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clinical biomechanics

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https://www.readbyqxmd.com/read/29777394/biomechanical-impact-of-wrong-positioning-of-a-dedicated-stent-for-coronary-bifurcations-a-virtual-bench-testing-study
#1
Claudio Chiastra, Maik J Grundeken, Carlos Collet, Wei Wu, Joanna J Wykrzykowska, Giancarlo Pennati, Gabriele Dubini, Francesco Migliavacca
The treatment of coronary bifurcations is challenging for interventional cardiologists. The Tryton stent (Tryton Medical, Inc., USA) is one of the few devices specifically designed for coronary bifurcations that underwent large clinical trials. Although the manufacturer provides specific recommendations to position the stent in the bifurcation side branch (SB) according to four radio-opaque markers under angiographic guidance, wrong device positioning may accidentally occur. In this study, the virtual bench testing approach was used to investigate the impact of wrong positioning of the Tryton stent in coronary bifurcations in terms of geometrical and biomechanical criteria...
May 17, 2018: Cardiovascular Engineering and Technology
https://www.readbyqxmd.com/read/29773456/custom-air-puff-derived-biomechanical-variables-in-a-refractive-surgery-screening-setting-study-from-2-centers
#2
Vinicius S De Stefano, Ibrahim Seven, J Bradley Randleman, William J Dupps
PURPOSE: To assess the ability of air puff-derived biomechanical variables to predict surgeon-perceived candidacy for laser in situ keratomileusis (LASIK). SETTING: Cole Eye Institute, Cleveland Clinic, Cleveland, Ohio, and Emory Eye Institute, Emory University, Atlanta, Georgia, USA. DESIGN: Retrospective case series. METHODS: Data were collected from refractive surgery screening examinations by 2 surgeons at 2 centers...
May 15, 2018: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29771749/brillouin-microscopy-assessing-ocular-tissue-biomechanics
#3
Seok Hyun Yun, Dimitri Chernyak
PURPOSE OF REVIEW: Assessment of corneal biomechanics has been an unmet clinical need in ophthalmology for many years. Many researchers and clinicians have identified corneal biomechanics as source of variability in refractive procedures and one of the main factors in keratoconus. However, it has been difficult to accurately characterize corneal biomechanics in patients. The recent development of Brillouin light scattering microscopy heightens the promise of bringing biomechanics into the clinic...
May 15, 2018: Current Opinion in Ophthalmology
https://www.readbyqxmd.com/read/29770583/angle-stable-interlocking-intramedullary-nails-for-tibial-plateau-fractures
#4
Peng Jia, Feng-Cheng Lu, Kifayat Ullah, Man Zhang, Yan-Sheng Dong, Chao Xiong, Zhi-Hui Zhao, Jin-Feng Wang, Ju-Wen Chen, Yong-Qing Wang
OBJECTIVE: Angle stable interlocking intramedullary nail (ASIN), a novel technique, has rarely been used for treatment of tibial plateau fractures (TPF). This retrospective study was designed to introduce this novel technique, ASIN, as well as to describe the initial experience and verify the effectiveness when ASIN was used for the management for TPF. METHODS: A cohort of 19 cases with closed TPF aged from 18-70 years with at least 23 months follow-up from November 2008 to September 2013 was analyzed retrospectively...
May 16, 2018: Orthopaedic Surgery
https://www.readbyqxmd.com/read/29770179/biomechanical-comparison-between-titanium-and-cobalt-chromium-rods-used-in-a-pedicle-subtraction-osteotomy-model
#5
Kalpit N Shah, Gregory Walker, Sarath C Koruprolu, Alan H Daniels
Instrumentation failure is a common complication following complex spinal reconstruction and deformity correction. Rod fracture is the most frequent mode of hardware failure and often occurs at or near a 3-column osteotomy site. Titanium (Ti) rods are commonly utilized for spinal fixations, however, theoretically stiffer materials, such as cobalt-chrome (CoCr) rods are also available. Despite ongoing use in clinical practice, there is little biomechanical evidence that compares the construct ability to withstand fatigue stress for Ti and Co-Cr rods...
