Table 3 Measurements of slip percentage and Slip angle via N-U, F-E and N-sMR methods

Slip percentage (%)

 sitting

24.1 ± 6.3

19.6 ± 5.7

0.002^*

 upright

18.1 ± 3.4

17.4 ± 3.7

0.39

 flexion

19.3 ± 4.3

18.9 ± 4.8

0.70

 extension

11.7 ± 3.9

11.9 ± 4.1

0.83

 Supine MRI

10.3 ± 3.2

11.4 ± 3.8

0.17

 Sagittal translation in N-U (%)

5.9 ± 2.3

2.1 ± 0.9

 < 0.001^*

 Sagittal translation in F-E (%)

7.5 ± 1.7

6.9 ± 2.1

0.16

 Sagittal translation in N-sMR (%)

13.7 ± 4.3

8.1 ± 3.7

 < 0.001^*

Slip angle (°)

 sitting

-5.2 ± 3.7

-1.3 ± 4.9

 < 0.001^*

 upright

3.7 ± 2.8

8.4 ± 4.3

 < 0.001^*

 flexion

-1.9 ± 5.4

1.6 ± 2.4

 < 0.001^*

 extension

4.8 ± 3.1

9.3 ± 4.5

 < 0.001^*

 Supine MRI

2.3 ± 1.9

7.9 ± 3.7

 < 0.001^*

 Sagittal angulation in N-U (°)

8.9 ± 2.8

9.7 ± 3.1

0.24

 Sagittal angulation in F-E (°)

6.7 ± 2.6

7.7 ± 3.4

0.14

 Sagittal angulation in N-sMR (°)

7.5 ± 2.3

9.3 ± 3.5

0.007^*