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A pseudometallosis cyst associated with a Moore prosthesis. A case report
1Department of Surgery, University of Toronto, Ontario, Canada.
The Journal of Arthroplasty
|June 1, 1992
Summary
Black staining around a Moore prosthesis, initially suspected as metallosis, was found to be unrelated to metallic debris. This case highlights that dark debris in hip implants does not always indicate metallosis.
Area of Science:
- Orthopedic surgery
- Biomaterials science
- Medical device analysis
Background:
- Revision surgery for a Moore prosthesis after 28 years of implantation.
- Suspected metallosis due to collar-calcar contact as the reason for revision.
Observation:
- A supra-acetabular cyst was discovered during revision surgery.
- The cyst was filled with dark, black-stained debris.
Findings:
- Metallurgical analysis of the cyst material did not detect any metallic debris.
- The black staining was not indicative of metallosis in this specific case.
Implications:
- Challenges the assumption that black staining in hip implants solely signifies metallosis.
- Emphasizes the need for comprehensive analysis beyond visual inspection to diagnose implant-related issues.
- Suggests further investigation into the composition of non-metallic black debris in orthopedic implants.