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https://www.readbyqxmd.com/read/28437193/evaluation-of-the-effects-of-photobiomodulation-on-biomechanical-properties-and-hounsfield-unit-of-partial-osteotomy-healing-in-an-experimental-rat-model-of-type-i-diabetes-and-osteoporosis
#1
Ataroalsadat Mostafavinia, Reza Ahadi, Mohammadamin Abdollahifar, Seyed Kamran Ghorishi, Ali Jalalifirouzkouhi, Mohammad Bayat
BACKGROUND: Pulsed wave (PW) lasers exhibit biostimulatory effects on fractures in healthy and diabetic animals. OBJECTIVE: This study aims to assess the effects of photobiomodulation on bone strength and Hounsfield unit (HU) for repair of a bone defect in an experimental rat model of type I diabetes mellitus (TIDM) and osteoporosis (OP). METHODS: We divided 30 female rats into six groups of n = 5 per group: (1) ovariectomy (OVX) control, (2) OVX + PW laser and no TIDM, (3) OVX control + TIDM, (4) OVX + TIDM + PW laser, (5) OVX + TIDM + alendronate, and (6) OVX + TIDM + PW laser + alendronate...
February 22, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28435927/traumatic-dislocation-of-the-s1-polyaxial-pedicle-screw-head-a-case-report
#2
Pieter N B Du Plessis, Bernard P H Lau, Hwee Weng Dennis Hey
Polyaxial screw head dislocation in the absence of a manufacture defect is extremely rare and represents a biomechanical overload of the screw, leading to early failure. A 58-year-old gentleman underwent instrumented fusion using polyaxial pedicle screws-titanium rod construct with interbody cage for spondylolytic spondylolisthesis at the L5/S1 level. He attempted to bend forward ten days after the surgery which resulted in a dislocation of the right S1 polyaxial screw head from the screw shank with recurrence of symptoms...
March 2017: Journal of Spine Surgery (Hong Kong)
https://www.readbyqxmd.com/read/28427385/differences-between-native-and-prosthetic-knees-in-terms-of-cross-sectional-morphology-of-the-femoral-trochlea-a-study-based-on-three-dimensional-models-and-virtual-total-knee-arthroplasty
#3
Zhe Du, Shichang Chen, Mengning Yan, Bing Yue, You Wang
BACKGROUND: The cross-sectional morphology of the prosthetic knee is crucial to understanding patellar motion and quadriceps strength after total knee arthroplasty. However, few comparative evaluations of the cross-sectional morphology of the femoral trochlea have been performed in the native knee and currently available femoral implants, and the relationship between the trochlear anatomy of prosthetic components and post-operative patellofemoral complications remains unclear. We aimed to investigate the differences in cross-sectional morphology of the femoral trochlea between native knees and prosthetic femoral components...
April 20, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28427315/computational-modeling-of-long-term-effects-of-prophylactic-vertebroplasty-on-bone-adaptation
#4
Sandro D Badilatti, Patrik Christen, Stephen J Ferguson, Ralph Müller
Cement augmentation in vertebrae (vertebroplasty) is usually used to restore mechanical strength after spinal fracture but could also be used as a prophylactic treatment. So far, the mechanical competence has been determined immediately post-treatment, without considering long-term effects of bone adaptation. In this work, we investigated such long-term effects of vertebroplasty on the stiffness of the augmented bone by means of computational simulation of bone adaptation. Using micro-finite element analysis, we determined sites of increased mechanical stress (stress raisers) and stress shielding and, based on the simulations, regions with increased or decreased bone loss due to augmentation...
May 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28426512/technology-in-s-c-assessing-bodyweight-squat-technique-with-wearable-sensors
#5
Martin A O'Reilly, Darragh F Whelan, Tomas E Ward, Eamonn Delahunt, Brian M Caulfield
Strength and conditioning (S&C) coaches offer expert guidance to help those they work with achieve their personal fitness goals. However it is not always practical to operate under the direct supervision of an S&C coach and consequently individuals are often left training without expert oversight. Recent developments in inertial measurement units (IMUs) and mobile computing platforms have allowed for the possibility of unobtrusive motion tracking systems and the provision of real-time individualised feedback regarding exercise performance...
