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Reverse Total Shoulder Arthroplasty
Published on: July 5, 2011
Observations on retrieved glenoid components from total shoulder arthroplasty
Shane J Nho1, Denis Nam, Owen L Ala
1Sports Medicine and Shoulder Service, Department of Orthopedic Surgery, Hospital for Special Surgery, Weill Medical College of Cornell University, New York, New York 10021, USA.
Journal of Shoulder and Elbow Surgery
|February 19, 2009
Summary
Analysis of retrieved glenoid components reveals polyethylene wear, particularly in the inferior quadrant, linked to impingement and loosening. Radiographs underestimated loosening, highlighting the need for comprehensive assessment in shoulder arthroplasty.
Area of Science:
- Orthopedic Surgery
- Biomaterials Science
- Medical Device Analysis
Background:
- Previous studies focused on knee and hip replacements, with limited data on retrieved glenoid components.
- Understanding factors affecting glenoid implant performance is crucial for improving shoulder arthroplasty outcomes.
Purpose of the Study:
- To analyze damage modes and wear patterns in retrieved glenoid components.
- To investigate the association between damage patterns, impingement, and glenoid loosening.
- To evaluate the efficacy of radiographic assessment in detecting glenoid loosening.
Main Methods:
- Analysis of 78 retrieved glenoid components from 73 patients undergoing revision surgery.
- Assessment of 9 damage modes across 4 quadrants of the bearing surface.
- Scoring of pre-removal radiographs using an adapted radiolucency score.
Main Results:
- Scratching, pitting, and burnishing were the most prevalent and severe polyethylene wear types.
- Damage was concentrated in the inferior quadrant, suggesting impingement-related loosening.
- Radiographic analysis significantly underestimated the clinical presence of glenoid loosening.
Conclusions:
- Glenoid impingement and edge deformation are strongly associated with glenoid loosening.
- Analysis of retrieved components offers critical insights into glenoid component failure mechanisms.
- Comprehensive evaluation of patient, design, and surgical factors is essential for understanding component failure.