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https://www.readbyqxmd.com/read/29679256/biomechanical-features-of-six-design-of-the-delta-external-fixator-for-treating-pilon-fracture-a-finite-element-study
#1
Muhammad Hanif Ramlee, Mohd Ayub Sulong, Evelyn Garcia-Nieto, Daniel Angure Penaranda, Antonio Ros Felip, Mohammed Rafiq Abdul Kadir
Pilon fractures can be caused by high-energy vertical forces which may result in long-term patient immobilization. Many experts in orthopedic surgery recommend the use of a Delta external fixator for type III Pilon fracture treatment. This device can promote immediate healing of fractured bone, minimizing the rate of complications as well as allowing early mobilization. The characteristics of different types of the Delta frame have not been demonstrated yet. By using the finite element method, this study was conducted to determine the biomechanical characteristics of six different configurations (Model 1 until Model 6)...
April 21, 2018: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29660634/comparison-of-osteointegration-property-between-pekk-and-peek-effects-of-surface-structure-and-chemistry
#2
Bo Yuan, Qinwen Cheng, Rui Zhao, Xiangdong Zhu, Xiao Yang, Xi Yang, Kai Zhang, Yueming Song, Xingdong Zhang
Weak osteointegration affects the long-term stability of polyaryletherketone (PAEK) implants. Surface modification provides a potential solution to improve the osteointegration property of PAEKs. Polyetheretherketone (PEEK) and polyetherketoneketone (PEKK) are two representative PAEK materials, but the former has more ketone groups and better potential for surface chemical modification than the latter. In this work, porous PEKK (PEKK-P) and PEEK (PEEK-P) were fabricated by a porogen leaching method. The samples were treated with 80% sulfuric acid (PEKK-SP and PEEK-SP) and then simulated body fluid (SBF) incubation (PEKK-BSP and PEEK-BSP)...
April 11, 2018: Biomaterials
https://www.readbyqxmd.com/read/29655486/comprehensive-simulation-on-morphological-and-mechanical-properties-of-trigger-finger-a-cadaveric-model
#3
Yu-Shiuan Cheng, Hsiao-Feng Chieh, Chien-Ju Lin, Li-Chieh Kuo, Kai-Nan An, Fong-Chin Su
Trigger finger has long been a common disorder in hand orthopedics. To clarify the unknown causative factors regarding the disease, numerous experiments were done on human cadavers, including tendon forces, tendon moment arm, mechanical properties of the pulley, gliding resistance, etc. However, most of these studies were conducted on normal fingers. As the etiology of trigger finger is still controversial on whether it is an outcome of tendon nodule or pulley scarring, in this study, a trigger finger model was built combining both the nodule created by silicone gel injection and pulley constriction by external compression...
March 30, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29643970/in-vitro-degradation-behaviors-of-manganese-calcium-phosphate-coatings-on-an-mg-ca-zn-alloy
#4
Yichang Su, Yingchao Su, Wei Zai, Guangyu Li, Cuie Wen
In order to decrease the degradation rate of magnesium (Mg) alloys for the potential orthopedic applications, manganese-calcium phosphate coatings were prepared on an Mg-Ca-Zn alloy in calcium phosphating solutions with different addition of Mn2+ . Influence of Mn content on degradation behaviors of phosphate coatings in the simulated body fluid was investigated to obtain the optimum coating. With the increasing Mn addition, the corrosion resistance of the manganese-calcium phosphate coatings was gradually improved...
2018: Scanning
https://www.readbyqxmd.com/read/29642512/finite-element-simulations-of-hard-on-soft-hip-joint-prosthesis-accounting-for-dynamic-loads-calculated-from-a-musculoskeletal-model-during-walking
#5
Alessandro Ruggiero, Massimiliano Merola, Saverio Affatato
The hip joint replacement is one of the most successful orthopedic surgical procedures although it involves challenges to overcome. The patient group undergoing total hip arthroplasty now includes younger and more active patients who require a broad range of motion and a longer service lifetime for the replacement joint. It is well known that wear tests have a long duration and they are very expensive, thus studying the effects of geometry, loading, or alignment perturbations may be performed by Finite Element Analysis...
