Abstract
Pseudotumours (soft-tissue masses relating to the hip joint) following metal-on-metal hip resurfacing arthroplasty (MoMHRA) have been associated with elevated serum and hip aspirate metal ion levels, suggesting that pseudotumours occur when there is increased wear. We aimed to quantify in vivo wear of implants revised for pseudotumours (8) and a control group of implants (22) revised for other reasons of failure.
In comparison with the non-pseudotumour implant group, the pseudotumour implant group was associated with: (1) significantly higher median linear wear rate of the femoral component: 8.1 mm/year (range 2.75–25.4 mm/year) vs. 1.79 mm/year (range 0.82–4.15 mm/year), p = 0.002; and (2) significantly higher median linear wear rate of the acetabular component: 7.36 mm/year (range 1.61–24.9 mm/year) vs. 1.28 mm/year (range 0.18–3.33 mm/year), p = 0.001. Wear on the acetabular cup components in the pseudotumour group always involved the edge, indicating edge-loading of the bearing.
This study provides the first direct evidence that pseudotumour is associated with increased wear at the MoM articulation. Furthermore, edge-loading with the loss of fluid film lubrication may be an important wear generation mechanism in patients with pseudotumour.
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Kwon, YM., Gill, H.S., Murray, D.W., Kamali, A. (2011). Retrieval Wear Analysis of Metal-on-Metal Hip Resurfacing Implants Revised Due to Pseudotumours. In: Knahr, K. (eds) Tribology in Total Hip Arthroplasty. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-19429-0_11
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