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Immunohistochemical evaluation of interface membranes from failed cemented and uncemented acetabular components
L C Jones1, C Frondoza, D S Hungerford
1Division of Arthritis Surgery, Department of Orthopaedic Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA. lcj@welchlink.welch.jhu.edu
Journal of Biomedical Materials Research
|November 11, 1999
Summary
Failed hip replacements with cemented and cementless acetabular components show similar inflammatory cytokine profiles, suggesting a common pathway in aseptic loosening despite differing cellular compositions in the surrounding membranes.
Area of Science:
- Orthopedic Surgery
- Biomaterials Science
- Immunology
Background:
- Aseptic loosening of acetabular components is a major cause of total hip replacement failure.
- The underlying mechanisms of loosening for cemented versus cementless fixation are not fully understood.
Purpose of the Study:
- To investigate differences in cellular and cytokine profiles of interface membranes from failed cemented and cementless acetabular components.
- To elucidate the pathogenesis of aseptic loosening in total hip arthroplasty.
Main Methods:
- Histology and immunohistochemistry were performed on interface membranes from 5 failed cemented and 5 failed cementless acetabular components.
- Monoclonal antibodies targeted macrophages, fibroblasts, T lymphocytes, and cytokines (IL-1beta, IL-6, TNF-alpha).
Main Results:
- Both cemented and cementless groups showed positive staining for all evaluated cell types and cytokines.
- Macrophages predominated, with ubiquitous staining for IL-1beta and TNF-alpha in both groups.
- Cementless components exhibited more fibroblastic connective tissue compared to cemented components.
Conclusions:
- Periprosthetic membranes from failed cemented and cementless implants contain inflammatory cytokines (IL-1beta, TNF-alpha) that likely contribute to osteolysis and loosening.
- Despite cellular differences, the presence of these inflammatory mediators suggests a shared pathway in aseptic loosening for both fixation types.