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https://www.readbyqxmd.com/read/28168060/3d-printing-aids-acetabular-reconstruction-in-complex-revision-hip-arthroplasty
#1
Andrew J Hughes, Cathal DeBuitleir, Philip Soden, Brian O'Donnchadha, Anthony Tansey, Ali Abdulkarim, Colm McMahon, Conor J Hurson
Revision hip arthroplasty requires comprehensive appreciation of abnormal bony anatomy. Advances in radiology and manufacturing technology have made three-dimensional (3D) representation of osseous anatomy obtainable, which provide visual and tactile feedback. Such life-size 3D models were manufactured from computed tomography scans of three hip joints in two patients. The first patient had undergone multiple previous hip arthroplasties for bilateral hip infections, resulting in right-sided pelvic discontinuity and a severe left-sided posterosuperior acetabular deficiency...
2017: Advances in Orthopedics
https://www.readbyqxmd.com/read/28108576/dual-source-computed-tomography-based-analysis-of-stent-performance-its-association-with-valvular-calcification-and-residual-aortic-regurgitation-after-implantation-of-a-balloon-expandable-transcatheter-heart-valve
#2
Julius Gerstmeyer, Maximilian Kütting, Buntaro Fujita, Annika Schuhbäck, Martin Arnold, Jochen Börgermann, Stephan Achenbach, Ulrich Steinseifer, Jan Gummert, Stephan Ensminger
OBJECTIVES: The aim of this study was to investigate the mutual influence of valvular calcifications and transcatheter aortic valve stent geometry during and after implantation of a balloon-expandable SAPIEN(®)/SAPIEN XT(®) prostheses. Aortic valve calcification has been linked with adverse complications after transcatheter aortic valve implantation (TAVI). However, little is known about the fate of the calcifications after TAVI as well as its influence on transcatheter heart valve geometry...
January 20, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28034635/patient-specific-bone-mineral-density-distribution-in-the-tibia-of-individuals-with-chronic-spinal-cord-injury-derived-from-multi-slice-peripheral-quantitative-computed-tomography-pqct-a-cross-sectional-study
#3
Sylvie Coupaud, Magnus K Gislason, Mariel Purcell, Keisuke Sasagawa, K Elizabeth Tanner
BACKGROUND: The high risk of fracture associated with chronic spinal cord injury (SCI) is attributed to extensive disuse-related bone loss in previously weight-bearing long bones. Changes in bone mineral density (BMD) after SCI have been documented extensively for the epiphyses of the tibia and femur, fracture-prone sites in this patient group. Less attention has been given to patterns of cortical bone loss in the diaphyses, but variability in BMD distributions throughout the long bones may contribute to some patients' increased susceptibility to shaft fractures in chronic SCI...
December 26, 2016: Bone
https://www.readbyqxmd.com/read/28018068/customized-iliac-prosthesis-for-reconstruction-in-giant-cell-tumour-a-unique-treatment-approach
#4
Tarun Verma, Ankur Sharma, Amit Sharma, Lalit Maini
Giant cell tumour (GCT) of flat bones of pelvis is extremely rare. GCT of the ilium and ischium represent less than 0.05% of all GCT. Iliac bone GCT has been treated traditionally by intra-lesion curettage with bone grafting, wide resection with or without reconstruction and hemi-pelvectomy in very aggressive tumours. None of the above treatments were without morbidities. Reconstruction using bone grafts and bone cement has also been inadequate. In GCT, where life expectancy is not decreased significantly, surgical treatment should be aimed at giving optimum functional outcome...
October 2016: Journal of Clinical Orthopaedics and Trauma
https://www.readbyqxmd.com/read/27977586/application-of-a-3-dimensional-printed-navigation-template-in-bernese-periacetabular-osteotomies-a-cadaveric-study
#5
You Zhou, Xiaopeng Kang, Chuan Li, Xiaoshan Xu, Rong Li, Jun Wang, Wei Li, Haotian Luo, Sheng Lu
The aim of the present study was to describe the application of 3D printed templates for intraoperative navigation and simulation of periacetabular osteotomies (PAOs) in a cadaveric model.Five cadaveric specimens (10 sides) underwent thin-slice computed tomographic scans of the ala of ilium downwards to the proximal end of femoral shaft. Bernese PAO was performed. Using Mimics v10.1 software (Materialise, Leuven, Belgium), 3D computed tomographic reconstructions were created and the 4 standard PAO bone cuts-ischial, pubic, anterior, and posterior aspects of the ilium-as well as rotation of the dislocated acetabular bone blocks were simulated for each specimen...
