TABLE IV.

Cumulative Incidence Estimates of Acetabular Loosening over Time^*

Reconstruction Type	1 Year	2 Years	5 Years	10 Years
Tantalum	0.0% (0.0% to 8.1%†)	0.0% (0.0% to 8.1%†)	0.0% (0.0% to 8.1%†)	0.0% (0.0% to 8.1%†)
Harrington technique	0.0% (0.0% to 3.8%†)	2.8% (0.7% to 10.7%)	7.1% (2.7% to 18.4%)	9.6% (4.1% to 21.7%)

^*The values are given as the cumulative incidence, with the 95% CI in parentheses.

^†In areas in which there were no failures, the bottom limit of the 95% CI was 0 because there was no variance in the group (i.e., none of the implants were revised and all implants survived).