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https://www.readbyqxmd.com/read/29452734/calcar-screw-position-in-proximal-humerus-fracture-fixation-don-t-miss-high
#1
Samir Mehta, Matthew Chin, Jennifer Sanville, Surena Namdari, Michael W Hast
INTRODUCTION: In locked plate fixation of proximal humerus fractures, the calcar is an important anchor point for screws providing much-needed medial column support. Most locking plate implants utilize a fixed-trajectory locking screw to achieve this goal. Consequently, adjustments of plate location to account for patient-specific anatomy may result in a screw position outside of the calcar. To date, little is known about the consequences of "missing" the calcar during plate positioning...
February 11, 2018: Injury
https://www.readbyqxmd.com/read/29451877/influence-of-hyperbaric-oxygen-on-biomechanics-and-structural-bone-matrix-in-type-1-diabetes-mellitus-rats
#2
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/29450826/return-to-throwing-after-shoulder-or-elbow-injury
#3
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/29446183/comparison-of-detergent-based-decellularization-protocols-for-the-removal-of-antigenic-cellular-components-in-porcine-aortic-valve
#4
Xiaohong Liu, Ning Li, Dejun Gong, Cuiping Xia, Zhiyun Xu
BACKGROUND: Various detergent-based protocols are used to remove cells and cellular debris in porcine aortic valve (PAV). However, the removal of antigenic cellular components has not been thoroughly elucidated to date. In this study, we used 4 detergent-based protocols to decellularize PAVs and aimed to evaluate their effects on removing antigenic cellular components. METHODS: Porcine aortic valves were decellularized using sodium dodecyl sulfate (SDS), SDS in combination with sodium deoxycholate (SDS/SD), Triton X-100, and Triton X-100 in combination with SD (Triton X-100/SD), respectively...
February 15, 2018: Xenotransplantation
https://www.readbyqxmd.com/read/29445875/interference-screw-insertion-angle-has-no-effect-on-graft-fixation-strength-for-insertional-achilles-tendon-reconstruction
#5
Ziying Wu, Hongyun Li, Shiyi Chen, Kui Ma, Shengkun Li, Peng Zhang, Yinghui Hua
PURPOSE: To compare the effect of two interference screw insertion angles on the biomechanical properties of the insertional Achilles tendon (IAT) reconstruction. METHODS: Nine matched pairs of fresh-frozen human cadaveric Achilles tendon specimens were randomized to two groups with interference screw insertion angles of 60° and 120°. The IAT reconstruction was performed by fixing the graft tendon with the interference screw. Each specimen was loaded to failure...
February 14, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29442158/effects-of-human-parathyroid-hormone-1-34-on-bone-loss-and-lumbar-intervertebral-disc-degeneration-in-ovariectomized-rats
#6
Yang Luo, Shu-Yang Li, Fa-Ming Tian, Hui-Ping Song, Ying-Ze Zhang, Liu Zhang
PURPOSE: Lumbar intervertebral disc degeneration is a common cause of lower back pain that affects the physical and mental health of patients and increases social burden. Parathyroid hormone has been reported to be effective at inhibiting disc degeneration; however, these effects have not been fully established in vivo in ovariectomized (OVX) rats. Thus, in this study, we aimed to address this issue and examine the effects of parathyroid hormone treatment in OVX rats. METHODS: Thirty female Sprague-Dawley rats, three months-old, were subjected to sham or ovariectomy surgery...
February 13, 2018: International Orthopaedics
https://www.readbyqxmd.com/read/29439237/morphology-muscle-capacity-skill-and-maneuvering-ability-in-hummingbirds
#7
Roslyn Dakin, Paolo S Segre, Andrew D Straw, Douglas L Altshuler
How does agility evolve? This question is challenging because natural movement has many degrees of freedom and can be influenced by multiple traits. We used computer vision to record thousands of translations, rotations, and turns from more than 200 hummingbirds from 25 species, revealing that distinct performance metrics are correlated and that species diverge in their maneuvering style. Our analysis demonstrates that the enhanced maneuverability of larger species is explained by their proportionately greater muscle capacity and lower wing loading...
February 9, 2018: Science
https://www.readbyqxmd.com/read/29438658/functional-capacity-in-adults-with-cerebral-palsy-lower-limb-muscle-strength-matters
#8
Jarred G Gillett, Glen A Lichtwark, Roslyn N Boyd, Lee A Barber
OBJECTIVE: To investigate the relationship between lower limb muscle strength, passive muscle properties and functional capacity outcomes in adults with cerebral palsy (CP). DESIGN: Cross-sectional study. SETTING: Tertiary institution biomechanics laboratory. PARTICIPANTS: Sample of 33 adults with spastic-type CP with a mean age of 25 (range, 15-51) years; mean ± SD body mass 70.15 ± 21.35 kg; Gross Motor Function Classification System (GMFCS) level I n=20, level II n=13...
