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The causes and lesion distributions of study patients [n (%)]
| Causes | Lesion distributions | ||
|---|---|---|---|
| Upper thoracic | Middle thoracic | Lower thoracic | |
| Ossification of the ligamentum flavum 123 | 17 (13.8) | 25 (20.3) | 81 (65.9) |
| Ossification of the posterior longitudinal ligament 73 | 29 (39.7) | 20 (27.3) | 24 (33.0) |
| Intervertebral disc herniation 54 | 4 (7.4) | 50 (92.6) | |
| Diffuse idiopathic skeletal hyperostosis 19 | 3 (15.7) | 7 (36.8) | 9 (47.5) |
| Posterior marginal intraosseous cartilaginous node 14 | 4 (28.5) | 10 (71.5) | |
