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Anatomic metal back

M O Gauci, N Bonnevialle, G Moineau, M Baba, G Walch, P Boileau
Aims Controversy about the use of an anatomical total shoulder arthroplasty (aTSA) in young arthritic patients relates to which is the ideal form of fixation for the glenoid component: cemented or cementless. This study aimed to evaluate implant survival of aTSA when used in patients aged < 60 years with primary glenohumeral osteoarthritis (OA), and to compare the survival of cemented all-polyethylene and cementless metal-backed glenoid components. Materials and Methods A total of 69 consecutive aTSAs were performed in 67 patients aged < 60 years with primary glenohumeral OA...
April 1, 2018: Bone & Joint Journal
O Lorbach
IMPLANT DESIGNS: Within the last 50 years, implants for shoulder replacement have developed rapidly. Monobloc-stems in few sizes were changed to modular implant systems that allow for an individual adaption of the stem, as well as adaption of the humeral head component according to the specific anatomic situation of the patient. Moreover, stemless und short stem implants are available, which may highly simplify primary implantation, especially in posttraumatic cases as well as in revision cases with a need for removal or change of the implants...
May 2018: Der Orthopäde
Scott T Watson, Garland K Gudger, Catherine D Long, John M Tokish, Stefan J Tolan
BACKGROUND: As glenoid failure is one of the primary causes of failure of anatomic total shoulder arthroplasty (TSA), Trabecular Metal-backed glenoid components have become popular. This study reports implant survival and clinical outcomes of patients who received a Trabecular Metal-backed glenoid component during primary anatomic TSA. METHODS: Patients who underwent TSA with a Trabecular Metal-backed glenoid component by a single surgeon were identified and reviewed for clinical, radiographic, and patient-reported outcome measures with a minimum of 2 years' follow-up...
March 2018: Journal of Shoulder and Elbow Surgery
Jason E Hsu, Daniel J Hackett, Kiet V Vo, Frederick A Matsen
BACKGROUND: Glenoid component failure is a prevalent mechanical complication of anatomic total shoulder arthroplasty. The objective of this study was to identify surgeon-controlled factors that may be addressed to reduce the rate of glenoid component failure that is sufficiently symptomatic to merit surgical revision. METHODS: We reviewed the clinical and radiographic features of 215 total shoulder arthroplasties that we revised for symptomatic glenoid component failure...
March 2018: Journal of Shoulder and Elbow Surgery
Felix E Diehn, Gregory J Michalak, David R DeLone, Amy L Kotsenas, E Paul Lindell, Norbert G Campeau, Ahmed F Halaweish, Cynthia H McCollough, Joel G Fletcher
Background: Dental hardware produces streak artifacts on computed tomography (CT) images reconstructed with the standard weighted filtered back projection (wFBP) method. Purpose: To perform a preliminary evaluation of an iterative metal artifact reduction (IMAR) technique to assess its ability to improve anatomic visualization over wFBP in patients with dental amalgam or other hardware. Material and Methods: CT images from patients with dental hardware were reconstructed using wFBP and IMAR software and soft-tissue or bone window/level settings...
November 2017: Acta Radiologica Open
Lars V von Engelhardt, Michael Manzke, Andreas Breil-Wirth, Timm J Filler, Joerg Jerosch
AIM: To evaluate the joint geometry and the clinical outcome of stemless, anatomical shoulder arthroplasty with the TESS system. METHODS: Twenty-one shoulders with a mean follow-up 18 of months were included. On scaled digital radiographs the premorbid center of rotation (CoR) was assessed and compared to the CoR of the prosthesis by using the MediCAD® software. Additionally, the pre- and post-operative geometry of the CoR was assessed in relation to the glenoid, the acromion as well as to the proximal humerus...
October 18, 2017: World Journal of Orthopedics
Christian Ziemann, Maik Stille, Florian Cremers, Dirk Rades, Thorsten M Buzug
BACKGROUND: The quality of CT slices can be drastically reduced in the presence of high-density objects such as metal implants within the patients' body due to the occurrence of streaking artifacts. Consequently, a delineation of anatomical structures might not be possible, which strongly influences clinical examination. PURPOSE: The aim of the study is to clinically evaluate the retrieval of attenuation values and structures by the recently proposed Augmented Likelihood Image Reconstruction (ALIR) and linear interpolation in the presence of metal artifacts...