April 15, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28423932/comparing-biomechanical-properties-repair-times-and-value-of-common-core-flexor-tendon-repairs
#6
Aakash Chauhan, Patrick Schimoler, Mark C Miller, Alexander Kharlamov, Gregory A Merrell, Bradley A Palmer
BACKGROUND: The aim of the study was to compare biomechanical strength, repair times, and repair values for zone II core flexor tendon repairs. METHODS: A total of 75 fresh-frozen human cadaveric flexor tendons were harvested from the index through small finger and randomized into one of 5 repair groups: 4-stranded cross-stitch cruciate (4-0 polyester and 4-0 braided suture), 4-stranded double Pennington (2-0 knotless barbed suture), 4-stranded Pennington (4-0 double-stranded braided suture), and 6-stranded modified Lim-Tsai (4-0 looped braided suture)...
April 1, 2017: Hand: Official Journal of the American Association for Hand Surgery
https://www.readbyqxmd.com/read/28422889/an-in-vitro-biomechanical-evaluation-of-an-expansive-double-threaded-bi-directional-compression-screw-for-fixation-of-type-ii-odontoid-process-fractures-a-squire-compliant-article
#7
Ning Liu, Li Tian, Rong-Xian Jiang, Chao Xu, Lei Shi, Wei Lei, Yang Zhang
Odontoid process fracture accounts for 5% to 15% of all cervical spine injuries, and the rate is higher among elderly people. The anterior cannulated screw fixation has been widely used in odontoid process fracture, but the fixation strength may still be limited under some circumstances. This study aims to investigate the biomechanical fixation strength of expansive double-threaded bi-directional compression screw (EDBCS) compared with cannulated lag screw (CLS) and improved Herbert screw (IHS) for fixation of type II odontoid process fracture...
April 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28422586/the-reactive-strength-index-reflects-vertical-stiffness-during-drop-jumps
#8
Kristof Kipp, Michael T Kiely, Matthew D Giordanelli, Philip J Malloy, Christopher F Geiser
The reactive strength index (RSI) is often used to quantify drop jump (DJ) performance; however, not much is known about the biomechanical determinants of the RSI. The purpose of this study was to investigate the correlations between the RSI and several biomechanical variables calculated from DJ performed with different initial drop heights. Twelve, male NCAA DI basketball players performed DJ from drop heights of 30, 45, and 60 cm. Force plates were used to calculate DJ performance parameters (i.e., DJ height, contact time, and RSI) and DJ biomechanical variables (i...
April 19, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28415065/acute-effect-of-biomechanical-muscle-stimulation-on-the-counter-movement-vertical-jump-power-and-velocity-in-division-i-football-players
#9
Bert H Jacobson, Taylor P Monaghan, John H Sellers, Eric C Conchola, Zach K Pope, Rob G Glass
Jacobson, BH, Monaghan, TP, Sellers, JH, Conchola, EC, Pope, ZK, and Glass, RG. Acute effect of biomechanical muscle stimulation on the counter-movement vertical jump power and velocity in division I football players. J Strength Cond Res 31(5): 1259-1264, 2017-Research regarding whole body vibration (WBV) largely supports such training augmentation in attempts to increase muscle strength and power. However, localized biomechanical vibration has not received the same attention. The purpose of this study was to assess peak and average power before and after acute vibration of selected lower-body sites in division I athletes...
May 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28412645/a-hidden-structural-vulnerability-in-the-thrombospondin-2-deficient-aorta-increases-the-propensity-to-intramural-delamination
#10
C Bellini, N J Kristofik, M R Bersi, T R Kyriakides, J D Humphrey
Mice lacking thrombospondin-2 (TSP2) represent an animal model of impaired collagen fibrillogenesis. Collagen constitutes ~1/3 of the wall of the normal murine descending thoracic aorta (DTA) and is thought to confer mechanical strength at high pressures. Microstructural analysis of the DTA from TSP2-null mice revealed irregular and disorganized collagen fibrils in the adventitia and at the interface between the media and adventitia. Yet, biaxial mechanical tests performed under physiologic loading conditions showed that most mechanical metrics, including stress and stiffness, were not different between mutant and control DTAs at 20- and 40-weeks of age, thus suggesting that the absence of TSP2 is well compensated under normal conditions...