February 10, 2018: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/29438431/novel-animal-model-for-achilles-tendinopathy-controlled-experimental-study-of-serial-injections-of-collagenase-in-rabbits
#9
Cesar de Cesar Netto, Alexandre Leme Godoy-Santos, Pedro Augusto Pontin, Renato Jose Mendonça Natalino, Cesar Augusto Martins Pereira, Francisco Diego de Oliveira Lima, Lucas Furtado da Fonseca, Jackson Rucker Staggers, Leonardo Muntada Cavinatto, Lew Charles Schon, Olavo Pires de Camargo, Túlio Diniz Fernandes
Our goal was to develop a novel technique for inducing Achilles tendinopathy in animal models which more accurately represents the progressive histological and biomechanical characteristic of chronic Achilles tendinopathy in humans. In this animal research study, forty-five rabbits were randomly assigned to three groups and given bilateral Achilles injections. Low dose (LD group) (n = 18) underwent a novel technique with three low-dose (0.1mg) injections of collagenase that were separated by two weeks, the high dose group (HD) (n = 18) underwent traditional single high-dose (0...
2018: PloS One
https://www.readbyqxmd.com/read/29435813/expectations-following-rotator-cuff-surgery
#10
REVIEW
Alejandro Novoa-Boldo, Lawrence V Gulotta
PURPOSE OF REVIEW: To outline the radiographic and clinical outcomes after a rotator cuff surgery in order to set the expectations with the patient before the surgery to obtain a better outcome, taking into account the factors that can affect the outcome and the technique used for the repair. RECENT FINDINGS: The majority of surgeons use arthroscopic repair. The double-row repair has better biomechanical strength, footprint coverage, and radiographic healing rates...
February 13, 2018: Current Reviews in Musculoskeletal Medicine
https://www.readbyqxmd.com/read/29434794/biomechanical-analysis-of-brachial-plexus-injury-availability-of-three-dimensional-finite-element-model-of-the-brachial-plexus
#11
Atsushi Mihara, Tsukasa Kanchiku, Norihiro Nishida, Haruki Tagawa, Junji Ohgi, Hidenori Suzuki, Yasuaki Imajo, Masahiro Funaba, Daisuke Nakashima, Xian Chen, Toshihiko Taguchi
Adult brachial plexus injuries frequently lead to significant and permanent physical disabilities. Investigating the mechanism of the injury using biomechanical approaches may lead to further knowledge with regard to preventing brachial plexus injuries. However, there are no reports of biomechanical studies of brachial plexus injuries till date. Therefore, the present study used a complex three-dimensional finite element model (3D-FEM) of the brachial plexus to analyze the mechanism of brachial plexus injury and to assess the validity of the model...
February 2018: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29432728/galectin-3-is-essential-for-proper-bone-cell-differentiation-and-activity-bone-remodeling-and-biomechanical-competence-in-mice
#12
Carla Iacobini, Claudia Blasetti Fantauzzi, Rossella Bedini, Raffaella Pecci, Armando Bartolazzi, Bruno Amadio, Carlo Pesce, Giuseppe Pugliese, Stefano Menini
OBJECTIVE: Galectin-3 is constitutively expressed in bone cells and was recently shown to modulate osteogenic transdifferentiation of vascular smooth muscle cells and atherosclerotic calcification. However, the role of galectin-3 in bone physiology is largely undefined. To address this issue, we analyzed (1) the skeletal features of 1-, 3- and 6-month-old galectin-3 null (Lgals3-/-) and wild type (WT) mice and (2) the differentiation and function of osteoblasts and osteoclasts derived from these animals...
February 9, 2018: Metabolism: Clinical and Experimental
https://www.readbyqxmd.com/read/29428174/mid-term-function-and-remodeling-potential-of-tissue-engineered-tricuspid-valve-histology-and-biomechanics
#13
Diana M Ropcke, Jonas Rasmussen, Christine Ilkjær, Søren N Skov, Marcell J Tjørnild, Ulrik T Baandrup, Carl Christian Danielsen, Vibeke E Hjortdal, Sten L Nielsen
OBJECTIVE: Tricuspid valve reconstruction using a small intestinal submucosal porcine extracellular matrix (ECM) tube graft is hypothesized to be durable for six months and show signs of recellularization and growth potential. The purpose was to histologically and biomechanically test ECM valves before and after six months of implantation in pigs for comparison with native valves. METHODS: Ten 60 kg pigs were included, which survived tricuspid valve tube graft insertion...
February 2, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29426267/biomechanical-evaluations-of-bed-to-wheelchair-transfer-gait-belt-versus-walking-belt
#14
Ruoliang Tang, Margaret Holland, Michelle Milbauer, Elise Olson, Janelle Skora, Jay M Kapellusch, Arun Garg
Nursing personnel, particularly caregivers who frequently perform manual patient transfer tasks, are at risk for work-related musculoskeletal disorders (WMSDs). The purpose of this study was to perform biomechanical evaluations of bed-to-wheelchair transfer using two low-cost assistive devices: walking belt and gait belt. Twenty-eight college students, serving as caregivers, transferred 14 students, serving as patients. "Caregiver" spinal loading and strength requirements at major joints were measured using a 3D Static Strength Prediction Model...