December 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27822004/the-morphometric-anatomy-of-the-delto-fulcral-triangle-a-3d-ct-based-reconstruction-study
#6
N Naidoo, L Lazarus, K S Satyapal, L De Wilde, A Van Tongel
This study introduced the new delto-fulcral triangle (DFT), the first anatomical model of its kind. As seen from the orthopaedician's supraspinatus-outlet view, the antero-superior point of the coracoid process along with the lateral- and posterior-most acromial landmarks form the boundaries of the DFT. Since these osseous scapular landmarks accounted for both dynamic and static stabilisers of the glenohumeral joint, knowledge of the anatomical features of the DFT may prove beneficial to the orthopaedic surgeon...
March 2017: Journal of Orthopaedics
https://www.readbyqxmd.com/read/27718360/does-mandibular-distraction-vector-influence-airway-volumes-and-outcome
#7
Elizabeth G Zellner, Julie M Mhlaba, Russell R Reid, Derek M Steinbacher
PURPOSE: The goal of mandibular distraction in the Pierre-Robin sequence is to maximally expand the oropharyngeal airway. It has been hypothesized that a steep oblique distraction vector might allow greater airway enlargement compared with horizontal distraction. This study compared vector orientation in relation to airway volume and overall clinical outcome. MATERIALS AND METHODS: Micrognathic infants who underwent mandibular distraction with sufficient computed tomographic data were retrospectively reviewed...
January 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/27563623/crouzon-syndrome-virtual-planning-of-surgical-treatment-by-application-of-internal-distractors
#8
Chingiz Rahimov, Ruslan Asadov, Gunel Hajiyeva, Nazim Verdiyev, Zaur Novruzov, Ismayil Farzaliyev
Crouzon syndrome is one of the frequent pathologies within craniosynostosis syndrome. Current progress in computers and biotechnologies allows improving surgical approach and forecasting final result of reconstruction as well. We present a case of successful surgical treatment of Crouzon syndrome, done by application of virtual planning allowing determining "monobloc" features, type of reconstruction and distraction protocol as well. A 20-year-old female had presented with craniofacial deformity. Clinical and radiological investigation revealed Crouzon syndrome...
January 2016: Annals of Maxillofacial Surgery
https://www.readbyqxmd.com/read/27506462/impact-of-three-dimensional-printed-pelvicaliceal-system-models-on-residents-understanding-of-pelvicaliceal-system-anatomy-before-percutaneous-nephrolithotripsy-surgery-a-pilot-study
#9
Hasan Anıl Atalay, Volkan Ülker, İlter Alkan, Halil Lütfi Canat, Ünsal Özkuvancı, Fatih Altunrende
OBJECTIVE: To investigate the impact of three-dimensional (3D) printed pelvicaliceal system models on residents' understanding of pelvicaliceal system anatomy before percutaneous nephrolithotripsy (PCNL). MATERIALS AND METHODS: Patients with unilateral complex renal stones indicating PCNL were selected. Usable data of patients were obtained from CT-scans in Digital Imaging and Communications in Medicine (DICOM) format. Mimics software version 16.0 (Materialise, Belgium) was used for segmentation and extraction of pelvicaliceal systems (PCSs)...
October 2016: Journal of Endourology
https://www.readbyqxmd.com/read/27476365/biomechanical-effects-of-maxillary-expansion-on-a-patient-with-cleft-palate-a-finite-element-analysis
#10
Haofu Lee, Alan Nguyen, Christine Hong, Paul Hoang, John Pham, Kang Ting
INTRODUCTION: The aims of this study were to evaluate the effects of rapid palatal expansion on the craniofacial skeleton of a patient with unilateral cleft lip and palate (UCLP) and to predict the points of force application for optimal expansion using a 3-dimensional finite element model. METHODS: A 3-dimensional finite element model of the craniofacial complex with UCLP was generated from spiral computed tomographic scans with imaging software (Mimics, version 13...
