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https://www.readbyqxmd.com/read/28097422/novel-alignment-measurement-technique-for-total-knee-arthroplasty-using-patient-specific-instrumentation
#1
Kazumasa Yamamura, Yukihide Minoda, Shigekazu Mizokawa, Yoichi Ohta, Ryo Sugama, Suguru Nakamura, Hideki Ueyama, Hiroaki Nakamura
INTRODUCTION: This study was designed to evaluate the true accuracy of patient specific instrumentation (PSI) for total knee arthroplasty (TKA) using a new 3D measurement method. MATERIALS AND METHODS: Consecutive 21 patients (30 knees) who underwent TKA using computed tomography (CT)-based PSI were retrospectively evaluated. Mean patient age was 69.2 years (62 to 77). The postoperative three-dimensional (3D) CT image were superimposed onto the preoperative 3D CT plan and measured the absolute difference in the prosthetic alignment using six parameters: coronal, sagittal, and axial alignment of the femoral and tibial prostheses...
January 17, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28096184/the-modern-role-of-transoesophageal-echocardiography-in-the-assessment-of-valvular-pathologies
#2
REVIEW
Malgorzata Wamil, Sacha Bull, James Newton
Despite significant advancements in the field of cardiovascular imaging, transoesophageal echocardiography remains the key imaging modality in the management of valvular pathologies. This paper provides echocardiographers with an overview of the modern role of TOE in the diagnosis and management of valvular disease. We describe how the introduction of 3D techniques has changed detection and grading of valvular pathologies and concentrate on its role as a monitoring tool in interventional cardiology. In addition, we focus on the echocardiographic and Doppler techniques used in the assessment of prosthetic valves, and provide guidance for evaluation of prosthetic valves...
January 17, 2017: Echo Research and Practice
https://www.readbyqxmd.com/read/28090512/surgical-applications-of-three-dimensional-printing-a-review-of-the-current-literature-how-to-get-started
#3
REVIEW
Don Hoang, David Perrault, Milan Stevanovic, Alidad Ghiassi
Three dimensional (3D) printing involves a number of additive manufacturing techniques that are used to build structures from the ground up. This technology has been adapted to a wide range of surgical applications at an impressive rate. It has been used to print patient-specific anatomic models, implants, prosthetics, external fixators, splints, surgical instrumentation, and surgical cutting guides. The profound utility of this technology in surgery explains the exponential growth. It is important to learn how 3D printing has been used in surgery and how to potentially apply this technology...
December 2016: Annals of Translational Medicine
https://www.readbyqxmd.com/read/28066587/comparison-of-outcomes-of-tricuspid-annuloplasty-with-3d-rigid-versus-flexible-prosthetic-ring-for-functional-tricuspid-regurgitation-secondary-to-rheumatic-mitral-valve-disease
#4
Haiping Wang, Xiancheng Liu, Xin Wang, Zhenqian Lv, Xiaojun Liu, Ping Xu
BACKGROUND: Annuloplasty bands and rings are widely used for repairing functional tricuspid regurgitation (FTR). However, the question regarding which is the ideal annuloplasty device remains unclear. The aim of this study was to compare the efficacy and mid-term durability of tricuspid ring annuloplasty for FTR secondary to rheumatic mitral valve disease using flexible Cosgrove-Edwards band and the rigid Edwards MC3 ring (Edwards Lifesciences, LLC, Irvine, CA, USA). METHODS: We retrospectively collected the clinical data of those who underwent mitral valve replacement (MVR) in concomitant with tricuspid ring annuloplasty from 2009 to 2013...
