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[Scanning electron microscopy studies of morphologic changes in ultra-high molecular weight polyethylene materials
J Jerosch1, S Fuchs, T Schmidt
1Klinik und Poliklinik für Allgemeine Orthopädie, Westfälische Wilhelms-Universität Münster.
Biomedizinische Technik. Biomedical Engineering
|May 1, 1996
Summary
Scanning electron microscopy revealed surface irregularities and cracks in machined ultra-high molecular weight polyethylene (UHMWPE) orthopaedic implants. Direct compression molding and oxygen-eliminated sterilization are recommended for improved UHMWPE quality.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Orthopaedic Surgery
Background:
- Ultra-high molecular weight polyethylene (UHMWPE) is a common bearing material for orthopaedic implants.
- Machining processes can introduce surface defects into UHMWPE components.
- Gamma sterilization, a common method for UHMWPE implants, may induce material degradation.
Purpose of the Study:
- To evaluate the surface and subsurface quality of machined UHMWPE orthopaedic implants using scanning electron microscopy (SEM).
- To assess the impact of gamma sterilization on the integrity of UHMWPE implants.
Main Methods:
- SEM analysis of both non-sterilized and gamma-sterilized machined UHMWPE implants.
- Examination of surface topography and cross-sections to identify irregularities and defects.
Main Results:
- Machined UHMWPE implants exhibited significant surface irregularities.
- Subsurface examination revealed deeper layer irregularities in the polyethylene.
- Gamma-sterilized implants showed cracks (10-30 microns) at depths of 1.5-2.5 mm and occasional crater-like defects.
Conclusions:
- Direct compression molding is a potential method to improve UHMWPE quality.
- Sterilization processes that eliminate oxygen can enhance the integrity of UHMWPE implants.
- Optimizing manufacturing and sterilization is crucial for durable orthopaedic implants.