Table 2.

Radiographic data of the patient series

Parameter	Preoperative	Postoperative†	Latest followup‡	p value, overall	p value, pre- versus postoperative	p value, preoperative versus followup	p value, postoperative versus followup
Head sphericity (%)	72 (64–81)	86 (74–95)*	85 (73–96)*	< 0.001	0.003	0.004	0.286
Extrusion index (%)	47 (25–60)	21 (12–36)*	20 (3–58)*	0.001	0.003	0.006	0.328
Lateral center-edge angle (°)	1 (–10 to 16)	20 (–2 to 35)*	26 (4–40)*	0.002	0.004	0.004	0.091
Shenton’s line (% intact)	64	82	100	0.087
Acetabular index (°)	17 (6–37)	12 (1–39)	7 (–7 to 19)	0.078
Centrum-collum-diaphyseal angle (°)	133 (127–144)	132 (117–145)	139 (112–169)	0.081
Axial alpha angle (°)	40 (28–48)	42 (29–52)	42 (31–54)	0.482

Continuous parameters are expressed as mean with range in parentheses; *significant difference compared with preoperative; ^†after femoral head reduction osteotomy in all cases and concomitant acetabular containment surgery in five of 11 hips; ^‡after subsequent containment surgery (acetabular and/or intertrochanteric osteotomies) in five of 11 hips.