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Table 1 Precision of radiostereometric analysis for assessment of stem migration

From: Effect of symmetrical restoration for the migration of uncemented total hip arthroplasty: a randomized RSA study with 75 patients and 5-year follow-up

Axis Translation (mm)* Rotation (°)*
Transverse (x) 0.23 0.46
Longitudinal (y) 0.18 1.14
Sagittal (z) 0.30 0.24
  1. *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