Table 2 Implant survival and grade of acetabular erosion

Implant

Maintain

70 (61.4)

Reoperation

44 (38.6)

Acetabular erosion

39 (88.6)

Stem loosening

2 (4.5)

Periprosthetic fracture

2 (4.5)

Instability

1 (2.3)

Weighted kappa (95 % CIs)

Intra-observer

Inter-observer

Grade of acetabular erosion

Grade 0

73 (64.0)

0.781 (0.743 to 0.833)

0.700 (0.656 to 0.762)

Grade 1

24 (21.1)

0.732 (0.683 to 0.797)

0.721 (0.661 to 0.783)

Grade 2

7 (6.2)

0.721 (0.669 to 0.759)

0.714 (0.658 to 0.769)

Grade 3

10 (8.7)

0.783 (0.750 to 0.847)

0.733 (0.685 to 0.801)

Total

114