November 2016: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28008211/dynamic-tracking-of-prosthetic-valve-motion-and-deformation-from-bi-plane-x-ray-views-feasibility-study
#5
Charles R Hatt, Martin Wagner, Amish N Raval, Michael A Speidel
Transcatheter aortic valve replacement (TAVR) requires navigation and deployment of a prosthetic valve within the aortic annulus under fluoroscopic guidance. To support improved device visualization in this procedure, this study investigates the feasibility of frame-by-frame 3D reconstruction of a moving and expanding prosthetic valve structure from simultaneous bi-plane x-ray views. In the proposed method, a dynamic 3D model of the valve is used in a 2D/3D registration framework to obtain a reconstruction of the valve...
2016: Proceedings of SPIE
https://www.readbyqxmd.com/read/27996078/physically-realisable-3d-bone-prosthesis-design-with-interpolated-microstructures
#6
Andrew D Cramer, Vivien J Challis, Anthony P Roberts
We present a new approach to designing three-dimensional, physically realisable porous femoral implants with spatially varying microstructures and effective material properties. We optimise over a simplified design domain to reduce shear stress at the bone-prosthetic interface with a constraint on the bone resorption measured using strain energy. This combination of objective and constraint aims to reduce implant failure and allows a detailed study of the implant designs obtained with a range of microstructure sets and parameters...
December 20, 2016: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/27992234/using-dental-gps-to-navigate-implant-placement
#7
Byran T Harris, William C Scarfe, Daniel R Llop, Wei-Shao Lin
Digital advances have changed implant planning to improve outcomes in placement and restoration. Layering multiple image inputs, such as volumetric radiology, photography, and 3-dimensional (3D) surface scans, has allowed better assessment of patients with partial or complete edentulism, and this can aid in producing 3D visual predictions, implant guides, and prosthetics to execute the proposed plan.
September 2016: Compendium of Continuing Education in Dentistry
https://www.readbyqxmd.com/read/27990059/decentralized-feedback-controllers-for-exponential-stabilization-of-hybrid-periodic-orbits-application-to-robotic-walking
#8
Kaveh Akbari Hamed, Robert D Gregg
This paper presents a systematic algorithm to design time-invariant decentralized feedback controllers to exponentially stabilize periodic orbits for a class of hybrid dynamical systems arising from bipedal walking. The algorithm assumes a class of parameterized and nonlinear decentralized feedback controllers which coordinate lower-dimensional hybrid subsystems based on a common phasing variable. The exponential stabilization problem is translated into an iterative sequence of optimization problems involving bilinear and linear matrix inequalities, which can be easily solved with available software packages...
July 2016: Proceedings of the ... American Control Conference
https://www.readbyqxmd.com/read/27933590/three-dimensional-rotational-angiography-for-assessment-of-coronary-arteries-during-melody-valve-implantation-introducing-a%C3%A2-technique-that-may-improve-outcomes
#9
C R Pockett, J W Moore, H G El-Said
BACKGROUND: Adverse events from Melody valve implantation may be catastrophic. To date a role for three dimensional rotational angiography of the aortic root (3DRAA) during Melody valve implantation has not been established. OBJECTIVES: To describe the role of 3DRAA in the assessment of Melody valve candidacy and to demonstrate that it may improve outcomes. METHODS: All patients who underwent cardiac catheterisation for Melody valve implantation and 3DRAA between August 2013 and February 2015 were reviewed...
December 8, 2016: Netherlands Heart Journal
https://www.readbyqxmd.com/read/27928599/understanding-wear-in-dual-mobility-total-hip-replacement-first-generation-explant-wear-patterns
#10
Bertrand Boyer, Thomas Neri, Jean Geringer, Alexandre Di Iorio, Remi Philippot, Frederic Farizon
PURPOSE: Dual mobility was introduced by Pr. G. Bousquet to improve the dislocation risk of total hip arthroplasty (THR). The wear mechanisms of this implant remain to be understood. Could enhanced explant wear analysis explain liner wear behaviour? METHODS: Sixty-six explanted liners were selected. Non-destructive 3D scanning and heat colour treatment allowed reporting wear patterns on both convex and concave sides of the liners. RESULTS: For many liners, liner convexity wear was found to be homogeneous, and linked to a longer implantation time...
