Page 92 - Advanced concepts in orbital wall fractures

Chapter 5
to compare the first position with the last position. The independent samples t test was used to compare all first positions. Probabilities of p<0.05 were considered significant.
Results
Intrasurgeon and intersurgeon repeatability
The intrasurgeon and intersurgeon repeatability are shown in Table 1, the improvement in the position of the implants in Table 2, and the satisfactory compared with unsatisfactory position of the implants in Table 3.
Number of CT scans until satisfied
A mean of 1.6 CT scans was necessary until the surgeon was satisfied with the reconstruction and the maximum for one reconstruction was three. In half of the reconstructions the surgeon was satisfied with the implant position after the first attempt, and in the other half the alterations to the implant position were made based on the CT scan. In just under half of the cases a second or third CT scan was required.
Table 1 Intersurgeon and intrasurgeon repeatability (ICC + 95 % CI).
Intraoperative imaging
Intrasurgeon
Translation 0.88 (0.57-0.97) Pitch 0.77 (0.27-0.94) Yaw 0.64 (0.01-0.90) Roll 0.68 (0.08-0.92)
Intersurgeon
0.74 (0.44-0.89) 0.78 (0.51-0.91) 0.56 (0.16-0.81) 0.34 (-0.13-0.68)
Table 2 First scanned position compared with last scanned position.
Mean
Translation 3.61 mm Pitch 2.52° Yaw 12.38° Roll 6.93°
First
SD
1.36 mm 1.64° 10.98° 4.25°
Mean
2.91 mm 3.74° 8.20° 3.05°
Last
SD
p value
1.02 mm 0.16 2.91° 0.20 7.85° 0.04 2.22° 0.03
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