In-vitro evaluation of a polyurethane compliant-layer glenoid for use in shoulder arthroplasty

2009 ◽  
Vol 224 (4) ◽  
pp. 551-563 ◽  
Author(s):  
C Geary ◽  
E Jones ◽  
D Fitzpatrick ◽  
C P Kelly ◽  
C Birkinshaw
Keyword(s):  
Shoulder Arthroplasty ◽  
Friction And Wear ◽  
Total Shoulder Arthroplasty ◽  
Glenoid Component ◽  
Wear Performance ◽  
In Vitro Evaluation ◽  
Biomimetic Approach ◽  
Compliant Layer ◽  
Ultra High Molecular Weight

A polyurethane glenoid component has been designed and manufactured as part of a total shoulder arthroplasty (TSA) system based on compliant-layer (CL) technology. Compared with conventional TSA designs, this biomimetic approach offers reduced friction and wear and potentially improved longevity. In-vitro evaluation of the glenoid system has included loosening and stability tests, and wear measurement using a specially constructed wear simulator. The results obtained support the hypothesis that a CL glenoid design may provide improved resistance to dynamic loosening and rim erosion, and demonstrate superior wear performance over a standard ultra-high molecular weight polyethylene design. This study not only confirms the feasibility of a CL glenoid component but also highlights the potential to increase implant longevity, thereby allowing earlier surgical intervention before poor glenoid bone stock and soft tissue compromise the outcome of TSA.

scholarly journals Wear performance of inverted non-conforming bearings in anatomic total shoulder arthroplasty

2019 ◽  
Vol 12 (1_suppl) ◽  
pp. 40-52
Author(s):  
Lorenzo Banci ◽  
Alessio Meoli ◽  
Martin Hintner ◽  
Hans Rudolf Bloch
Keyword(s):  
Vitamin E ◽  
Wear Rate ◽  
Shoulder Arthroplasty ◽  
Humeral Head ◽  
Total Shoulder Arthroplasty ◽  
Niobium Nitride ◽  
Shoulder Prosthesis ◽  
Glenoid Component ◽  
Uhmwpe Wear

Background Glenoid component failures still represent the most common complication in total shoulder arthroplasty. These failures depend on several factors, including ultra-high molecular weight polyethylene (UHMWPE) wear. One reason for UHMWPE wear in total shoulder arthroplasty may be the current use of a spherical prosthetic humeral head against a radially mismatched UHMWPE glenoid component, which leads to reduced glenohumeral translations, glenoid edge loading and high translational forces during shoulder motions. The aim of this study was to assess the in vitro wear of an anatomic total shoulder prosthesis with non-spherical non-conforming bearings with inverted conventional materials. Methods The wear of a vitamin E-blended UHMWPE non-spherical humeral head articulating against a non-conforming titanium-niobium nitride (TiNbN)-coated metallic glenoid was tested using a joint simulator. The wear test was performed by applying a constant load of 756 N with angular motions and translations. Results After 2.5 million cycles, the mean wear rate of the humeral head was 0.28 ± standard deviation (SD) 0.45 mg/million cycles. Conclusion The low wear rate of the vitamin E UHMWPE humeral head supports the use of non-spherical non-conforming bearings with inverted conventional materials in anatomic total shoulder arthroplasty.

Failure of the Glenoid Component in Anatomic Total Shoulder Arthroplasty

2013 ◽  
Vol 95 (24) ◽  
pp. 2205-2212 ◽  
Author(s):  
Anastasios Papadonikolakis ◽  
Moni Blazej Neradilek ◽  
Frederick A Matsen
Keyword(s):  
Shoulder Arthroplasty ◽  
Total Shoulder Arthroplasty ◽  
Glenoid Component

scholarly journals Journey of the glenoid in anatomic total shoulder replacement

2018 ◽  
Vol 11 (2) ◽  
pp. 140-148 ◽  
Author(s):  
Alessandro Castagna ◽  
Raffaele Garofalo
Keyword(s):  
Shoulder Arthroplasty ◽  
Current Practice ◽  
Total Shoulder Arthroplasty ◽  
Shoulder Function ◽  
Patient Specific ◽  
Glenoid Component ◽  
Shoulder Replacement ◽  
Final Destination ◽  
Component Loosening

Anatomic total shoulder arthroplasty (TSR) has been shown to generate good to excellent results for patients with osteoarthritis and a functioning rotator cuff. Many studies have reported that the glenoid component loosening and failure remain the most common long-term complication of total shoulder arthroplasty. The approach to glenoid component is critical because a surgeon should consider patient-specific anatomy, preserving bone stock and joint line restoration, for a good and durable shoulder function. Over the years, different glenoid design and materials have been tried in various configurations. These include cemented polyethylene, uncemented metal-backed and hybrid implants. Although advances in biomechanics, design and tribology have improved our understanding of the glenoid, the journey of the glenoid component in anatomic total shoulder arthroplasty has not yet reached its final destination. This article attempts to describe the evolution of the glenoid component in anatomic TSR and current practice.

Use of a custom alignment guide to improve glenoid component position in total shoulder arthroplasty

2012 ◽  
Vol 21 (12) ◽  
pp. 2860-2866 ◽  
Author(s):  
Eduardo M. Suero ◽  
Musa Citak ◽  
Darrick Lo ◽  
Aaron J. Krych ◽  
Edward V. Craig ◽  
...  
Keyword(s):  
Shoulder Arthroplasty ◽  
Total Shoulder Arthroplasty ◽  
Glenoid Component ◽  
Component Position ◽  
Alignment Guide
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