Table 4.
Comparison of OPLL cervical spine segmental measurements between the M and the WM groups
| Minimal SAC (mm) |
Maximum occupation ratio (%) |
Minimum axial bone space (mm2) |
Maximum local ROM (°) |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M group | WM group | p-value | M group | WM group | p-value | M group | WM group | p-value | M group | WM group | p-value | |
| C2 | 3.0 ± 0.1 | - | - | 51.8 ± 21.4 | 3.9 | - | 115.2 ± 3.9 | - | - | - | - | - |
| C2/3 | 5.2 ± 1.2 | 7.7 ± 1.9 | 0.024* | 48.2 ± 8.7 | 43.4 ± 9.3 | 0.345 | 195.5 ± 13.6 | 213.8 ± 26.8 | 0.174 | 3.6 ± 4.4 | 3.6 ± 4.0 | 0.896 |
| C3 | 5.3 ± 1.8 | 6.8 ± 2.3 | 0.282 | 32.2 ± 7.6 | 35.3 ± 18.0 | 0.792 | 136.9 ± 19.9 | 187.7 ± 33.1 | 0.015* | - | - | - |
| C3/4 | 4.7 ± 1.1 | 6.5 ± 1.2 | < 0.001* | 58.8 ± 9.6 | 49.5 ± 5.4 | 0.018* | 152.9 ± 31.8 | 171.5 ± 39.4 | 0.112 | 7.2 ± 4.2 | 5.5 ± 3.6 | 0.140 |
| C4 | 5.0 ± 2.3 | 6.8 ± 3.0 | 0.271 | 50.8 ± 14.0 | 43.1 ± 17.5 | 0.326 | 159.0 ± 27.96 | 175.1 ± 70.8 | 0.554 | / | / | / |
| C4/5 | 4.8 ± 1.5 | 5.3 ± 0.7 | 0.444 | 55.2 ± 14.2 | 49.8 ± 8.4 | 0.399 | 139.4 ± 32.7 | 189.5 ± 26.7 | 0.007* | 7.2 ± 3.8 | 9.4 ± 4.9 | 0.126 |
| C5 | 6.2 ± 2.5 | 4.6 ± 0.7 | 0.411 | 39.9 ± 16.0 | 37.8 ± 11.4 | 0.816 | 179.8 ± 43.2 | 140.8 ± 0.6 | 0.235 | - | - | - |
| C5/6 | 5.4 ± 1.3 | 5.8 ± 1.6 | 0.503 | 53.2 ± 13.4 | 48.0 ± 4.6 | 0.464 | 150.2 ± 30.2 | 167.0 ± 21.8 | 0.180 | 6.0 ± 3.9 | 9.1 ± 4.7 | 0.015* |
| C6 | 6.5 ± 1.6 | 7.6 ± 2.6 | 0.564 | 45.5 ± 17.8 | 42.2 ± 31.5 | 0.829 | 170.8 ± 33.5 | 227.4 ± 75.3 | 0.266 | - | - | - |
| C6/7 | 6.4 ± 2.7 | - | - | 55.3 ± 16.0 | - | - | 154.0 ± 49.7 | - | - | 4.2 ± 4.4 | - | - |
| C7 | 7.8 | 6.5 | - | 45.6 ± 6.0 | 37.1 ± 11.9 | 0.078 | 169.1 | 115.2 | - | - | - | - |
Values are presented as mean±standard deviation.
OPLL, ossification of the posterior longitudinal ligament; M group, myelopathy group; WM group, without myelopathy group; SAC, space available for the spinal cord; ROM, range of motion.
*
p < 0.05, statistically significant differences.