Table 4.

Intra- and inter-rater precision of CT scan and radiographic measurements

	Intra-rater RMS-SD	Inter-rater RMS-SD
	Rater 1	Rater 1 vs. 2	Rater 1 vs. 3	Rater 2 vs. 3
3-D CT
XY	0.48	0.51	0.45	0.61
TCS-A	0.15	0.12	0.14	0.15
TCS-P	0.14	0.17	0.20	0.15
IFD	0.22	0.27	0.20	0.35
IFH	0.94	0.97	0.87	1.08
2-D CT
TCS-A	0.18	0.19	0.19	0.20
TCS-P	0.24	0.25	0.27	0.20
IFD	0.26	0.27	0.31	0.36
Radiograph
TCS	0.48	0.50	0.47	0.51
TFO	0.78	0.76	0.76	1.12
IFH	2.87	2.84	2.59	4.00

RMS-SD root mean square standard deviation, XY vertical distance from plane X to plane Y, TCS-A anterior tibiofibular clear space, TCS-P posterior tibiofibular clear space, TCS tibiofibular clear space, TFO tibiofibular overlap, IFD depth of incisura fibularis, IFH height of incisura fibularis