Table 2.

Numbers and percentages of abnormal measurements

Measurement	Periacetabular osteotomy (n = 108)	Control (n = 22)	p value
Lateral center edge angle less than 25°	106 (93%)	0 (0%)	< 0.0001
Acetabular index greater than 10°	108 (100%)	1 (5%)	< 0.0001
Head-neck offset less than 9 mm	81 (75%)	1 (5%)	< 0.0001
Head-neck offset ratio less than 0.17	69 (64%)	2 (9%)	< 0.0001
Aspheric femoral head	78 (72%)	0 (0%)	< 0.0001
Coxa vara (NSA less than 126°)	4 (3.7%)	0 (0%)	< 0.0001
Coxa valga (NSA less than 139°)	48 (44.4%)	5 (23%)	< 0.0001
Tönnis Grade 1 or 2	22 (20.3%)	2 (9%)	0.32
Congruency	102 (94%)	ND

ND = not determined.