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Total shoulder inverted

Chen-Ket Chai, Ali C Akyildiz, Lambert Speelman, Frank J H Gijsen, Cees W J Oomens, Marc R H M van Sambeek, Aad van der Lugt, Frank P T Baaijens
Biomechanical models have the potential to predict failure of atherosclerotic plaques and to improve the risk assessment of plaque rupture. The applicability of these models depends strongly on the used material models. Current biomechanical models employ isotropic material models, although it is generally accepted that plaque tissue behaves highly anisotropic. The aim of the present study is to determine the local anisotropic mechanical properties of human atherosclerotic plaque tissue by means of micro-indentation tests...
March 2015: Journal of the Mechanical Behavior of Biomedical Materials
Ulrich Irlenbusch, Max J Kääb, George Kohut, Jerome Proust, Falk Reuther, Thierry Joudet
INTRODUCTION: This study documents 2-year clinical and radiographic results following reversed total shoulder arthroplasty using a novel prosthesis with inverted bearing materials (polyethylene glenoid; metal humeral component). This design was intended to avoid massive PE abrasion on the humeral side. Therefore, we predicted a lack of subsequent osteolysis-induced exacerbation of scapular notching, and because of other design features and modified operating technique a reduced notching rate...
February 2015: Archives of Orthopaedic and Trauma Surgery
R D Bannister, R V Roudsari, J D Satterthwaite
OBJECTIVE: To determine the thickness of resin layer formed when dentin desensitizing agents are applied to teeth prepared for full crown restorations. DESIGN: In vitro measurements of resin layer thickness. METHODS AND MATERIALS: Forty caries-free human premolar teeth were prepared as for a full metal-ceramic crown restoration with a retention groove placed mesiobuccally. Stratified allocation created five groups of eight teeth, which were treated with various desensitizing agents...
November 2014: Operative Dentistry
Eric M Schearer, Yu-Wei Liao, Eric J Perreault, Matthew C Tresch, William D Memberg, Robert F Kirsch, Kevin M Lynch
We present a method for controlling a neuroprosthesis for a paralyzed human arm using functional electrical stimulation (FES) and characterize the errors of the controller. The subject has surgically implanted electrodes for stimulating muscles in her shoulder and arm. Using input/output data, a model mapping muscle stimulations to isometric endpoint forces measured at the subject's hand was identified. We inverted the model of this redundant and coupled multiple-input multiple-output system by minimizing muscle activations and used this inverse for feedforward control...
May 2014: IEEE Transactions on Neural Systems and Rehabilitation Engineering
Georges Kohut, Frank Dallmann, Ulrich Irlenbusch
The notching phenomenon is one of the major concerns with reversed total shoulder arthroplasty. Repetitive contact between the humeral implant and the scapula (mechanical notching) produces progressive abrasion of the implant if the moving part is made of polyethylene. Its debris may then lead to active osteolysis (biological notching). Inversion of bearing materials, i.e. Glenosphere made of polyethylene and humeral Inlay made of metal, aims at the reduction of this phenomenon. However, the question arises if the tribological behavior would then be different...
February 2, 2012: Journal of Biomechanics
Luke Austin, Benjamin Zmistowski, Bradford Tucker, Robin Hetrick, Patrick Curry, Gerald Williams
BACKGROUND: Venous air embolism is a rare but potentially fatal complication of arthroscopy. Fatal venous air embolism has been reported with as little as 100 mL of air entering the venous system. During liquid-only arthroscopy, avenues for air introduction into the joint are limited. Therefore, we hypothesized that commercially prepared 3-L saline-solution bags are a source of potentially fatal amounts of gas that can be introduced into the joint by arthroscopic pumps. METHODS: Eight 3-L arthroscopic saline-solution bags were obtained and visually inspected for air...
September 1, 2010: Journal of Bone and Joint Surgery. American Volume
Asif Amirali, Liancai Mu, Jean-Michel Gracies, David M Simpson
OBJECTIVES: : Botulinum neurotoxin (BoNT) reduces disabling muscle contraction in numerous disorders with muscle overactivity. While motor endplates are the primary site of action for BoNT, their location is unknown in most human muscles. This study localized the motor endplate bands (MEB) within human biceps brachii (BB) muscles in relation to external landmarks. METHODS: : Five human BB muscles were obtained from autopsy. Three muscles were processed for Sihler's stain, a nerve staining technique, and 2 were processed by whole-mount acetylcholinesterase stain...
