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Table 2 Phantom Accuracy

From: Sternal instability measured with radiostereometric analysis. A study of method feasibility, accuracy and precision

Phantom Position / Axes

X axis (sternal separation)

Mean (SD)

Y axis (proximal-distal translation)

Mean (SD)

Z axis (anterior-posterior translation)

Mean (SD)

Neutral

 Separation 0–1 mm

0.52 (0.35)

−0.11 (0.16)

−0.53 (0.52)

 Separation 1–2 mm

1.05 (0.1)

−0.36 (0.14)

0.04 (0.12)

 Separation 2–3 mm

1.06 (0.13)

−0.41 (0.15)

−0.29 (0.22)

Mean neutral

0.88 (0.25)

0.29(0.13)

−0.26 (0.23)

15° Cranial tilt

 Separation 0–1 mm

0.54 (0.34)

−0.03 (0.16)

−0.65 (0.32)

 Separation 1–2 mm

1.09 (0.08)

−0.35 (0.07)

−0.06 (0.18)

 Separation 2–3 mm

1.05 (0.1)

−0.35 (0.23)

−0.44 (0.77)

Mean 15° cranial tilt

0.89 (0.25)

−0.24 (0.15)

−0.38 (0.24)

15° Caudal tilt

 Separation 0–1 mm

0.52 (0.31)

0.19 (0.15)

−0.46 (0.43)

 Separation 1–2 mm

1.04 (0.07)

0.37 (0.12)

−0.01 (0.16)

 Separation 2–3 mm

1.03 (0.11)

0.44 (0.07)

−0.17 (0.37)

Mean 15° caudal tilt

0.86 (0.24)

0.33 (0.11)

−0.21 (0.19)

  1. The measured difference in means with standard deviations of an approximated 1 mm x-axis phantom migration on the custom made jig. N = 4