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The histologic features of the interfacial membrane of intramedullary nails
J H Boss1, J Behar, I Misselevich
1Department of Pathology, Bnai-Zion Medical Center, Haifa, Israel.
Abstract:
Thirty-six interfacial membranes collected at the time of removal of intramedullary L316 stainless steel nails were studied histologically. The membranes consisted of bland fibrous tissue in a minority of cases. Most often, the nails were enclosed within a synovial-like membrane. Palisading macrophages and fibroblasts abutted on the metallic surface of the nails. Foreign body giant-celled granulomas were scattered in the midzone of the membranes, mono- and polykaryonic macrophages having phagocytozed small metallic particles, necrotic bony debris, and, sometimes, lipidic compounds. Aggregates of hemosiderin-containing macrophages occasionally marked the sites of previous hemorrhages. When present in the retrieved specimen, the bone underlying the membrane was undergoing remodeling. Interfacial motion, consequent on dissimilar stiffness of the bone and nail, as well as deposition of metallic and bony debris, are likely responsible for the formation of the synovial-like interfacial membrane.
Insights
Histological study of interfacial membranes from intramedullary L316 stainless steel nails reveals synovial-like tissue formation. Macrophages phagocytose metallic particles and debris, indicating a foreign body response to nail implantation.
Area of Science:
- Orthopedic Surgery
- Biomaterials Science
- Histopathology
Background:
- Intramedullary nails are commonly used orthopedic implants.
- Understanding the biological response to these implants is crucial for patient outcomes.
Purpose of the Study:
- To histologically characterize interfacial membranes formed around L316 stainless steel intramedullary nails.
- To investigate the cellular and material components within these membranes.
Main Methods:
- Histological examination of 36 interfacial membranes collected during nail removal.
- Identification of cellular infiltrates, tissue types, and phagocytosed material.
Main Results:
- Most membranes exhibited a synovial-like structure with macrophages and fibroblasts adjacent to the nail surface.
- Foreign body giant cells containing metallic particles, bone debris, and lipids were observed.
- Hemosiderin deposits indicated prior hemorrhages, and underlying bone showed signs of remodeling.
Conclusions:
- Synovial-like interfacial membrane formation is a common response to L316 stainless steel intramedullary nails.
- Interfacial motion and debris deposition likely drive membrane formation.
- The findings provide insights into the biological interactions between metallic implants and bone tissue.