Table 2.

Pre- and postoperative radiographic data

Parameter	Preoperative	Postoperative	p value
Lateral center-edge angle (degrees) [49]	30 ± 6 (18–46)	24 ± 7 (10–44)	< 0.001
Acetabular index (degrees) [46]	4 ± 6 (−11 to 17)	7 ± 7 (−6 to 25)	< 0.001
Extrusion index (percent) [28]	21 ± 6 (6–32)	26 ± 6 (8–39)	< 0.001
ACM angle (degrees) [41]	44 ± 4 (38–54)	44 ± 6 (34–56)	0.134
Crossover sign (percent positive) [36]	56	20	< 0.001
Retroversion index [44] (percent, of hips with positive crossover sign [36])	29 ± 13 (6–53)	16 ± 12 (6–48)	0.004
Posterior wall sign (percent positive) [36]	80	87	0.167
Ischial spine sign (percent positive) [17]	46	43	0.386
Caudocranial coverage (percent)	82 ± 7 (66–100)	74 ± 8 (51–91)	< 0.001
Anterior coverage (percent)	24 ± 6 (11–37)	18 ± 6 (8–35)	< 0.001
Posterior coverage (percent)	42 ± 8 (27–64)	41 ± 8 (22–64)	0.226
Axial alpha angle (degrees) [31]	61 ± 11 (37–85)	46 ± 7 (30–76)	< 0.001

Values of continuous parameters are expressed as mean ± SD with range in parentheses.