January 2017: Journal of Applied Clinical Medical Physics
Jean Kany, Jijo Jose, Denis Katz, Jean-David Werthel, Padmanaban Sekaran, Rajkumar S Amaravathi, Philippe Valenti
BACKGROUND: Instability is one of the major causes of failures in unconstrained anatomic total shoulder arthroplasty (TSA). This study reviewed the instabilities that may occur in an anatomic shoulder platform system to identify its potential predictors. We hypothesized that soft tissue deficiency was the main cause of instability and that the best treatment option would be conversion to a reverse shoulder arthroplasty (RSA). MATERIALS AND METHODS: Between 2003 and 2013, we reviewed 27 patients who experienced postoperative instability, and the overall incidence was 5...
August 2017: Journal of Shoulder and Elbow Surgery
J Aissa, C Thomas, L M Sawicki, J Caspers, P Kröpil, G Antoch, J Boos
AIM: To investigate the value of dedicated computed tomography (CT) iterative metal artefact reduction (iMAR) algorithms in patients after spinal instrumentation. MATERIALS AND METHODS: Post-surgical spinal CT images of 24 patients performed between March 2015 and July 2016 were retrospectively included. Images were reconstructed with standard weighted filtered back projection (WFBP) and with two dedicated iMAR algorithms (iMAR-Algo1, adjusted to spinal instrumentations and iMAR-Algo2, adjusted to large metallic hip implants) using a medium smooth kernel (B30f) and a sharp kernel (B70f)...
May 2017: Clinical Radiology
S Vedantham, S Shrestha, L Shi, G Vijayaraghavan, A Karellas
PURPOSE: To optimize the cesium iodide (CsI:Tl) scintillator thickness in a complimentary metal-oxide semiconductor (CMOS)-based detector for use in dedicated cone-beam breast CT. METHODS: The imaging task considered was the detection of a microcalcification cluster comprising six 220µm diameter calcium carbonate spheres, arranged in the form of a regular pentagon with 2 mm spacing on its sides and a central calcification, similar to that in ACR-recommended mammography accreditation phantom, at a mean glandular dose of 4...
June 2016: Medical Physics
Wael Elabbassi, Arif Al Nooryani
We report on two cases in which Y-shaped coronary bifurcations were treated with the use of Bioresorbable scaffolds. The first case was of a 50-year-old man with NSTEMI. Coronary angiography showed stenosis involving a Y-shaped bifurcation of proximal to mid LAD and diagonal. The lesion was wired using two 0.14 BMW guide wires, followed by serial pre-dilatation of LAD and Diagonal branch. The stent into proximal LAD was deployed first as a skirt (3.5 × 12 BVS). Stent was post-dilated. A second 2.5 × 28 BVS was deployed into diagonal branch, protruding backwards; along with a 2...
June 2017: Cardiovascular Revascularization Medicine: Including Molecular Interventions
Sol Bee Han, Young Cheol Yoon, Jong Won Kwon
BACKGROUND AND PURPOSE: Slice-Encoding Metal Artifact Correction (SEMAC) sequence is one of the metal artifact reduction techniques of anatomical structure, but there has been no report about evaluation of post-operative complications. The purpose of this article is to compare the anatomical visibility between fast spin echo (FSE) and FSE-SEMAC and to evaluate the additional value of FSE-SEMAC in diagnostic confidence of the complications. MATERIALS AND METHODS: We conducted a retrospective study with 54 patients who received lumbar spinal surgery and MR images including FSE-SEMAC...
2016: PloS One
Joel Aissa, Johannes Boos, Christoph Schleich, Martin Sedlmair, Karl Krzymyk, Patric Kröpil, Gerald Antoch, Christoph Thomas
OBJECTIVES: Diagnostic accuracy of intraoperative computed tomography (CT) after deep brain stimulation (DBS) electrode placement is limited due to artifacts induced by the metallic hardware, which can potentially mask intracranial postoperative complications. Different metal artifact reduction (MAR) techniques have been introduced to reduce artifacts from metal hardware in CT. The purpose of this study was to assess the impact of a novel iterative MAR technique on image quality and diagnostic performance in the follow-up of patients with DBS electrode implementation surgery...
