Table 3.
Collapse grades and outcomes
| Variable | Collapse grade | p-value | |||
|---|---|---|---|---|---|
| Grade 1 (n=13) | Grade 2 (n=24) | Grade 3 (n=12) | Grade 4 (n=10) | ||
| Surgical approach | 0.124 | ||||
| Decompression | 5 | 6 | 2 | 1 | |
| PLF | 3 | 4 | 1 | 2 | |
| PTLIF | 5 | 6 | 3 | 2 | |
| LIF | 0 | 7 | 4 | 1 | |
| VCR | 0 | 1 | 2 | 4 | |
| JOA score (max=29) | |||||
| Preoperative | 6.9±5.6 | 12.6±5.1 | 11.8±5.2 | 7.9±2.8 | <0.01* |
| Final FU | 17.8±6.1a) | 22.4±5.9a) | 22.1±4.8a) | 21.1±3.9a) | 0.107 |
| Local kyphosis angle (°)b) | |||||
| Preoperative | −0.2±8.4 | −2.1±11.9 | 5.3±12.4 | 8.0±11.6 | 0.065 |
| Immediate postoperative | −3.3±8.1a) | −4.9±11.3a) | −0.1±10.0a) | −1.4±11.6a) | 0.574 |
| Final FU | −0.5±6.6 | −2.5±11.6 | 2.9±9.7 | 4.7±13.3 | 0.251 |
| Fusion length (no. of vertebrae fused) | 1.9±0.7 | 2.5±1.6 | 2.6±2.4 | 2.7±1.2 | 0.596 |
| Intervertebral instability (+) | 8/13 (61.5) | 20/24 (83.3) | 10/12 (83.3) | 10/10 (100.0) | 0.128 |
| Fusion rate | 3/8 (37.5) | 10/18 (55.5) | 6/10 (60.0) | 4/9 (44.4) | 0.571 |
| FU duration (mo) | 25.3±21.9 | 21.2±12.2 | 30.8±23.1 | 24.3±17.9 | 0.527 |
| Revision surgery | 1 (7.6) | 4 (16.6) | 0 | 4 (40.0) | 0.066 |
| Surgical site infection | 1 | 1 | - | 1 | |
| Adjacent vertebra fracture | - | 1 | - | 2 | |
| Post-decompression instability (required fusion) | - | 1 | - | - | |
| Rod breakage | - | - | - | 1 | |
| Pedicle screw loosening | - | 1 | - | - | |
Values are presented as number, mean±standard deviation, or number (%).
PLF, posterior lateral fusion; PTLIF, posterior/transforaminal interbody fusion; LIF, lateral interbody fusion; VCR, vertebral column resection; JOA, Japanese Orthopaedic Association; FU, follow-up.
*
p<0.05.
a)
Indicates p-value <0.01 compared with preoperative data.
b)
Negative value indicates lordosis.