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. 2009 Aug 1;80(4):402–412. doi: 10.3109/17453670903161124

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Copyright: © Nordic Orthopedic Federation

This is an open-access article distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the source is credited.

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Figure 6. — A graphical representation of the relationship between year of operation (1987–2002) and the log revision rate ratio with aseptic loosening as endpoint for all prostheses (a), Charnley prostheses (b), and all prostheses excluding Charnley (c). The graphs show 95% confidence intervals, together with results of a linear trend test and a test of non-linearity in the effect of year of operation. The graph is calibrated with the log revision rate ratio set to zero at the mean year of operation. The horizontal line shows the reference level.