March 29, 2018: Orthopedic Reviews
https://www.readbyqxmd.com/read/29765875/clinical-and-biomechanical-effects-of-low-dye-taping-and-figure-8-modification-of-low-dye-taping-in-patients-with-heel-pad-atrophy
#6
You Hyeon Chae, Joo Sup Kim, Yeon Kang, Hyun Young Kim, Tae Im Yi
Objective: To investigate and compare the effect of low-dye taping (LDT) and figure-8 modification of LDT (MLDT) on peak plantar pressure and heel pain in patients with heel pad atrophy. Methods: There were reviewed 32 feet of 19 patients who have been diagnosed with heel pad atrophy who were enrolled in this study. The patients were diagnosed with heel pad atrophy with clinical findings, and loaded heel pad thickness measured by ultrasonography. At the first visit, patients were taught how to do LDT and MLDT...
April 2018: Annals of Rehabilitation Medicine
https://www.readbyqxmd.com/read/29763336/adjustable-loop-femoral-cortical-suspensory-fixation-for-patellar-tendon-anterior-cruciate-ligament-reconstruction-a-time-zero-biomechanical-comparison-with-interference-screw-fixation
#7
Dayne T Mickelson, Thomas Lefebvre, Ken Gall, Jonathan C Riboh
BACKGROUND: Adjustable-loop cortical buttons for femoral fixation of bone-tendon-bone grafts have potential advantages over interference screw fixation; however, these devices have not been benchmarked biomechanically against interference screws. Purpose/Hypothesis: The purpose was to compare the time zero biomechanical properties of commercially available, adjustable-loop cortical button and metallic interference screws for femoral fixation of bone-tendon-bone grafts. It was hypothesized that no significant differences would be found in biomechanical properties between fixation techniques...
May 1, 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29762846/neurotrophin-3-improves-fracture-healing-in-rats
#8
X Li, D-C Sun, Y Li, X-Y Wu
OBJECTIVE: This study aimed at investigating the role of Neurotrophin-3 (NT-3) in the bone fracture healing of rats and to provide a reference for clinical treatment. MATERIALS AND METHODS: 40 Sprague-Dawley (SD) rats were randomly divided into control group and NT-3 group. The tibia fracture model was made in NT-3 group, and the tibia bone mineral density (BMD) was measured before and after the surgery. The biomechanics indexes were inspected after the surgery, including elasticity modulus, max load, and bending rigidity...
April 2018: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29761748/transfemoral-amputation-adductor-myodesis-using-fibertape-and-knotless-anchors
#9
Andrew R Hsu
Transfemoral amputation is considered the last treatment option for severe infection, vascular disease, trauma, and malignant tumors of the lower extremity that have failed limb salvage. Unopposed pull of the hip abductors causes a flexion-abduction thigh deformity that results in abnormal biomechanics and increased oxygen consumption during ambulation. Myodesis of the adductor tendons is a critical component of transfemoral amputation that creates dynamic muscle balance, enhances prosthetic fitting and function, and improves clinical outcomes...
May 1, 2018: Foot & Ankle International
https://www.readbyqxmd.com/read/29761555/computational-optimization-of-graft-tension-in-simulated-superior-capsule-reconstructions
#10
Michael W Hast, Elaine Schmidt, John D Kelly, Josh R Baxter
Superior capsular reconstruction has received increased attention as a surgical technique to address massive 'irreparable' rotator cuff tears; however, the functional limitations and surgical techniques associated with this repair have yet to be sufficiently explored. The goal of this study was to utilize a multidisciplinary approach to characterize the biomechanics of this repair by: 1) identifying activities of daily living that may overburden graft, and 2) optimizing surgical techniques used during implantation...