April 9, 2018: Materials
https://www.readbyqxmd.com/read/29628133/radiostereometric-analysis-using-clinical-radiographic-views-development-of-a-universal-calibration-object
#6
Jordan S Broberg, Xunhua Yuan, Matthew G Teeter
Radiostereometric analysis (RSA) is a highly accurate technique used to provide three-dimensional (3D) measurements of orthopaedic implant migration for clinical research applications, yet its implementation in routine clinical examinations has been limited. Previous studies have introduced a modified RSA procedure that separates the calibration examinations from the patient examinations, allowing routine clinical radiographs to be analyzed using RSA. However, in order to calibrate the wide range of clinical views, a new calibration object is required...
March 29, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29626280/automated-muscle-segmentation-from-ct-images-of-the-hip-and-thigh-using-a-hierarchical-multi-atlas-method
#7
Futoshi Yokota, Yoshito Otake, Masaki Takao, Takeshi Ogawa, Toshiyuki Okada, Nobuhiko Sugano, Yoshinobu Sato
PURPOSE: Patient-specific quantitative assessments of muscle mass and biomechanical musculoskeletal simulations require segmentation of the muscles from medical images. The objective of this work is to automate muscle segmentation from CT data of the hip and thigh. METHOD: We propose a hierarchical multi-atlas method in which each hierarchy includes spatial normalization using simpler pre-segmented structures in order to reduce the inter-patient variability of more complex target structures...
April 6, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29618349/3d-printing-based-minimally-invasive-cannulated-screw-treatment-of-unstable-pelvic-fracture
#8
Leyi Cai, Yingying Zhang, Chunhui Chen, Yiting Lou, Xiaoshan Guo, Jianshun Wang
BACKGROUND: Open reduction and internal fixation of pelvic fractures could restore the stability of the pelvic ring, but there were several problems. Minimally invasive closed reduction cannulated screw treatment of pelvic fractures has lots advantages. However, how to insert the cannulated screw safely and effectively to achieve a reliable fixation were still hard for orthopedist. Our aim was to explore the significance of 3D printing technology as a new method for minimally invasive cannulated screw treatment of unstable pelvic fracture...
April 4, 2018: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/29603572/analysis-and-optimization-of-bone-machining-for-robotic-orthopedic-surgeries
#9
Derek J Pell, Masakazu Soshi
BACKGROUND: Robot-assisted joint replacement surgery is becoming increasingly more common worldwide, therefore it is important to characterize and improve the bone-cutting mechanics of surgical tools. METHODS: Linear coefficients relating cutting force and chip thickness were derived for a surgical spindle. The cutting coefficients were integrated into an analytical simulation which calculated cutting forces, torque, and power consumption. An optimization experiment was performed...
March 30, 2018: International Journal of Medical Robotics + Computer Assisted Surgery: MRCAS
https://www.readbyqxmd.com/read/29599953/intelligent-control-wheelchair-using-a-new-visual-joystick
#10
Yassine Rabhi, Makrem Mrabet, Farhat Fnaiech
A new control system of a hand gesture-controlled wheelchair (EWC) is proposed. This smart control device is suitable for a large number of patients who cannot manipulate a standard joystick wheelchair. The movement control system uses a camera fixed on the wheelchair. The patient's hand movements are recognized using a visual recognition algorithm and artificial intelligence software; the derived corresponding signals are thus used to control the EWC in real time. One of the main features of this control technique is that it allows the patient to drive the wheelchair with a variable speed similar to that of a standard joystick...
