Table 2.
Reasons and types of reoperations for ACD and control groups
| Reoperation
|
ACD (N=272)
|
Control (N=278)
|
p-value
|
||||
|---|---|---|---|---|---|---|---|
| Reason | Procedure | Procedures | Subjects | Procedures | Subjects | Procedures | Subjects |
| Reherniation | Re-discectomy | 10 (3.7%) | 10 (3.7%) | 37 (13.3%) | 35 (12.6%) | 0.0001* | 0.0003* |
| Fusion | 4 (1.5%) | 4 (1.5%) | 5 (1.8%) | 5 (1.8%) | |||
| Segmental instability | Fusion | 6 (2.2%) | 5 (1.8%) | 7 (2.5%) | 6 (2.2%) | 0.99 | 0.99 |
| Dural tear (not at primary procedure) | Dural tear repair | 1 (0.4%) | 1 (0.4%) | 0 | 0 | 0.49 | 0.49 |
| Hematoma | Decompression | 0 | 0 | 3 (1.1%) | 3 (1.1%) | 0.25 | 0.25 |
| Other | Decompression | 3 (1.1%) | 3 (1.1%) | 2 (0.7%) | 2 (0.7%) | 0.68 | 0.68 |
| Device failure | Removal | 4 (1.5%) | 4 (1.5%) | N/A | N/A | N/A | N/A |
| Infection or wound healing disorder | Wound revision | 0 | 0 | 6 (2.2%) | 3 (1.1%) | 0.03* | 0.25 |
| Total reoperations# | 28 (10.3%) | 27 (9.9%) | 60 (21.6%) | 54 (19.4%) | 0.0003* | 0.0017* | |
Notes: Other=Scar tissue, cyst, residual herniation, fibrosis, unspecified nerve root decompression.
*
Statistically significant by p<0.05.
#
Note that subject reoperation totals differ from the total number of unique patients who underwent reoperation because some patients underwent more than one type of reoperation.
Abbreviations: ACD, annular closure device; N/A, not applicable.