August 2016: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/27270544/accuracy-assessment-of-three-dimensional-surface-reconstructions-of-in-vivo-teeth-from-cone-beam-computed-tomography
#11
Yan-Hui Sang, Hong-Cheng Hu, Song-He Lu, Yu-Wei Wu, Wei-Ran Li, Zhi-Hui Tang
BACKGROUND: The accuracy of three-dimensional (3D) reconstructions from cone-beam computed tomography (CBCT) has been particularly important in dentistry, which will affect the effectiveness of diagnosis, treatment plan, and outcome in clinical practice. The aims of this study were to assess the linear, volumetric, and geometric accuracy of 3D reconstructions from CBCT and to investigate the influence of voxel size and CBCT system on the reconstructions results. METHODS: Fifty teeth from 18 orthodontic patients were assigned to three groups as NewTom VG 0...
June 20, 2016: Chinese Medical Journal
https://www.readbyqxmd.com/read/27170842/a-systematic-review-of-image-segmentation-methodology-used-in-the-additive-manufacture-of-patient-specific-3d-printed-models-of-the-cardiovascular-system
#12
N Byrne, M Velasco Forte, A Tandon, I Valverde, T Hussain
BACKGROUND: Shortcomings in existing methods of image segmentation preclude the widespread adoption of patient-specific 3D printing as a routine decision-making tool in the care of those with congenital heart disease. We sought to determine the range of cardiovascular segmentation methods and how long each of these methods takes. METHODS: A systematic review of literature was undertaken. Medical imaging modality, segmentation methods, segmentation time, segmentation descriptive quality (SDQ) and segmentation software were recorded...
January 2016: JRSM Cardiovascular Disease
https://www.readbyqxmd.com/read/27007950/endocranial-morphology-of-the-primitive-nodosaurid-dinosaur-pawpawsaurus-campbelli-from-the-early-cretaceous-of-north-america
#13
Ariana Paulina-Carabajal, Yuong-Nam Lee, Louis L Jacobs
BACKGROUND: Ankylosaurs are one of the least explored clades of dinosaurs regarding endocranial anatomy, with few available descriptions of braincase anatomy and even less information on brain and inner ear morphologies. The main goal of this study is to provide a detailed description of the braincase and internal structures of the Early Cretaceous nodosaurid Pawpawsaurus campbelli, based on recently made CT scans. METHODOLOGY/PRINCIPAL FINDINGS: The skull of Pawpawsaurus was CT scanned at University of Texas at Austin (UTCT)...
2016: PloS One
https://www.readbyqxmd.com/read/26949129/correlation-between-hyoid-bone-position-and-airway-dimensions-in-chinese-adolescents-by-cone-beam-computed-tomography-analysis
#14
Y-Y Jiang
This study aimed to investigate the correlation between upper airway dimensions and hyoid bone position in Chinese adolescents based on cone beam computed tomography (CBCT) images. CBCT images from a total of 254 study subjects were included. The upper airway and hyoid bone parameters were measured by Materialism's interactive medical image control system (MIMICS) v.16.01 (Materialise, Leuven, Belgium). The airway dimensions were evaluated in terms of volume, cross-sectional area (CSA), mean CSA, length, anteroposterior dimension of the cross-section (AP), lateral dimension of the cross-section (LAT), and LAT/AP ratio...
July 2016: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/26913140/finite-element-modelling-of-the-femur-bone-of-a-subject-suffering-from-motor-neuron-lesion-subjected-to-electrical-stimulation
#15
Magnus K Gislason, Páll Ingvarsson, Paolo Gargiulo, Stefán Yngvason, Vilborg Guðmundsdóttir, Sigrún Knútsdóttir, Þórður Helgason
Bone loss and a decrease in bone mineral density is frequently seen in patients with motor neuron lesion due to lack of mechanical stimulation. This causes weakening of the bones and a greater risk of fracture. By using functional electrical stimulation it is possible to activate muscles in the body to produce the necessary muscle force to stimulate muscle growth and potentially decrease the rate of bone loss. A longitudinal study was carried out on a single patient undergoing electrical stimulation over a 6 year period...
