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  • Title: Cracking and impingement in ultra-high-molecular-weight polyethylene acetabular liners.
    Author: Birman MV, Noble PC, Conditt MA, Li S, Mathis KB.
    Journal: J Arthroplasty; 2005 Oct; 20(7 Suppl 3):87-92. PubMed ID: 16214008.
    Abstract:
    The purpose of this study was to determine the prevalence of crack formation in conventional ultra-high-molecular-weight polyethylene cups and its association with rim impingement, oxidation, and time in situ. One hundred twenty acetabular cups were retrieved during revision total hip arthroplasty. In 40% (48/120) of the retrieved specimens, multiple subsurface cracks of several millimeters in length were revealed by transillumination. In 5 specimens, full thickness cracks led to fragmentation of the liner before revision. Thirty-eight (32%) liners had regions of moderate to severe impingement damage to the rim; cracks were initiated at the site of impingement in all but 1 liner (P < .0001). Cracks commonly occur in conventional ultra-high-molecular-weight polyethylene liners, often after neck impingement and almost always in association with oxidation of the polymer.
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