In Brief:
The intraobserver and interobserver reproducibility of the EOS stereoradiography system has been evaluated at the cervical spine. The 95% confidence interval of the variability in the measurements of position was 0.84 mm, 1.42 mm, 0.58 mm, 2.53°, 2.34°, and 3.24° in Tx, Ty, Tz, Rx, Ry, and Rz in a local screw-frame.