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

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

Variables Classification of LCEA P P
Grade I Grade II Grade III Grade IV
Tönnis osteoarthritis classification      < 0.001c
 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) 0.001a < 0.001b
Labral inversion 1 (1.0) 1 (2.5) 5 (6.6) 8 (14.8) 0.003a < 0.001b
Discontinuity of Shenton line 6 (5.8) 8 (20.0) 29 (38.2) 40 (74.1) < 0.001a < 0.001b
  1. achi-square test or Fisher test, bCochran-Armitage trend test; cSpearman classification correlation parameter 0.387(95%CI, 0.281–0.492)