of-manual-therapy-and-neuroplasticity-education-on-chronic-low-back-pain-a-randomized-clinical-trial
#9
Adriaan Louw, Kevin Farrell, Merrill Landers, Martin Barclay, Elise Goodman, Jordan Gillund, Sara McCaffrey, Laura Timmerman
Objective: To determine if a neuroplasticity educational explanation for a manual therapy technique will produce a different outcome compared to a traditional mechanical explanation. Methods: Sixty-two patients with chronic low back pain (CLBP) were recruited for the study. Following consent, demographic data were obtained as well as pain ratings for low back pain (LBP) and leg pain (Numeric Pain Rating Scale), disability (Oswestry Disability Index), fear-avoidance (Fear-Avoidance-Beliefs Questionnaire), forward flexion (fingertips-to-floor), and straight leg raise (SLR) (inclinometer)...
December 2017: Journal of Manual & Manipulative Therapy
https://www.readbyqxmd.com/read/29449041/biomechanical-simulation-of-traumatic-brain-injury-in-the-rat
#10
REVIEW
John D Finan
BACKGROUND: Traumatic brain injury poses an enormous clinical challenge. Rats are the animals most widely used in pre-clinical experiments. Biomechanical simulations of these experiments predict the distribution of mechanical stress and strain across key tissues. It is in theory possible to dramatically increase our understanding of traumatic brain injury pathophysiology by correlating stress and strain with histological and functional injury outcomes. This review summarizes the state of the art in biomechanical simulation of traumatic brain injury in the rat...
January 31, 2018: Clinical Biomechanics
https://www.readbyqxmd.com/read/29449003/upper-partial-fibulectomy-improves-knee-biomechanics-and-function-and-decreases-knee-pain-of-osteoarthritis-a-pilot-and-biomechanical-study
#11
Yong Nie, Jun Ma, ZeYu Huang, Bin Xu, Shuo Tang, Bin Shen, Virginia Byers Kraus, FuXing Pei
To investigate the change in clinical outcomes and biomechanical properties of the knee in response to upper partial fibulectomy. Sixteen patients with medial compartment knee osteoarthritis (KOA) underwent upper partial fibulectomy. Visual analog scale (VAS) pain, the hospital for special surgery knee score (HSS), hip-knee-ankle (HKA) angle (measured in the frontal plane), and flexion/extension range of motion of the knee were assessed before and up to 6 months after surgery. Patients were evaluated for gait parameters and overall peak knee adduction moment (KAM)...
December 13, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29448816/using-cartilage-mri-t2-mapping-to-analyze-early-cartilage-degeneration-in-the-knee-joint-of-young-professional-soccer-players
#12
Leonie Waldenmeier, Christoph Evers, Michael Uder, Rolf Janka, Frank Friedrich Hennig, Milena Liese Pachowsky, Götz Hannes Welsch
Objective To evaluate and characterize the appearance of articular cartilage in the tibiofemoral joint of young professional soccer players using T2-relaxation time evaluation on magnetic resonance imaging (MRI). Design In this study, we included 57 male adolescents from the youth academy of a professional soccer team. The MRI scans were acquired of the knee joint of the supporting leg. An "early unloading" (minute 0) and "late unloading" (minute 28) T2-sequence was included in the set of images...
February 1, 2018: Cartilage
https://www.readbyqxmd.com/read/29448221/trip-specific-training-enhances-recovery-after-large-postural-disturbances-for-which-there-is-expectation
#13
Simisola O Oludare, Mackenzie L Pater, Noah J Rosenblatt, Mark D Grabiner
PURPOSE: Informed consent usually provides foreknowledge of experimental methods that can potentially increase expectation of stimuli and, therefore, influence the response. We determined the effects of increased expectation and trip-specific training on the recovery response following a treadmill-delivered, trip-specific disturbance. To deliver unexpected disturbances, subjects were deceived during the informed consent process. The primary hypothesis was that the recovery response following an expected postural disturbance would be characterized by trunk kinematics that have been shown to decrease the likelihood of a fall, compared to following an unexpected postural disturbance...
February 5, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29447910/preventing-non-contact-acl-injuries-in-female-athletes-what-can-we-learn-from-dancers
#14
Catherine Turner, Sarah Crow, Thomas Crowther, Brittany Keating, Trenton Saupan, Jason Pyfer, Kimberly Vialpando, Szu-Ping Lee
OBJECTIVES: To investigate the effects of dance experience and movement instruction on lower extremity kinematics and muscle activation during a landing task. DESIGN: Cross-sectional case control. SETTING: Laboratory setting. PARTICIPANTS: 27 female subjects (age 18-25) in 2 groups: dancers (n = 12) and non-dancers (n = 15). MAIN OUTCOME MEASURES: Lower extremity biomechanics during drop landing were analyzed...
