Table 3.

Comparison of cup version measurements in 15 paired CT and cross-table lateral radiographs

Patient	Cup version (degrees)
	Cross-table	CT	Difference
1	51.2	31	20.2
2	33.6	20	13.6
3	45.3	28	17.3
4	32.5	30	2.5
5	53.4	28	25.4
6	29	9	20
7	52.6	44	8.6
8	3.8	−13	16.8
9	5	0	5.0
10	34	27	7.0
11	21.5	20	1.5
12	8.3	19	−10.7
13	41.4	39	2.4
14	14	15	1.0
15	30.6	29	1.6

All angles are presented with the convention that positive values indicate anteversion and negative values indicate retroversion.