Abstract
Introduction: Polyethylene and metal has been the material of choice since the 1960’s.
We are now seeing the third generation of cross-linked polyethylene along with work on alternative hard on hard bearings trying to reduce the generation of wear debris.
Issues have been raised from squeaking to high trace elements and strength characteristics of current materials.
Ideally, the surfaces for articulating bearing surfaces will be made from materials having high strength, high wear, and corrosion resistance, a high resistance to creep, and low frictional moments. This paper will review characteristics of a novel new approach for a bearing material.
Methods: A review of past and current materials along with mechanical testing in creating a new approach to the development of a hydrophilic material replacing the polyethylene side of the bearing surface.
Studies have demonstrated the advantages of the fullfluid film layer of lubrication in-terms of enhanced wear performance.
An acetabular “buffer” bearing was developed that features a pliable bearing surface formulated, biocompatible polycarbonate urethane (PCU). A review of design objectives and testing will be highlighted in this paper.
Results: Wear studies have demonstrated performance up to twelve times better compared to polyethylene.
34 components have been implanted reaching two years post-op. Two devices have been removed both for non-related implant issues. Retrieval analysis did not show any appreciable wear or damage to the bearing material.
Conclusions: To date we are encouraged by the early basic and clinical science, however, only additional research and time will demonstrate the long-term viability of this material.
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