Table 2.
Operative treatments, complications and events.
| SPS | Had Revision Surgery (n=74)* |
No Revision Surgery (n=343) |
p-value† |
|---|---|---|---|
| Procedure | 0.84 | ||
| Decompression only | 63 (89%) | 294 (88%) | |
| Non-instrumented fusion | 3 (4%) | 19 (6%) | |
| Instrumented fusion | 5 (7%) | 20 (6%) | |
| Multi-level fusion | 2 (3%) | 15 (4%) | 0.74 |
| Decompression level | |||
| L2–L3 | 28 (39%) | 121 (36%) | 0.73 |
| L3–L4 | 52 (72%) | 234 (69%) | 0.74 |
| L4–L5 | 66 (92%) | 313 (93%) | 0.91 |
| L5-S1 | 26 (36%) | 131 (39%) | 0.76 |
| Levels decompressed | 0.71 | ||
| 0 | 2 (3%) | 6 (2%) | |
| 1 | 14 (19%) | 80 (23%) | |
| 2 | 26 (35%) | 103 (30%) | |
| 3+ | 32 (43%) | 154 (45%) | |
| Operation time, minutes (SD) | 123.6 (63.4) | 130.1 (66.4) | 0.45 |
| Blood loss, cc (SD) | 253.2 (263) | 323.5 (426.1) | 0.18 |
| Blood Replacement | |||
| Intraoperative replacement | 6 (8%) | 34 (10%) | 0.82 |
| Post-operative transfusion | 4 (6%) | 17 (5%) | 0.92 |
| Length of hospital stay, dsys (SD) | 2.7 (1.9) | 3.3 (2.5) | 0.058 |
| Intraoperative complications§ | |||
| Dural tear/ spinal fluid leak | 4 (5%) | 34 (10%) | 0.33 |
| Other | 0 (0%) | 4 (1%) | 0.79 |
| None | 69 (95%) | 304 (89%) | 0.22 |
| Postoperative complications/events¶ | |||
| Wound hematoma | 1 (1%) | 3 (1%) | 0.79 |
| Wound infection | 3 (4%) | 6 (2%) | 0.41 |
| Other | 0 (0%) | 24 (7%) | 0.041 |
| None | 65 (90%) | 294 (86%) | 0.49 |
Surgical information was available for 74 revision surgery patients and 343 no revision surgery patients. Specific procedure information was available on 71 revision surgery and 333 no revision surgery patients.
None of the following were reported: aspiration, nerve root injury, operation at wrong level, vascular injury.
Any reported complications up to 8 weeks post operation. None of the following were reported: bone graft complication, CSF leak, nerve root injury, paralysis, cauda equina injury, wound dehiscence, pseudarthrosis.
The association of operative treatments, complications and events with revision surgery was investigated via chi-square tests for categorical variables and a t-test for continuous variables.