May 14, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29761298/lumbar-muscle-atrophy-caused-by-harness-replacement-in-a-chronic-calf-model-of-total-artificial-heart-implantation
#11
Jamshid H Karimov, Kimberly A Such, Raymond Dessoffy, Kiyotaka Fukamachi
The postoperative care of animals implanted with mechanical circulatory support devices is complex. The standard of care requires continuous monitoring of hemodynamic parameters post implant, wound care, and maintenance of the animal's well-being, but also includes controlling the animal's biomechanics under conditions of continuous restraint and harnessing. In such studies, a harness provides secure fixation of the exteriorized device driveline and pressure lines and aids animal handling (lifting, position adjustment, and assistance with standing up)...
May 14, 2018: Journal of Artificial Organs: the Official Journal of the Japanese Society for Artificial Organs
https://www.readbyqxmd.com/read/29761212/the-elastic-capacity-of-a-tendon-repair-construct-influences-the-force-necessary-to-induce-gapping
#12
Atesch Ateschrang, Christoph Salewski, Marc-Daniel Ahrend, Anna Janine Schreiner, Michael T Hirschmann, Ulrich Stöckle, Sufian S Ahmad
PURPOSE: Most biomechanical investigations of tendon repairs were based on output measures from hydraulic loading machines, therefore, accounting for construct failure rather than true gapping within the rupture zone. It was hypothesized that the elastic capacity of a tendon-repair construct influences the force necessary to induce gapping. METHODS: A tendon-repair model was created in 48 porcine lower hind limbs, which were allocated to three fixation techniques: (1) Krackow, (2) transosseous and (3) anchor fixation...
May 14, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29761106/current-strategies-and-future-directions-to-optimize-acl-reconstruction-in-adolescent-patients
#13
Dustin Jon Richter, Roger Lyon, Scott Van Valin, Xue-Cheng Liu
The incidence of anterior cruciate ligament (ACL) injuries in the pediatric population has risen in recent years. These injuries have historically presented a management dilemma in skeletally immature patients with open physes and significant growth remaining at time of injury. While those nearing skeletal maturity may be treated with traditional, transphyseal adult techniques, these same procedures risk iatrogenic damage to the growth plates and resultant growth disturbances in younger patients with open physes...
2018: Frontiers in Surgery
https://www.readbyqxmd.com/read/29760787/inverted-rearfoot-posture-in-subjects-with-coexisting-patellofemoral-osteoarthritis-in-medial-knee-osteoarthritis-an-exploratory-study
#14
Hirotaka Iijima, Hiroshi Ohi, Naoto Fukutani, Tomoki Aoyama, Eishi Kaneda, Kaoru Abe, Masaki Takahashi, Shuichi Matsuda
Background: While abnormal rearfoot posture and its relationship to patellofemoral (PF) pain has been thoroughly discussed in the literature, its relationship to patellofemoral osteoarthritis (PFOA) has not been determined. This study aimed to examine whether rearfoot posture is associated with a higher prevalence of radiographic PFOA in a compartment-specific manner in patients with medial tibiofemoral osteoarthritis (TFOA). Methods: Participants from orthopedic clinics ( n  = 68, age 56-90 years, 75...
2018: Journal of Foot and Ankle Research
https://www.readbyqxmd.com/read/29758960/biomechanical-investigation-of-orthodontic-treatment-planning-based-on-orthodontic-force-measurement-and-finite-element-method-before-implementation-a-case-study
#15
Jianlei Wu, Yunfeng Liu, Jianxing Zhang, Wei Peng
BACKGROUND: Orthodontic treatment planning (OTP) is primarily depended on clinical experiences of orthodontists at present, while equivocal OTP would increase the possibility of treatment failure. OBJECTIVE: The objective was to investigate a methodology for quantitatively evaluating OTP, using theoretical analyses, orthodontic forces measurement (OFM) and finite element method (FEM). METHODS: An OTP was theoretically designed based on a clinical case and forces on incisors in OTP were measured on a specialized platform...
