Table 3 Comparison of radiological parameters between patients with grades 0–2 and grade 3 TIDL

 Pre-operative

11.6 (11.5), 8.2, 14.9

14.5 (7.0), 10.3, 18.7

7.5 (15.0), 2.5, 12.5

0.037*

 At surgery

3.5 (8.6), 1.0, 6.0

6.1 (6.8), 3.0, 9.2

−0.2 (9.6), −3.8, 3.5

0.018*

 At follow-up

13.9 (13.1), 10.1, 17.7

13.4 (10.1), 8.4, 18.5

14.6 (16.8), 8.6, 20.5

0.859**

 ΔSKA

10.4 (10.9), 7.2, 13.6

7.3 (6.3), 3.4, 11.3

14.7 (14.4), 10.0, 19.4

0.007**

 Pre-operative

67.2 (16.2), 62.5, 71.9

71.5 (14.8), 65.6, 77.4

61.1 (16.6), 54.1, 68.2

0.032*

 At surgery

90.0 (11.4), 86.6, 93.3

90.9 (10.4), 86.6, 95.3

88.6 (12.8), 83.4, 93.8

0.507*

 At follow-up

80.3, (16.4), 75.5, 85.0

83.4 (16.2), 77.2, 89.5

76.0 (16.1), 68.7, 83.2

0.105**

 ΔAVBHR

9.7 (11.0), 6.5, 12.9

7.6 (11.5), 3.5, 11.7

12.7 (9.7), 7.8, 17.5

0.018**

Residual endplate deformity, n

4

17

< 0.001^a