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Glenoid Component Migration in Total Shoulder Arthroplasty: A Case Report.
Thomas Saliba1, Sanjiva Pather1
1Hôpital de Braine L'Alleud, Rue Wayez 35, 1420 Braine-l'Alleud, Belgium.
Journal of the Belgian Society of Radiology
|July 21, 2025
Summary
Glenoid component migration after shoulder replacement can cause failure. This case shows a displaced polyethylene spacer, missed on X-rays, highlighting the need to verify component positioning.
Area of Science:
- Orthopedic Surgery
- Biomaterials Science
- Radiology
Background:
- Glenoid component migration is a significant cause of total shoulder arthroplasty failure.
- Radiolucent polyethylene components pose diagnostic challenges for loosening and migration detection.
Observation:
- A 72-year-old woman presented with shoulder pain three years after arthroplasty.
- Initial radiographs were unremarkable, but CT-arthrography revealed a displaced and rotated polyethylene spacer causing a mechanical block.
Findings:
- Retrospective X-ray analysis confirmed the spacer was not in its expected position.
- The displaced polyethylene spacer was successfully repositioned surgically, restoring function.
Implications:
- This case underscores the diagnostic difficulties associated with radiolucent glenoid components.
- Emphasizes the importance of verifying glenoid component positioning in shoulder arthroplasties, especially with unexplained pain.
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