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Extracellular matrix metalloproteinases around loose total hip prostheses
M Takagi1, Y T Konttinen, S Santavirta
1Department of Anatomy, University of Helsinki, Finland.
Acta Orthopaedica Scandinavica
|June 1, 1994
Summary
Matrix metalloproteinases (MMPs) like MMP-1, MMP-2, MMP-3, and MMP-9 are prevalent in tissues surrounding loose hip prostheses, suggesting their role in connective tissue weakening and implant loosening. MMP-8 was mainly found in inflammatory cells.
Area of Science:
- Biochemistry
- Orthopedic Surgery
- Immunohistochemistry
Background:
- Extracellular matrix metalloproteinases (MMPs) are crucial for tissue remodeling.
- Implant loosening is a significant complication in hip arthroplasty.
- Understanding the role of MMPs in periprosthetic tissues is vital.
Purpose of the Study:
- To investigate the tissue localization of specific MMPs (MMP-1, MMP-2, MMP-3, MMP-8, MMP-9) around loose hip prostheses.
- To compare MMP expression in loose hip prostheses with synovial tissues from hip fractures.
Main Methods:
- Immunohistochemistry using MMP-specific antisera and the avidin-biotin-peroxidase complex method.
- Analysis of tissue samples from loose hip prostheses and hip fractures.
Main Results:
- MMP-1, MMP-2, MMP-3, and MMP-9 were abundant in interface and pseudocapsular tissues around loose hip prostheses.
- MMP-8 was occasionally found in polymorphonuclear leukocytes in loose prosthesis tissues.
- MMP expression was generally weaker in synovial tissues from hip fractures compared to loose prosthesis tissues.
Conclusions:
- The presence of MMP-1, MMP-2, MMP-3, and MMP-9 in periprosthetic tissues suggests their involvement in connective tissue degradation leading to hip prosthesis loosening.
- MMP-8 localization indicates a role in acute inflammatory responses.