Table 1.

Precision of radiostereometric analysis for assessment of stem migration

Axis	Translation (mm)*	Rotation (°)*
Transverse (x)	0.23	0.46
Longitudinal (y)	0.18	1.14
Sagittal (z)	0.30	0.24

*Precision of measurements based on 75 double investigations. Given number represents the smallest migration value that is considered significant and is based on 2 standard deviations of the error obtained. This, hence, represents the 95% confidence limit