The lateral center-edge angle as radiographic selection criteria for periacetabular osteotomy for developmental dysplasia of the hip in patients aged above 13 years

Table 2 Tönnis osteoarthritis classification, labral lesion, labral inversion and discontinuity of Shenton line stratified by LCEA grades, [n (%)]

Variables	Classification of LCEA				P	P
Variables	Grade I	Grade II	Grade III	Grade IV	P	P
Tönnis osteoarthritis classification					< 0.001^c	–
Grade 0	81 (77.9)	21 (52.5)	31 (40.8)	16 (29.6)
Grade I	18 (17.3)	14 (35.0)	34 (44.7)	25 (46.3)
Grade II	3 (2.9)	3 (7.5)	7 (9.2)	10 (18.5)
Grade III	2 (1.9)	2 (5.0)	4 (5.3)	3 (5.6)
Labral lesion	19 (18.3)	8 (20.0)	28 (36.8)	27 (50.0)	0.001^a	< 0.001^b
Labral inversion	1 (1.0)	1 (2.5)	5 (6.6)	8 (14.8)	0.003^a	< 0.001^b
Discontinuity of Shenton line	6 (5.8)	8 (20.0)	29 (38.2)	40 (74.1)	< 0.001^a	< 0.001^b

^achi-square test or Fisher test, ^bCochran-Armitage trend test; ^cSpearman classification correlation parameter 0.387(95%CI, 0.281–0.492)

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