Table 2 LDH Characteristics of the initial and revision surgery in the recurrent group
Characteristics | Initial surgery | Revision surgery |
|---|---|---|
Operation Level | ||
L3 – L4 | 1 | 1 |
L4 – L5 | 24 | 24 |
L5 – S1 | 6 | 6 |
LDH type | ||
Protrusion | 2 | 2 |
Subligamentous extrusion | 12 | 12 |
Transligamentous extrusion | 17 | 17 |
Sequestration | 0 | 0 |
Interval of Recurrence | ||
< 0.5 year | 25 | |
0.5 – 1 year | 2 | |
> 1 year | 4 | |
Modified Pfirrmann Grading | ||
II | 8 | 6 |
III | 16 | 16 |
IV | 7 | 9 |