December 7, 2016: International Orthopaedics
https://www.readbyqxmd.com/read/27915125/artificial-neural-networks-as-a-powerful-numerical-tool-to-classify-specific-features-of-a-tooth-based-on-3d-scan-data
#11
Stefan Raith, Eric Per Vogel, Naeema Anees, Christine Keul, Jan-Frederik Güth, Daniel Edelhoff, Horst Fischer
Chairside manufacturing based on digital image acquisition is gainingincreasing importance in dentistry. For the standardized application of these methods, it is paramount to have highly automated digital workflows that can process acquired 3D image data of dental surfaces. Artificial Neural Networks (ANNs) arenumerical methods primarily used to mimic the complex networks of neural connections in the natural brain. Our hypothesis is that an ANNcan be developed that is capable of classifying dental cusps with sufficient accuracy...
November 27, 2016: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/27849521/low-cost-methodology-for-skin-strain-measurement-of-a-flexed-biological-limb
#12
Bevin Lin, Kevin M Moerman, Connor G McMahan, Kenneth A Pasch, Hugh M Herr
OBJECTIVE: The purpose of this manuscript is to compute skin strain data from a flexed biological limb, using portable, inexpensive, and easily-available resources. METHODS: We apply and evaluate this approach on a person with bi-lateral transtibial amputations, imaging left and right residual limbs in extended and flexed knee postures. We map 3D deformations to a flexed biological limb using freeware and a simple point-and-shoot camera. Mean principal strain, maximum shear strain, as well as lines of maximum, minimum, and non-extension are computed from 3D digital models to inform directional mappings of the strain field for an unloaded residual limb...
November 10, 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/27843356/virtual-surgical-planning-and-3d-printing-in-prosthetic-orbital-reconstruction-with-percutaneous-implants-a-technical-case-report
#13
Yu-Hui Huang, Rosemary Seelaus, Linping Zhao, Pravin K Patel, Mimis Cohen
Osseointegrated titanium implants to the cranial skeleton for retention of facial prostheses have proven to be a reliable replacement for adhesive systems. However, improper placement of the implants can jeopardize prosthetic outcomes, and long-term success of an implant-retained prosthesis. Three-dimensional (3D) computer imaging, virtual planning, and 3D printing have become accepted components of the preoperative planning and design phase of treatment. Computer-aided design and computer-assisted manufacture that employ cone-beam computed tomography data offer benefits to patient treatment by contributing to greater predictability and improved treatment efficiencies with more reliable outcomes in surgical and prosthetic reconstruction...
2016: International Medical Case Reports Journal
https://www.readbyqxmd.com/read/27798408/methodology-for-designing-and-manufacturing-complex-biologically-inspired-soft-robotic-fluidic-actuators-prosthetic-hand-case-study
#14
E Thompson-Bean, R Das, A McDaid
We present a novel methodology for the design and manufacture of complex biologically inspired soft robotic fluidic actuators. The methodology is applied to the design and manufacture of a prosthetic for the hand. Real human hands are scanned to produce a 3D model of a finger, and pneumatic networks are implemented within it to produce a biomimetic bending motion. The finger is then partitioned into material sections, and a genetic algorithm based optimization, using finite element analysis, is employed to discover the optimal material for each section...
October 31, 2016: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/27796072/time-efficiency-analysis-of-the-treatment-with-monolithic-implant-crowns-in-a-digital-workflow-a-randomized-controlled-trial
#15
Tim Joda, Urs Brägger
OBJECTIVES: The aim of the randomized controlled trial was to analyze time-efficiency of a treatment with implant crowns made of monolithic lithium disilicate (LS2) plus titanium base vs. porcelain fuse to zirconium dioxide (ZrO2 ) in a digital workflow. MATERIALS AND METHODS: Twenty study participants were included for single-tooth replacement in premolar and molar sites. Baseline was the start of the prosthetic treatment. All patients received transocclusal screw-retained implant reconstructions on a soft tissue level-type implant...
