Table 7.
Frequencies of instrumentation surgery
| Disease | No. of cases frequency (%) | ||
|---|---|---|---|
| 2011 | 2001 | 1994 | |
| Cervical disc herniation | 197 (30.2) | 450 (10.3) | – (10) |
| Lumbar disc herniation | 470 (6.5) | ||
| Thoracic OPLL | 22 (48.9) | – | – |
| Thoracic OLF | 51 (22.3) | – | – |
| Thoracic OPLL + OLF | 13 (59.1) | – | – |
| Lumbar spondylolysis, isthmic spondylolisthesis | 428 (77.4) | – | – |
| Lumbar degenerative spondylolisthesis | 2,124 (67.9) | – | – |
| Lumbar spinal stenosis | 3,594 (30.9) | – | – |
| Lumbar OPLL | 19 (51.4) | – | – |
| Lumbar OLF | 27 (17.1) | – | – |
| Lumbar OPLL + OLF | 13 (59.1) | – | – |
| Tumor | |||
| Primary benign | 111 (16.5) | 66 (44.9) | – (40) |
| Primary malignant | 27 (32.9) | ||
| Metastatic | 254 (65.3) | 236 (73.8) | – (81) |
| Intramedullary | 1 (1.3) | – | – |
| Inflammation | |||
| Pyogenic | 99 (19.0) | 68 (23.3) | – (20) |
| RA | 181 (75.4) | 224 (84.8) | – (85) |
| Tuberculous | 25 (45.5) | 33 (47.8) | – (37) |
| Fungal | 1 (16.7) | – | – |
| Seronegative arthritisa | 3 (60.0) | – | – |
| AS | 8 (72.7) | – | – |
| Dialysis | 53 (52.5) | – | – |
| Others | 13 (27.1) | – | – |
| Spinal deformity | |||
| Scoliosis | 1,100 (74.1) | 289 (88.4) | – (92) |
| Kyphosis | 430 (80.1) | 48 (80.0) | – (74) |
| Combined | 137 (81.1) | – | – |
| Others | 49 (40.8) | – | – |
OPLL ossification of posterior longitudinal ligament, OLF ossification of ligamentum flavum, RA rheumatoid arthritis, AS ankylosing spondylitis
aExcluding AS