January 2017: Investigative Radiology
Haruhiko Machida, Toshiyuki Yuhara, Mieko Tamura, Takuya Ishikawa, Etsuko Tate, Eiko Ueno, Katelyn Nye, John M Sabol
With flat-panel detector mammography, radiography, and fluoroscopy systems, digital tomosynthesis (DT) has been recently introduced as an advanced clinical application that removes overlying structures, enhances local tissue separation, and provides depth information about structures of interest by providing high-quality tomographic images. DT images are generated from projection image data, typically using filtered back-projection or iterative reconstruction. These low-dose x-ray projection images are easily and swiftly acquired over a range of angles during a single linear or arc sweep of the x-ray tube assembly...
May 2016: Radiographics: a Review Publication of the Radiological Society of North America, Inc
Brian C Werner, Joshua S Dines, David M Dines
A platform system for shoulder arthroplasty can include a convertible modular humeral stem and/or a metal-backed glenoid component to facilitate straightforward conversion from either a hemiarthroplasty or anatomic total shoulder arthroplasty to a subsequent anatomic total shoulder arthroplasty, or more frequently, reverse total shoulder arthroplasty without any revision to the stem and/or glenoid baseplate. Recent studies have demonstrated a decreased rate of intraoperative humeral fracture, complications, and blood loss when a platform system is used and the humeral stem is not exchanged during revision arthroplasty...
March 2016: Current Reviews in Musculoskeletal Medicine
Thomas Obermeyer, Paul J Cagle, Bradford O Parsons, Evan L Flatow
Loosening of the glenoid remains one of the most common complications of total shoulder arthroplasty (TSA) and is the most cited reason for performing revision arthroplasty. Ingrowth metal-backed glenoid components offer the theoretical advantage of bone growth directly into the prosthesis with a single host-prosthesis interface. In the study reported here, we retrospectively reviewed the charts of patients who had TSAs performed by 2 fellowship-trained shoulder surgeons using glenoid components with porous tantalum anchors...
September 2015: American Journal of Orthopedics
A L Kotsenas, G J Michalak, D R DeLone, F E Diehn, K Grant, A F Halaweish, A Krauss, R Raupach, B Schmidt, C H McCollough, J G Fletcher
BACKGROUND AND PURPOSE: Metal-related artifacts from spine instrumentation can obscure relevant anatomy and pathology. We evaluated the ability of CT images reconstructed with and without iterative metal artifact reduction to visualize critical anatomic structures in postoperative spines and assessed the potential for implementation into clinical practice. MATERIALS AND METHODS: We archived CT projection data in patients with instrumented spinal fusion. CT images were reconstructed by using weighted filtered back-projection and iterative metal artifact reduction...
November 2015: AJNR. American Journal of Neuroradiology
Pascal Boileau, Grégory Moineau, Nicolas Morin-Salvo, Cyrille Avidor, Arnaud Godenèche, Christophe Lévigne, Mohamed Baba, Gilles Walch
BACKGROUND: The aims of this study were to determine the survival of anatomic total shoulder arthroplasty with uncemented metal-backed (MB) glenoid components with a polyethylene (PE) insert in primary osteoarthritis, to assess the reasons for revision surgery, and to identify patients and diagnostic factors that influence failure rates. METHODS: Between 1994 and 1999, 165 patients (mean age, 68 years) with primary osteoarthritis were treated with anatomic total shoulder arthroplasty using an uncemented MB/PE glenoid component...
October 2015: Journal of Shoulder and Elbow Surgery
Daphne Pinkas, Brett Wiater, J Michael Wiater
Ideal management of the glenoid in anatomic shoulder arthroplasty remains controversial. Glenoid component loosening remains a common source of clinical concern and, in young, active patients, implantation of a glenoid prosthesis is often avoided. Efforts to decrease glenoid loosening have resulted in changes to prosthetic design and implantation techniques. Currently, a wide variety of glenoid component options are available, including metal-backed or all-polyethylene, bone ingrowth or ongrowth, inset, and augmented designs...
May 2015: Journal of the American Academy of Orthopaedic Surgeons
C Quental, P R Fernandes, J Monteiro, J Folgado
According to Wolff's law, the changes in stress after a prosthesis implantation may modify the shape and internal structure of bone, thus compromising the long-term prosthesis fixation and, consequently, be a significant factor for glenoid loosening. The aim of the present study is to evaluate the changes in the bone adaptation process of the scapula after an anatomical and reverse total shoulder arthroplasty. Five finite element models of the implanted scapula are developed considering the implantation of three anatomical, cemented, all-polyethylene components; an anatomical, cementless, metal-backed component; and a reverse, all-metal component...
August 2014: Biomechanics and Modeling in Mechanobiology
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