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Serial head penetration plots for THAs with XLPE liners including those that had reoperations (green) and those that did not (blue) versus the CPE liners that had reoperations (magenta) and those that did not (orange) illustrate the reduced wear associated with the XLPE liners. The THAs with CPE liners that underwent reoperations tended to have the highest wear rates. Penetration measurements for individual THAs are connected by continuous lines.