2018: Journal of Healthcare Engineering
https://www.readbyqxmd.com/read/29593978/quantitative-assessments-of-mechanical-responses-upon-radial-extracorporeal-shock-wave-therapy
#11
Yajun Liu, Xiaodong Chen, Anyi Guo, Sijin Liu, Guoqing Hu
Although radial extracorporeal shock wave therapy (rESWT) has been widely used to treat orthopedic disorders with promising clinical results, rESWT largely relies on clinicians' personal experiences and arbitrary judgments, without knowing relationships between administration doses and effective doses at target sites. In fact, practitioners lack a general and reliable way to assess propagation and distribution of pressure waves inside biological tissues quantitatively. This study develops a methodology to combine experimental measurements and computational simulations to obtain pressure fields from rESWT through calibrating and validating computational models with experimental measurements...
March 2018: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/29590712/analysis-of-airborne-dust-as-a-result-of-plaster-cast-sawing
#12
Anko Antabak, Damir Halužan, Abdulah Chouehne, Marko Mance, Nino Fuchs, Ivica Prlić, Ivan Bešlić, Zvjezdana Bencetić Klaić
Plaster splints are used daily in surgical and orthopedic fields in order to immobilize injured children and adults. The aim of this study was to measure the aerodynamic diameter and concentration of dust particles in the air caused by sawing plaster splints (calcium sulfate dehy-drate). We performed fractional measurements of airborne dust particles. The measured particles, which can potentially be inhaled, may have a specific negative effect on human health. Measurements were conducted in laboratory research facilities that simulated hospital conditions within a casting room and the associated waiting room...
December 2017: Acta Clinica Croatica
https://www.readbyqxmd.com/read/29582693/a-theoretical-analysis-and-finite-element-simulation-of-fixator-bone-system-stiffness-on-healing-progression
#13
Jianfeng Li, Xia Zhao, Xiaojie Hu, Chunjing Tao, Run Ji
INTRODUCTION: The unilateral external fixator has become a quick and easy application for fracture stabilization of the extremities; the main value for evaluation of mechanical stability of the external fixator is stiffness. The stiffness property of the external fixator affects the local biomechanical environment of fractured bone. METHODS: In this study, a theoretical model with changing Young's modulus of the callus is established by using the Castigliano's theory, investigating compression stiffness, torsional stiffness and bending stiffness of the fixator-bone system during the healing process...
March 1, 2018: Journal of Applied Biomaterials & Functional Materials
https://www.readbyqxmd.com/read/29571032/computer-assisted-design-and-finite-element-simulation-of-braces-for-the-treatment-of-adolescent-idiopathic-scoliosis-using-a-coronal-plane-radiograph-and-surface-topography
#14
Rany Pea, Jean Dansereau, Christiane Caouette, Nikita Cobetto, Carl-Éric Aubin
BACKGROUND: Orthopedic braces made by Computer-Aided Design and Manufacturing and numerical simulation were shown to improve spinal deformities correction in adolescent idiopathic scoliosis while using less material. Simulations with BraceSim (Rodin4D, Groupe Lagarrigue, Bordeaux, France) require a sagittal radiograph, not always available. The objective was to develop an innovative modeling method based on a single coronal radiograph and surface topography, and assess the effectiveness of braces designed with this approach...
March 14, 2018: Clinical Biomechanics
https://www.readbyqxmd.com/read/29563069/biological-evaluation-and-finite-element-modeling-of-porous-poly-para-phenylene-for-orthopaedic-implants
#15
Hyunhee Ahn, Ravi R Patel, Anthony J Hoyt, Angela S P Lin, F Brennan Torstrick, Robert E Guldberg, Carl P Frick, R Dana Carpenter, Christopher M Yakacki, Nick J Willett
Poly(para-phenylene) (PPP) is a novel aromatic polymer with higher strength and stiffness than polyetheretherketone (PEEK), the gold standard material for polymeric load-bearing orthopaedic implants. The amorphous structure of PPP makes it relatively straightforward to manufacture different architectures, while maintaining mechanical properties. PPP is promising as a potential orthopaedic material; however, the biocompatibility and osseointegration have not been well investigated. The objective of this study was to evaluate biological and mechanical behavior of PPP, with or without porosity, in comparison to PEEK...