February 1, 2018: Workplace Health & Safety
https://www.readbyqxmd.com/read/29418119/leg-muscle-architecture-in-primates-and-its-correlation-with-locomotion-patterns
#15
Damiano Marchi, Carissa L Leischner, Francisco Pastor, Adam Hartstone-Rose
Bone biomechanical studies indicate that leg bone structure can be related to different locomotor patterns. The osteological correlates of extant primates' locomotion patterns and substrate use are important to consider when estimating corresponding behaviors of extinct primates. Here, we test if these same patterns are seen in the differences in leg muscular architecture. Muscle mass, fascicle lengths (FL), physiological cross-sectional area (PCSA), reduced PCSA (RPCSA) and tendon-to-muscle belly ratio were studied in 33 primate species (6 strepsirrhines, 14 platyrrhines and 13 catarrhines)...
March 2018: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/29416315/comparison-of-corneal-biomechanics-after-myopic-small-incision-lenticule-extraction-compared-to-lasik-an-ex-vivo-study
#16
Anastasios John Kanellopoulos
Purpose: To investigate ex vivo potentially different corneal biomechanical properties after small-incision lenticule extraction (SMILE) versus LASIK for myopic correction. Methods: Thirty human donor corneas were subjected to either myopic SMILE or femtosecond laser-assisted LASIK. Donor corneas were assigned to six investigative groups: Group A, -3.00 D (diopters) SMILE; Group B, -8.00 D SMILE; Group C, -3.00 D LASIK; and Group D, -8.00 D LASIK. Additionally, two control groups were formed: Group E, SMILE and Group F, LASIK...
2018: Clinical Ophthalmology
https://www.readbyqxmd.com/read/29414480/different-models-for-simulation-of-mechanical-behaviour-of-porous-materials
#17
S Muñoz, S M Castillo, Y Torres
Commercially pure Titanium (cpTi) and its alloys are the most successful metallic biomaterials for bone replacement, due to its excellent biomechanical and biofunctional balance. However, these materials have higher elastic modulus when compared with bone, leading to the stress-shielding phenomenon and promoting bone resorption. Development of porous implants with low elastic modulus, providing a good mechanical and functional balance (suitable mechanical strength and optimum osseointegration), is the focus of emergent research in advanced Ti-based alloy biomaterials...
January 31, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29414477/effect-of-porous-orthopaedic-implant-material-and-structure-on-load-sharing-with-simulated-bone-ingrowth-a-finite-element-analysis-comparing-titanium-and-peek
#18
R Dana Carpenter, Brett S Klosterhoff, F Brennan Torstrick, Kevin T Foley, J Kenneth Burkus, Christopher S D Lee, Ken Gall, Robert E Guldberg, David L Safranski
Osseointegration of load-bearing orthopaedic implants, including interbody fusion devices, is critical to long-term biomechanical functionality. Mechanical loads are a key regulator of bone tissue remodeling and maintenance, and stress-shielding due to metal orthopaedic implants being much stiffer than bone has been implicated in clinical observations of long-term bone loss in tissue adjacent to implants. Porous features that accommodate bone ingrowth have improved implant fixation in the short term, but long-term retrieval studies have sometimes demonstrated limited, superficial ingrowth into the pore layer of metal implants and aseptic loosening remains a problem for a subset of patients...
January 30, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29414470/improved-tribocorrosion-performance-of-bio-functionalized-tio2-nanotubes-under-two-cycle-sliding-actions-in-artificial-saliva
#19
Sofia A Alves, André L Rossi, Ana R Ribeiro, Fatih Toptan, Ana M Pinto, Tolou Shokuhfar, Jean-Pierre Celis, Luís A Rocha
After insertion into bone, dental implants may be subjected to tribocorrosive conditions resulting in the release of metallic ions and solid wear debris, which can induce to peri-implant inflammatory reactions accompanied by bone loss, and ultimately implant loosening. Despite the promising ability of TiO2 nanotubes (NTs) to improve osseointegration and avoid infection-related failures, the understanding of their degradation under the simultaneous action of wear and corrosion (tribocorrosion) is still very limited...
February 1, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29413185/editorial-commentary-anchors-away-reflections-on-anchor-placement-and-number-in-rotator-cuff-repair
#20
EDITORIAL
Alan S Curtis
The ideal construct for a rotator cuff repair continues to be a hot topic for debate and biomechanical investigation. A recent study shows that anchors could be placed as close as 1 mm apart without impact on pullout strength. However, further overlap (the buddy anchor construct) led to earlier failure. This conclusion differs from other studies that have recommended the "buddy anchor" construct as a bail-out option in osteoporotic bone. Biomechanical studies are an important source of information for surgical decision making, but often do not directly predict the in vivo environment...
February 2018: Arthroscopy: the Journal of Arthroscopic & related Surgery
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