March 9, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28402759/medial-posterior-capsular-plication-reduces-anterior-shoulder-instability-similar-to-remplissage-without-restricting-motion-in-the-setting-of-an-engaging-hill-sachs-defect
#11
Brian C Werner, Xiang Chen, Christopher L Camp, Andreas Kontaxis, Joshua S Dines, Lawrence V Gulotta
BACKGROUND: Numerous surgical options for the management of engaging Hill-Sachs lesions exist, of which remplissage has emerged as one of the most popular arthroscopic techniques. Remplissage is not without disadvantages, however, and has been demonstrated to potentially result in a loss of external rotation (ER) due to nonanatomic tethering of the infraspinatus tendon and a potential decrease in infraspinatus strength clinically. PURPOSE: The efficacy of posterior medial capsular plication in addition to Bankart repair was examined as an arthroscopic management strategy for an engaging Hill-Sachs defect...
April 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28401818/-analysing-gait-in-the-gp-s-consulting-room
#12
T van Meulenbroek, I P J Huijnen, G H H Meys, G M Rommers
Gait disorders are often seen in the general practitioner (GP)'s consulting room. Orthopaedic or neurological problems may lead to abnormalities in gait. A careful analysis is important to advice or refer the patient for additional diagnostics or treatment. Basic gait analysis can be performed on any patient by applying a systematic stepwise observation. This is illustrated here by three case reports. This observation starts by looking at parameters such as walking speed, safety, efficiency etc. Analysis of biomechanical pattern such as step frequency, stride length and a detailed analysis of the different joint movements during the stance and swing phase can subsequently be performed...
2017: Nederlands Tijdschrift Voor Geneeskunde
https://www.readbyqxmd.com/read/28400835/the-effects-of-pentoxifylline-adminstration-on-fracture-healing-in-a-postmenopausal-osteoporotic-rat-model
#13
Mohammad Mahdi Vashghani Farahani, Reza Ahadi, Mohammadamin Abdollahifar, Mohammad Bayat
Previous studies report positive effects of pentoxifylline (PTX) alone or in combination with other drugs on some pathologic bone diseases as well as an ability to accelerate osteogensis and fracture healing in both animal models and human patients. The aim of this present study was to evaluate the effects of PTX administration on Hounsfield unit and bone strength at catabolic response (bone resorbing) of a fracture in an experimental rat model of ovariectomy induced osteoporosis (OVX-D). Thirty adult female rats were divided into groups as follows: 1 (OVX, control, no treatment); 2 (OVX, sham: daily distilled water); 3 (OVX, daily alendronate: 3 mg/kg); 4 (OVX, twice daily 100 mg/kg PTX) and 5 (OVX, PTX+alenderonate)...
March 2017: Laboratory Animal Research
https://www.readbyqxmd.com/read/28396901/-%C3%A2-biomechanics-of-new-implants-for-hto
#14
D Pape, A Diffo Kaze, A Hoffmann, S Maas
Biomechanical characteristics of 5 tibial osteotomy plates for the treatment of medial knee joint osteoarthritis were examined. Fourth-generation tibial bone composites underwent a medial open-wedge high tibial osteotomy, using TomoFix™ standard, PEEKPower®, ContourLock®, TomoFix™ small stature plates, and iBalance® implants. Static compression load to failure and load-controlled cyclic fatigue failure tests were performed. All plates had sufficient stability up to 2400 N in the static compression load to failure tests...
April 10, 2017: Der Orthopäde
https://www.readbyqxmd.com/read/28396443/plasma-fibronectin-stabilizes-borrelia-burgdorferi-endothelial-interactions-under-vascular-shear-stress-by-a-catch-bond-mechanism
#15
Alexandra F Niddam, Rhodaba Ebady, Anil Bansal, Anne Koehler, Boris Hinz, Tara J Moriarty
Bacterial dissemination via the cardiovascular system is the most common cause of infection mortality. A key step in dissemination is bacterial interaction with endothelia lining blood vessels, which is physically challenging because of the shear stress generated by blood flow. Association of host cells such as leukocytes and platelets with endothelia under vascular shear stress requires mechanically specialized interaction mechanisms, including force-strengthened catch bonds. However, the biomechanical mechanisms supporting vascular interactions of most bacterial pathogens are undefined...