March 18, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29537303/an-ex-vivo-study-of-automated-motion-artefact-correction-and-the-impact-on-cone-beam-ct-image-quality-and-interpretability
#16
Rubens Spin-Neto, Louise H Matzen, Lars W Schropp, Thomas S Sørensen, Ann Wenzel
OBJECTIVES: To assess the impact of head motion artefacts and an automated artefact-correction system on CBCT image quality and interpretability for simulated diagnostic tasks. METHODS: A partially dentate human skull was mounted on a robot simulating four types of head movement (antero-posterior translation, nodding, lateral rotation, and tremor), at three distances (0.75, 1.5, and 3 mm) based on two movement patterns (skull returning/not returning to the initial position)...
March 14, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/29522058/structure-composition-trends-in-multicomponent-borosilicate-based-glasses-deduced-from-molecular-dynamics-simulations-with-improved-b-o-and-p-o-force-fields
#17
Baltzar Stevensson, Yang Yu, Mattias Edén
We present a comprehensive molecular dynamics (MD) simulation study of composition-structure trends in a set of 25 glasses of widely spanning compositions from the following four systems of increasing complexity: Na2 O-B2 O3 , Na2 O-B2 O3 -SiO2 , Na2 O-CaO-SiO2 -P2 O5 , and Na2 O-CaO-B2 O3 -SiO2 -P2 O5 . The simulations involved new B-O and P-O potential parameters developed within the polarizable shell-model framework, thereby combining the beneficial features of an overall high accuracy and excellent transferability among different glass systems and compositions: this was confirmed by the good accordance with experimental data on the relative BO3 /BO4 populations in borate and boro(phospho)silicate networks, as well as with the orthophosphate fractions in bioactive (boro)phosphosilicate glasses, which is believed to strongly influence their bone-bonding properties...
March 9, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29515648/analysis-of-the-impact-of-configuration-of-the-stabilisation-system-for-femoral-diaphyseal-fractures-on-the-state-of-stresses-and-displacements
#18
Jakub J Słowiński, Konrad Kudłacik
Introduction: The treatment of femoral diaphyseal fractures by intramedullary nailing has become a common procedure in orthopaedic surgery. The purpose of this numerical simulation was to present how the changes in configuration of the stabilisation system can affect the stress and displacement state in the bone tissue and implanted device. Material and Methods: The numerical comparison of the stabilisation variants for the type 32-A2 femoral diaphyseal fracture (according to the AO classification) performed by using the Charfix2 (ChM®) anatomical nail locked in a number of chosen ways...
2018: Applied Bionics and Biomechanics
https://www.readbyqxmd.com/read/29503698/a-review-of-current-clinical-applications-of-three-dimensional-printing-in-spine-surgery
#19
REVIEW
Woojin Cho, Alan Varkey Job, Jing Chen, Jung Hwan Baek
Three-dimensional (3D) printing is a transformative technology with a potentially wide range of applications in the field of orthopaedic spine surgery. This article aims to review the current applications, limitations, and future developments of 3D printing technology in orthopaedic spine surgery. Current preoperative applications of 3D printing include construction of complex 3D anatomic models for improved visual understanding, preoperative surgical planning, and surgical simulations for resident education...
February 2018: Asian Spine Journal
https://www.readbyqxmd.com/read/29503591/surgical-simulation-training-in-orthopedics-current-insights
#20
REVIEW
Portia Kalun, Natalie Wagner, James Yan, Markku T Nousiainen, Ranil R Sonnadara
Background: While the knowledge required of residents training in orthopedic surgery continues to increase, various factors, including reductions in work hours, have resulted in decreased clinical learning opportunities. Recent work suggests residents graduate from their training programs without sufficient exposure to key procedures. In response, simulation is increasingly being incorporated into training programs to supplement clinical learning. This paper reviews the literature to explore whether skills learned in simulation-based settings results in improved clinical performance in orthopedic surgery trainees...
2018: Advances in Medical Education and Practice
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