September 23, 2014: European Journal of Translational Myology
https://www.readbyqxmd.com/read/26855859/the-feasibility-and-radiological-features-of-sacral-alar-iliac-fixation-in-an-adult-population-a-3d-imaging-study
#16
Ai-Min Wu, Yong-Long Chi, Wen-Fei Ni, Yi-Xing Huang
BACKGROUND: Surgical treatments for adult spinal deformities often include pelvic fixation, and the feasibility of sacral-2 alar iliac (S2AI) screw fixation has been shown previously. However, sometimes S2AI screw fixation cannot be applied due to the presence of an osteolytic lesion or trauma or because the biomechanical properties of only an S2AI screw is insufficient. Therefore, we questioned the feasibility of using sacral AI screws in other segments and determined whether S3AI and S4AI screws have the potential to be used for sacral fractures...
2016: PeerJ
https://www.readbyqxmd.com/read/26827979/evaluation-of-facial-hard-and-soft-tissue-asymmetry-using-cone-beam-computed-tomography
#17
COMPARATIVE STUDY
Rahime Burcu Nur, Derya Germeç Çakan, Tülin Arun
INTRODUCTION: The purposes of this study were to (1) evaluate facial asymmetry 3 dimensionally using cone-beam computed tomography (CBCT) and (2) compare the right and left facial hard and soft tissues volumetrically and their interferences on each other. METHODS: The CBCT data of 49 asymmetric (soft tissue menton deviation, ≥4 mm; distance from the facial midline) (mean age, 19.9 ± 5.6 years) and 39 symmetric patients (soft tissue menton deviation, <4 mm) (mean age, 17...
February 2016: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/26788498/a-new-measurement-technique-of-the-characteristics-of-nutrient-artery-canals-in-tibias-using-materialise-s-interactive-medical-image-control-system-software
#18
Jiantao Li, Hao Zhang, Peng Yin, Xiuyun Su, Zhe Zhao, Jianfeng Zhou, Chen Li, Zhirui Li, Lihai Zhang, Peifu Tang
We established a novel measurement technique to evaluate the anatomic information of nutrient artery canals using Mimics (Materialise's Interactive Medical Image Control System) software, which will provide full knowledge of nutrient artery canals to assist in the diagnosis of longitudinal fractures of tibia and choosing an optimal therapy. Here we collected Digital Imaging and Communications in Medicine (DICOM) format of 199 patients hospitalized in our hospital. All three-dimensional models of tibia in Mimics were reconstructed...
2015: BioMed Research International
https://www.readbyqxmd.com/read/26558322/study-of-contact-characteristics-between-a-respirator-and-a-headform
#19
Mang Cai, Shengnan Shen, Hui Li, Xiaotie Zhang, Yanzhao Ma
This article presents a computational study on contact characteristics of contact pressure and resultant deformation between an N95 filtering facepiece respirator and a newly developed digital headform. The geometry of the headform model is obtained based on computed tomography scanning of a volunteer. The segmentation and reconstruction of the headform model is performed by Mimics v16.0 (Materialise, Leuven, Belgium), which is a medical image processing software. The respirator model is obtained by scanning the surface of a 3M 8210 N95 respirator using a 3D digitizer and then the model is transformed by Geomagic Studio v12...
2016: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/26545217/the-lumbar-artery-perforator-flap-3-dimensional-anatomical-study-and-clinical-applications
#20
Mary Beth Bissell, David T Greenspun, Josh Levine, William Rahal, Ammar Al-Dhamin, Ali AlKhawaji, Steven F Morris
BACKGROUND: The lumbar region is a potential donor site for perforator-based rotational or free flaps or as a recipient site for free flaps to obtain coverage for deficits in the sacral region. Because of the lack of consensus regarding the microvascular anatomy of this potential flap site, a robust investigation of the anatomy of this region is required. METHODS: Three-dimensional reconstructions (n = 6) of the microvasculature of the lumbar region were generated using MIMICS software (Materialise, Belgium) for each of the four paired lumbar vessels...
October 2016: Annals of Plastic Surgery
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