November 2016: Clinical Oral Implants Research
https://www.readbyqxmd.com/read/27789209/three-dimensional-printing-for-restoration-of-the-donor-face-a-new-digital-technique-tested-and-used-in-the-first-facial-allotransplantation-patient-in-finland
#16
A A Mäkitie, M Salmi, A Lindford, J Tuomi, P Lassus
BACKGROUND AND AIMS: Prosthetic mask restoration of the donor face is essential in current facial transplant protocols. The aim was to develop a new three-dimensional (3D) printing (additive manufacturing; AM) process for the production of a donor face mask that fulfilled the requirements for facial restoration after facial harvest. MATERIALS AND METHODS: A digital image of a single test person's face was obtained in a standardized setting and subjected to three different image processing techniques...
October 5, 2016: Journal of Plastic, Reconstructive & Aesthetic Surgery: JPRAS
https://www.readbyqxmd.com/read/27699662/imaging-the-implant-soft-tissue-interactions-in-total-knee-arthroplasty
#17
Michel P Bonnin, Tom Van Hoof, Arnoud De Kok, Matthias Verstraete, Catherine Van der Straeten, Moreno Saffarini, Jan Victor
BACKGROUND: In Total Knee Arthroplasty (TKA), residual pain may be secondary to soft tissue impingements, which are difficult to visualize around chromium-cobalt implants using medical imaging, so their interactions remain poorly understood. The goal of this work was to establish a protocol for in-vitro imaging of the soft tissues around TKA, usable during throughout the range of motion (ROM). METHODS: The full size range of a commercially available TKA prosthesis was manufactured by 3D-printing in non-magnetic and non-radiopaque polymer and implanted in 12 cadaveric knees...
December 2016: Journal of Experimental Orthopaedics
https://www.readbyqxmd.com/read/27672779/poster-12-three-dimensional-3d-printed-prosthetics-offer-functional-improvement-in-individuals-with-upper-extremity-limb-loss-a-case-series
#18
Cesar Colasante, Kyle Silva, Yuxi Chen, Matthew N Bartels
No abstract text is available yet for this article.
September 2016: PM & R: the Journal of Injury, Function, and Rehabilitation
https://www.readbyqxmd.com/read/27666493/creation-of-a-3-dimensional-virtual-dental-patient-for-computer-guided-surgery-and-cad-cam-interim-complete-removable-and-fixed-dental-prostheses-a-clinical-report
#19
Bryan T Harris, Daniel Montero, Gerald T Grant, Dean Morton, Daniel R Llop, Wei-Shao Lin
This clinical report proposes a digital workflow using 2-dimensional (2D) digital photographs, a 3D extraoral facial scan, and cone beam computed tomography (CBCT) volumetric data to create a 3D virtual patient with craniofacial hard tissue, remaining dentition (including surrounding intraoral soft tissue), and the realistic appearance of facial soft tissue at an exaggerated smile under static conditions. The 3D virtual patient was used to assist the virtual diagnostic tooth arrangement process, providing patient with a pleasing preoperative virtual smile design that harmonized with facial features...
September 22, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27665141/ultrasonic-bone-localization-algorithm-based-on-time-series-cumulative-kurtosis
#20
Guillermo Robles, José Manuel Fresno, Romano Giannetti
The design and optimization of protective equipment and devices such as exoskeletons and prosthetics have the potential to be enhanced by the ability of accurately measure the positions of the bones during movement. Existing technologies allow a quite precise measurement of motion-mainly by using coordinate video-cameras and skin-mounted markers-but fail in directly measuring the bone position. Alternative approaches, as fluoroscopy, are too invasive and not usable during extended lapses of time, either for cost or radiation exposure...
September 22, 2016: ISA Transactions
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