Table 3.

Comparison of Conventional CT Versus CBCT Patellar Measurements by Rater

	Rater 1			Rater 2			Rater 3			Average for 3 Raters
	Conv. CT	CBCT	p value	Conv. CT	CBCT	p	Conv. CT	CBCT	p	Conv. CT	CBCT	p value
Congruence Angle (deg)	31.9 ± 13.0	34.1 ± 20.0	0.62	17.2 ± 13.1	24.6 ± 13.2	0.03	20.4 ± 16.8	24.2 ± 19.1	0.50	23.1 ± 15.5	27.7 ± 17.9	0.08
Tilt Angle (deg)	15.6 ± 13.2	16.8 ± 10.8	0.54	16.2 ± 8.0	14.1 ± 9.3	0.41	15.4 ± 9.0	12.7 ± 10.3	0.17	15.7 ± 10.1	14.5 ± 10.1	0.32
TT-TG (mm)	16.5 ± 4.2	9.4 ± 5.1	< .001	15.9 ± 5.7	10.6 ± 5.4	< .001	15.2 ± 4.8	9.8 ± 5.5	< .001	15.9 ± 4.9	9.9 ± 5.3	< .001

Mean ± SD of data derived from conventional (conv. CT) and cone-beam (CBCT) computed tomography, along with relevant p value as by paired t test, for each of the three raters