December 23, 2017: Physical Therapy in Sport
https://www.readbyqxmd.com/read/29447756/the-biomechanical-significance-of-the-frontal-sinus-in-kabwe-1-homo-heidelbergensis
#15
Ricardo Miguel Godinho, Paul O'Higgins
Paranasal sinuses are highly variable among living and fossil hominins and their function(s) are poorly understood. It has been argued they serve no particular function and are biological 'spandrels' arising as a structural consequence of changes in associated bones and/or soft tissue structures. In contrast, others have suggested that sinuses have one or more functions, in olfaction, respiration, thermoregulation, nitric oxide production, voice resonance, reduction of skull weight, and craniofacial biomechanics...
January 2018: Journal of Human Evolution
https://www.readbyqxmd.com/read/29447753/kinematics-of-the-anthropoid-os-centrale-and-the-functional-consequences-of-scaphoid-centrale-fusion-in-african-apes-and-hominins
#16
Caley M Orr
In most primates, the os centrale is interposed between the scaphoid, trapezoid, trapezium, and head of the capitate, thus constituting a component of the wrist's midcarpal complex. Scaphoid-centrale fusion is among the clearest morphological synapomorphies of African apes and hominins. Although it might facilitate knuckle-walking by increasing the rigidity and stability of the radial side of the wrist, the exact functional significance of scaphoid-centrale fusion is unclear. If fusion acts to produce a more rigid radial wrist that stabilizes the hand and limits shearing stresses, then in taxa with a free centrale, it should anchor ligaments that check extension and radial deviation, but exhibit motion independent of the scaphoid...
January 2018: Journal of Human Evolution
https://www.readbyqxmd.com/read/29447306/knotless-tape-suture-fixation-of-quadriceps-tendon-rupture-a-novel-technique
#17
James M Paci, Amanda Pawlak
Quadriceps tendon ruptures disrupt the extensor mechanism of the knee and require urgent surgical management. Traditional repair techniques have had mixed biomechanical and clinical results risking weakness and extensor lag. We describe a novel technique using tape suture and knotless anchors, which has performed superiorly during biomechanical testing and yielded terrific early clinical results.
January 2018: American Journal of Orthopedics
https://www.readbyqxmd.com/read/29447236/the-influence-of-a-change-in-the-meniscus-cross-sectional-shape-on-the-medio-lateral-translation-of-the-knee-joint-and-meniscal-extrusion
#18
Piotr Luczkiewicz, Karol Daszkiewicz, Wojciech Witkowski, Jacek Chróścielewski, Tomasz Ferenc, Boguslaw Baczkowski
OBJECTIVE: The purpose of this study was to evaluate the influence of a change in the meniscus cross sectional shape on its position and on the biomechanics of a knee joint. METHODS: One main finite element model of a left knee joint was created on the basis of MRI images. The model consisted of bones, articular cartilages, menisci and ligaments. Eight variants of this model with an increased or decreased meniscus height were then prepared. Nonlinear static analyses with a fixed flexion/extension movement for a compressive load of 1000 N were performed...
2018: PloS One
https://www.readbyqxmd.com/read/29447105/multi-muscle-electrical-stimulation-and-stand-training-effects-on-standing
#19
Kamyar Momeni, Arvind Ramanujam, Erica L Garbarini, Gail F Forrest
OBJECTIVE: To examine the biomechanical and neuromuscular effects of a longitudinal multi-muscle electrical stimulation (submaximal intensities) training of the lower limbs combined with/without activity-based stand training, on the recovery of stability and function for one individual with spinal cord injury (SCI). DESIGN: Single-subject, longitudinal study. SETTING: Neuroplasticity laboratory. PARTICIPANT: A 34-year-old male, with sensory- and motor-complete SCI (C5/C6)...
February 15, 2018: Journal of Spinal Cord Medicine
https://www.readbyqxmd.com/read/29447080/improved-lower-extremity-pedaling-mechanics-in-individuals-with-stroke-under-maximal-workloads
#20
Susan M Linder, Anson B Rosenfeldt, Andrew S Bazyk, Mandy Miller Koop, Sarah Ozinga, Jay L Alberts
Background Individuals with stroke present with motor control deficits resulting in the abnormal activation and timing of agonist and antagonist muscles and inefficient movement patterns. The analysis of pedaling biomechanics provides a window into understanding motor control deficits, which vary as a function of workload. Understanding the relationship between workload and motor control is critical when considering exercise prescription during stroke rehabilitation. Objectives To characterize pedaling kinematics and motor control processes under conditions in which workload was systematically increased to an eventual patient-specific maximum...
February 15, 2018: Topics in Stroke Rehabilitation
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