Degree of syndesmophyte involvement in 11 thoracic and lumbar vertebral levels.
| Percentage of Patients with Any Syndesmophytes* | Mean (SD) Circumferential Height | Percentage of Patients with Any Bridging* | Mean (SD) Extent of Bridging | |
|---|---|---|---|---|
| T5–T6 | 65 (11/17) | 15.1 (23.5) | 53 (9/17) | 72.3 (166.0) |
| T6–T7 | 69 (11/16) | 9.1 (13.6) | 50 (8/16) | 39.7 (68.7) |
| T7–T8 | 81 (13/16) | 13.6 (18.8) | 50 (8/16) | 60.6 (96.2) |
| T8–T9 | 62 (10/16) | 10.2 (15.1) | 50 (8/16) | 44.1 (73.0) |
| T9–T10 | 69 (11/16) | 8.4 (9.4) | 50 (8/16) | 33.1 (41.1) |
| T10–T11 | 65 (11/17) | 10.6 (16.3) | 47 (8/17) | 39.1 (78.0) |
| T11–T12 | 83 (15/18) | 13.4 (19.9) | 33 (6/18) | 49.7 (98.3) |
| T12–L1 | 89 (16/18) | 10.7 (13.3) | 39 (7/18) | 31.4 (60.8) |
| L1–L2 | 72 (13/18) | 6.9 (7.6) | 11 (2/18) | 4.7 (14.0) |
| L2–L3 | 67 (12/18) | 9.7 (14.0) | 33 (6/18) | 29.4 (56.7) |
| L3–L4 | 56 (10/18) | 5.5 (9.1) | 17 (3/18) | 5.5 (14.3) |
| Ptrend | 0.69 | 0.08 | 0.0001 | 0.02 |
↵* Some vertebral levels had fewer than 18 values because a few IDS could not be processed by the CT algorithm due to extensive discitis (Andersson lesions). CT: computed tomography; IDS: intervertebral disc spaces.