Table 1.

Descriptive values of A_R and A_N

Segments	AR (°)	AN (°)a	P b
A1	41.64±4.23 (33–54)		0.005
A2	41.92±4.42 (33–57)		0.001
A3	44.25±4.74 (36–58)		< 0.001
A4	46.18±5.00 (37–62)	41.10±4.44 (32–55)	< 0.001
A5	47.97±4.52 (39–66)		< 0.001
A6	48.13±4.63 (38–62)		0.001
A7	46.51±4.09 (37–59)		< 0.001

^aA_N is a measurement that is made from anterior portion of femoral head-neck juction, so there is only one measurement for A_N for all segments.

^bP < 0.001 was considered statistically significant difference. Statistically significant difference was detected between A_R and A_N measurements in all segments except A1.

A_N, alpha angle measurement from axial oblique images; A_R, alpha angle measurement from radial reformat-based images.

Data are presented as mean±standard deviation (range).