Table 3.
The cross-sectional area of dural sac and spinal cord on each position.
| Level | CSM patients |
Asymptomatic subjects |
|
|---|---|---|---|
| Flexion (mm2) | Extension (mm2) | Neutral on MRI (mm2) | |
| The cross-sectional area of dural sac | |||
| C2/C3 | 153.5 ± 19.5 | 159.8 ± 22.9 | 208.0 ± 39.2 |
| C3/C4 | 122.1 ± 17.4 | 120.6 ± 18.2 | 170.7 ± 32.1 |
| C4/C5 | 114.2 ± 19.5 | 102.6 ± 19.8 | 164.5 ± 32.7 |
| C5/C6 | 105.4 ± 14.8 | 90.3 ± 15.0 | 152.7 ± 30.8 |
| C6/C7 | 111.6 ± 17.0 | 100.1 ± 18.0 | 153.3 ± 30.7 |
| C7/T1 | 114.0 ± 17.5 | 107.0 ± 18.0 | 160.3 ± 29.7 |
| The cross-sectional area of spinal cord | |||
| C2/C3 | 61.7 ± 7.1 | 60.5 ± 6.9 | 75.7 ± 8.7 |
| C3/C4 | 56.1 ± 6.0 | 53.9 ± 7.1 | 75.0 ± 9.8 |
| C4/C5 | 50.9 ± 7.5 | 46.7 ± 7.4 | 75.5 ± 11.1 |
| C5/C6 | 45.9 ± 7.5 | 40.4 ± 6.5 | 69.8 ± 11.5 |
| C6/C7 | 43.9 ± 6.4 | 41.5 ± 7.4 | 62.4 ± 10.1 |
| C7/T1 | 40.1 ± 5.3 | 38.0 ± 4.9 | 52.3 ± 7.3 |
Values given are mean ± standard deviation (SD) unless otherwise specified.
CSM indicates cervical spondylotic myelopathy.