April 10, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28394844/implant-material-type-of-fixation-at-the-shaft-and-position-of-plate-modify-biomechanics-of-distal-femur-plate-osteosynthesis
#16
Utku Kandemir, Peter Augat, Stefanie Konowalczyk Dipl-Ing, Felix Wipf Dipl-Ing, Geert von Oldenburg Dipl-Ing, Ulf Schmidt
OBJECTIVES: The purpose of this study is to investigate whether 1. the type of fixation at the shaft (hybrid vs. locking), 2. the position of the plate (offset vs. contact) and 3. the implant material has a significant effect on a) construct stiffness and b) fatigue life in a distal femur extraarticular comminuted fracture model using the same design of distal femur periarticular locking plate. METHODS: An extraarticular severely comminuted distal femoral fracture pattern (AO/OTA 33-A3) was simulated using artificial bone substitutes...
April 7, 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28391431/sclerostin-antibody-increases-callus-size-and-strength-but-does-not-improve-fracture-union-in-a-challenged-open-rat-fracture-model
#17
Alyson Morse, Michelle M McDonald, Aaron Schindeler, Lauren Peacock, Kathy Mikulec, Tegan L Cheng, Min Liu, Hua Zhu Ke, David G Little
Open fractures remain a challenge in orthopedics. Current strategies to intervene are often inadequate, particularly in severe fractures or when treatment is delayed. Sclerostin is a negative regulator of bone growth and sclerostin-neutralizing antibodies (Scl-Ab) can increase bone mass and strength. The application of these antibodies to improve orthopedic repair has shown varied results, and may be dependent on the location and severity of the bony injury. We examined Scl-Ab treatment within an established rat osteotomy model with periosteal stripping analogous to open fracture repair...
April 8, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/28391429/femoral-neck-fracture-osteosynthesis-by-the-biplane-double-supported-screw-fixation-method-bdsf-reduces-the-risk-of-fixation-failure-clinical-outcomes-in-207-patients
#18
Orlin Filipov, Karl Stoffel, Boyko Gueorguiev, Christoph Sommer
INTRODUCTION: Osteosynthesis of femoral neck fractures is related up to 46% rate of complications. The novel method of biplane double-supported screw fixation (BDSF; Filipov's method) offers better stability using three medially diverging cannulated screws with two of them buttressed on the calcar. Biomechanically, the most effective component is the distal screw placed at steeper angle and supported on a large area along the distal and posterior cortex of the femoral neck following its spiral anterior curve...
April 8, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28391382/insufficient-stability-of-pedicle-screws-in-osteoporotic-vertebrae-biomechanical-correlation-of-bone-mineral-density-and-pedicle-screw-fixation-strength
#19
Lukas Weiser, Gerd Huber, Kay Sellenschloh, Lennart Viezens, Klaus Püschel, Michael M Morlock, Wolfgang Lehmann
PURPOSE: Loosening of pedicle screws is one major complication of posterior spinal stabilisation, especially in the patients with osteoporosis. Augmentation of pedicle screws with cement or lengthening of the instrumentation is widely used to improve implant stability in these patients. However, it is still unclear from which value of bone mineral density (BMD) the stability of pedicle screws is insufficient and an additional stabilisation should be performed. The aim of this study was to investigate the correlation of bone mineral density and pedicle screw fatigue strength as well as to define a threshold value for BMD below which an additional stabilisation is recommended...
April 8, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28391381/osseointegration-improves-bone-implant-interface-of-pedicle-screws-in-the-growing-spine-a-biomechanical-and-histological-study-using-an-in-vivo-immature-porcine-model
#20
Kanako Shiba, Hiroshi Taneichi, Takashi Namikawa, Satoshi Inami, Daisaku Takeuchi, Yutaka Nohara
PURPOSE: Implant failure is a frequent complication in corrective surgery for early onset scoliosis, since considerable forces are acting on small and fragile vertebrae. Osseointegration showing biomechanical and histological improvement in bone-implant interface (BII) after dental implant placement has been well investigated. However, there are no studies regarding osseointegration in immature vertebral bone. The purpose was to evaluate the timecourse of biomechanical and histological changes at BII after pedicle screw placement using in vivo immature porcine model...
April 8, 2017: European Spine Journal
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