December 2007: Journal of Clinical Neuromuscular Disease
Stephen S Burkhart, Joe F De Beer, Johannes R H Barth, Tim Cresswell, Tim Criswell, Chris Roberts, David P Richards
PURPOSE: The purpose of this study was to analyze the results of the modified Latarjet procedure for shoulder instability associated with an inverted-pear glenoid (bone loss of at least 25% of the width of the inferior glenoid) or an engaging Hill-Sachs lesion. METHODS: From March 1996 to December 2002, 102 patients underwent an open Latarjet procedure for shoulder instability with an inverted-pear glenoid, with or without an associated engaging Hill-Sachs lesion, by the 2 senior authors (S...
October 2007: Arthroscopy: the Journal of Arthroscopic & related Surgery
Qingwei Yin, Yi Jiang, Lianping Xiao
OBJECTIVE: To estimate the clinical curative effect of replacement of invert-type artificial total scapula and shoulder joint prosthesis and reserving arm with rehabilitation of function in the treatment of.malignant tumor in shoulder. METHODS: From February 2001 and November 2004, five youth patients with primary malignant shoulder tumors were treated operatively by resection of neoplasms thoroughly, replacement of invert-type artificial total shoulder blade and joint prosthesis, the functional reconstruction...
March 2007: Chinese Journal of Reparative and Reconstructive Surgery
F Sirveaux, L Favard, D Oudet, D Huquet, G Walch, D Molé
We reviewed 80 shoulders (77 patients) at a mean follow-up of 44 months after insertion of a Grammont inverted shoulder prosthesis. Three implants had failed and had been revised. The mean Constant score had increased from 22.6 points pre-operatively to 65.6 points at review. In 96% of these shoulders there was no or only minimal pain. The mean active forward elevation increased from 73 degrees to 138 degrees. The integrity of teres minor is essential for the recovery of external rotation and significantly influenced the Constant score...
April 2004: Journal of Bone and Joint Surgery. British Volume
L Neyton, F Sirveaux, O Roche, D Molé, P Boileau, G Walch
PURPOSE OF THE STUDY: The purpose of this study was to assess outcome after revision total shoulder arthroplasty as a function of therapeutic options. MATERIAL AND METHODS: Revision total shoulder arthroplasty procedures were performed in three French centers specialized in shoulder surgery. Mean follow-up was 28.5 Months (range 12-69). Constant's score was determined preoperatively and at last follow-up. Nineteen reimplantations of a cemented glenoid, twelve "glenoplasties" without reimplantation and five inverted prosthesis implantations were performed...
April 2004: Revue de Chirurgie Orthopédique et Réparatrice de L'appareil Moteur
C Delloye, D Joris, A Colette, A Eudier, J E Dubuc
Our series of inverted prosthesis included 5 patients with a mean age of 73 +/- 6 years. In 4 cases, the implant was performed as a surgical revision. The follow up was 81 +/- 15 months. Three shoulders were pain free whereas two caused a dull pain after a free interval due to mechanical complications. The mean active elevation was 72 degrees while external rotation was - 2 degrees. The adjusted Constant score passed from 32 to 60. In case of complications, the score dropped to 32. Mechanical complications were important with in one case, an unscrening of the glenosphere and in two cases, a loosening of the glenoid prosthesis...
June 2002: Revue de Chirurgie Orthopédique et Réparatrice de L'appareil Moteur
P Renaud, H Wahab, L Bontoux, M Dauty, I Richard, C Brégeon
OBJECTIVE: Evaluation of the functional results of the Delta 3 inverted shoulder prosthesis and determination of a radio-anatomical index predictive of best functional outcome. PATIENTS AND METHODS: Retrospective analysis of 19 patients (21 shoulders). Clinical (pain, satisfaction, amplitudes, Constant index) and radiological (acromio-epiphyseal distance) evaluation at a mean follow up of 13.6 months. RESULTS: Outcomes concerning pain, quality of life and Constant index were good and similar to other series...
2001: Annales de Réadaptation et de Médecine Physique
L A Elders, A Burdorf
OBJECTIVES: To assess with a cross sectional study the interrelations between physical, psychosocial, and individual risk factors and different end points of low back pain. METHODS: In total, 229 scaffolders and 59 supervisors completed a questionnaire about manual handling of materials, awkward back posture, strenuous arm position, perceived exertion, psychosocial load, need for recovery, and general health. Physical load at the worksite was also measured with many frequent observations...
September 2001: Occupational and Environmental Medicine
P J Hadley, J S Holder, M H Hinton
The fleece of sheep becomes soiled primarily on the abdomen and on the legs. A five-category scoring scale for soiling of the fleece was defined, with score 1 being clean and dry and score 5 being wet and heavily soiled with faecal material. Twenty sheep with each fleece score were slaughtered and dressed on a commercial 'inverted' slaughter line. Swab samples were taken from the shoulder and the abdomen of the carcases immediately after skinning, and total viable counts and the numbers of Enterobacteriaceae were determined...
May 31, 1997: Veterinary Record
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