| Literature DB >> 16214008 |
Michael V Birman1, Philip C Noble, Michael A Conditt, Steve Li, Kenneth B Mathis.
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.Entities:
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Year: 2005 PMID： 16214008 DOI： 10.1016/j.arth.2005.05.001
Source DB: PubMed Journal: J Arthroplasty ISSN： 0883-5403 Impact factor: 4.757