Table 3.

Radiographic results for acetabular version in hips with Legg–Calvé–Perthes Disease (LCPD) staged according to Waldenström [24] (55 hips) and compared to the contralateral hip without LCPD (47 hips)

Parameter	Waldenström stage I (41 hips)	Waldenström stage II (54 hips)	Waldenström stage III (52 hips)	Waldenström stage IV (43 hips)	p value global	p value stage I vs. II	p value stage II vs. III	p value stage III vs. IV
Pelvic width index (%)
LCPD	46 ± 4 (37–55)	44 ± 5 (32–56)	44 ± 5 (34–58)	48 ± 5 (36–62)	< 0.001	< 0.001	0.621	< 0.001
Contralateral side without LCPD	51 ± 4 (45–62)	52 ± 4 (45–65)	52 ± 4 (45–63)	51 ± 5 (45–2)	0.709	–	–	–
p value LCPD vs. contralateral	< 0.001	< 0.001	< 0.001	0.002
Ilioischial angle (°)
LCPD	96 ± 4 (90–106)	98 ± 4 (89–110)	97 ± 4 (88–109)	94 ± 4 (84–109)	< 0.001	< 0.001	0.201	< 0.001
Contralateral side without LCPD	92 ± 4 (85–97)	92 ± 4 (84–97)	92 ± 4 (79–97)	92 ± 3 (82–98)	0.342	–	–	–
p value LCPD vs. contralateral	< 0.001	< 0.001	< 0.001	0.009
Prevalence of acetabular retroversion (hips [percentage])
Pelvic width Index (PWI)
LCPD (defined as PWI < 0.44%)	16 (39)	29 (54)	29 (56)	13 (30)	0.038	0.156	0.831	0.013
Contralateral side without LCPD	0	0	0	0	1.000	–	–	–
p value LCPD vs. contralateral	< 0.001	< 0.001	< 0.001	< 0.001
Ilioischial angle (IIA)
LCPD (defined as IIA > 97°)	15 (37)	30 (56)	29 (56)	10 (23)0	0.003	0.067	0.982-	0.001
Contralateral side without LCPD	0	0	0	0	1.000	–	–	–
p value LCPD vs. contralateral	< 0.001	< 0.001	< 0.001	0.001

Continuous parameters are expressed as mean ± standard deviation and range in parenthesis

LCPD Legg-Calvé-Perthes Disease