Acetabular components wear performance

Range of Clinical Wear Performance in Cemented Acetabular Components... 

Chamley and coworkers first developed radiographic techniques for evaluating the wear rate of UHMWPE acetabular components in patients. In 1973, Chamley and Cupic reported on the long-term wear performance in the first cohort of patients to receive a UHMWPE component between November 1962 and December 1963. During this time period, 170 patients received a cemented LFA with an UHMWPE component a total of 185 acetabular cups were implanted. Because of the elderly population originally implanted with the components, many had died or were too infirm to travel to the clinic for followup examination (more than two-thirds of the patients were older than 60 years of age at the time of implantation). Thus, only 106 out of the original 185 UHMWPE cups could still be evaluated after 9 or 10 years of implantation. The complications for this series included a 4-6% rate of infection, 1-2% rate of mechanical loosening, and a 2% incidence of late dislocation. 

Martell J., E. Berkson, and J.J. Jacobs. 2000. The performance of 2D vs. 3D computerized wear analysis in the Harris Galante acetabular component. Orthopaedic Transactions 25 564. 

RANGE OF CLINICAL WEAR PERFORMANCE IN CEMENTED ACETABULAR COMPONENTS... 

Qrishimo KF, Hopper RH, Engh CA Long-term in vivo wear performance of pOTous-coated acetabular components sterilized with gamma irradiation in air and ethylene oxide. J Arthroplasty 2003 18 546-52. 

In 1996, Chmell et al. [57] published a retrospective review of 143 patients implanted with Hylamer acetabular inserts after a follow-up period of at least 2 years. The index surgeries were performed between 1991 and 1992, and thus all of the Hylamer components in this study were gamma irradiated in air. Seventeen patients in the series were implanted with matched femoral components from the same manufacturer as the liner the remaining patients were implanted with mismatched femoral components from a different manufacturer. Overall, the revision rate due to excessive wear was 4.8%, with all six of the revisions occurring within the group of 126 patients with mismatched components. The authors judged the wear-related failure rate to be unacceptable and discontinued use of Hylamer acetabular inserts. 

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