April 27, 2018: Technology and Health Care: Official Journal of the European Society for Engineering and Medicine
https://www.readbyqxmd.com/read/29756656/pathophysiology-and-treatment-of-achalasia-in-a-muscle-mechanical-perspective
#16
REVIEW
Hans Gregersen, Kar Man Lo
This review provides a biomechanical perspective on the pathophysiology and treatment of achalasia. The esophagus is efficient in transporting ingested material to the stomach in healthy subjects. A fine balance exists between the peristaltic forces generated in the esophageal body (which herein is defined as the preload) and the resistance in the outlet, the esophago-gastric junction (which is defined as the afterload). Achalasia is a rare esophageal disease that progressively over many years challenges esophageal efficacy...
May 14, 2018: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/29753897/comparison-of-multilevel-cervical-disc-replacement-and-multilevel-anterior-discectomy-and-fusion-a-systematic-review-of-biomechanical-and-clinical-evidence
#17
REVIEW
Yang Li, Hangkai Shen, Kamran Z Khan, Shushu Fang, Zhenhua Liao, Weiqiang Liu
The present study aimed to comprehensively compare the clinical and biomechanical efficiency of combined anterior cervical discectomy and fusion (ACDF) with the anterior cervical disc replacement (ACDR) for treatment of multilevel cervical disc diease (CDD) using a meta-analysis and systematical review. A literature search was performed using Pubmed, MEDLINE, EMBASE and the Cochrane Library for papers published between January 1960 and December 2017. Both clinical and biomechanical parameters were analyzed...
May 10, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29752863/3d-mri-modeling-of-thin-and-spatially-complex-soft-tissue-structures-without-shrinkage-lamprey-myosepta-as-an-example
#18
Bradley M Wood, Guang Jia, Owen Carmichael, Kevin McKlveen, Dominique G Homberger
3D imaging techniques enable the non-destructive analysis and modeling of complex structures. Among these, MRI exhibits good soft tissue contrast, but is currently less commonly used for non-clinical research than x-ray CT, even though the latter requires contrast-staining that shrinks and distorts soft tissues. When the objective is the creation of a realistic and complete 3D model of soft tissue structures, MRI data are more demanding to acquire and visualize and require extensive post-processing because they comprise non-cubic voxels with dimensions that represent a trade-off between tissue contrast and image resolution...
May 12, 2018: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/29752819/post-polio-syndrome-and-the-late-effects-of-poliomyelitis-part-1-pathogenesis-biomechanical-considerations-diagnosis-and-investigations
#19
REVIEW
Julian K Lo, Lawrence R Robinson
Post-Polio Syndrome (PPS) is characterized by new muscle weakness and/or muscle fatigability that occurs many years following the initial poliomyelitis illness. There are many theories that exist on the pathogenesis of PPS, which remains incompletely understood. In contrast, the Late Effects of Poliomyelitis are often a consequence of biomechanical alterations that occur as a result of polio-related surgeries, musculoskeletal deformities or weakness. Osteoporosis and fractures of the polio-involved limbs are common...
May 12, 2018: Muscle & Nerve
https://www.readbyqxmd.com/read/29752220/biomechanical-characteristics-of-biplane-multiplanar-tension-side-fixation-for-lapidus-fusion
#20
Paul Dayton, Daniel J Hatch, Robert D Santrock, Bret Smith
Although plating on the plantar, tension-side of the metatarsocuneiform joint provides an inherent biomechanical advantage for Lapidus arthrodesis, it has not been widely adopted owing to the morbidity associated with plantar application. To overcome these limitations, a modification to 90-90 locked biplanar plating was developed to provide the biomechanical advantages of multiplanar fixation and tension-side fixation, allowing application through a conventional incision. We tested the hypothesis that biplanar plating with tension-side fixation (low-profile straight dorsal plate and anatomic medial-plantar plate) would demonstrate improved mechanical stability compared with a previously tested 90-90 biplanar construct (small straight plate dorsally and medially) under cyclic loading...
May 8, 2018: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
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