Summarized average results of measured parameters of 2 radiologists during neutral and flexion MRI in 45 patients with Hirayama disease
| Minimum | Maximum | Mean | SD | |
|---|---|---|---|---|
| Distance of LDS | 3.00 | 9.80 | 5.9978 | 1.90424 |
| Spinal canal diameter in neutral MRI | 10.80 | 15.30 | 12.7756 | .99457 |
| Spinal canal diameter in flexion MRI | 10.90 | 15.50 | 12.9644 | 1.01604 |
| AP cord diameter at neutral MRI | 3.30 | 7.40 | 5.5378 | 1.00029 |
| TR cord diameter at neutral MRI | 7.50 | 14.40 | 12.1911 | 1.32593 |
| AP cord diameter at flexion MRI | 2.50 | 6.60 | 4.8089 | .96903 |
| TR cord diameter at flexion MRI | 9.20 | 16.20 | 14.1022 | 1.39569 |
| Ratio of LDS/spinal canal diameter in flexion MRI | 0.24 | 0.74 | 0.461 | 0.14 |
| Ratio of AP/TR diameter of cord in flexion MRI | 0.17 | 0.59 | 0.3455 | 0.08634 |
| Ratio of AP/TR diameter of cord in neutral MRI | 0.26 | 0.72 | 0.4587 | 0.09899 |
| Decrement of AP/TR diameter of cord during flexion MRI | 0.03 | 0.26 | 0.118 | 0.06 |
Note:—Measurements are in millimeters.