Table 2.
Comparison of characteristics between the patients with spinal cord edema due to cervical spondylosis (SCECS) group and the three non-SCECS subgroups [those negative for intramedullary signal intensity (ISI) on MRI; those positive for ISI on only T2-weighted MR images (T2WI); and those positive for ISI on both T1- and T2-weighted MR images (T1 & T2WI)]
| SCECS (n = 17) | Negative ISI (n = 82) | ISI on T2WI (n = 96) | ISI on T1/T2WI (n = 19) | p value | |
|---|---|---|---|---|---|
| Age (years) *1 | *64 (20) | *73 (14) | 67 (14) | 68 (17) | *0.032 |
| Male (%) *2 | 15 (88) | 53 (65) | 67 (70) | 14 (74) | 0.239 |
| BMI (kg/m2) *1 | 25.4 (5.3) | 23.6 (4.4) | 23.6 (5.2) | 26.2 (5) | 0.08 |
| Smoking (%) *2 | 6 (35) | 30 (37) | 36 (38) | 10 (53) | 1 |
| Time from onset to operation (months) *1 | 6 (7) | 21 (50) | 19 (47) | 31 (45) | 0.129 |
| Postoperative follow-up period (months) *1 | 24 (53) | 24 (32) | 37 (44) | 27 (45) | 0.098 |
| Preoperative C2–7 cervical lordosis (°) *1 | 13 (17) | 14.5 (13) | 13 (13) | 5.5 (19) | 0.11 |
| Preoperative C2–7 range of motion (°) *1 | 35 (13) | 36.5 (21) | 36.5 (18) | 42 (21) | 0.51 |
| Preoperative segmental range of motion (°) *1 | 10 (8) | 7 (7) | 8.5 (6) | 7 (6) | 0.323 |
| Diameter of the spinal canal (mm) *1 | 14 (2) | *14 (2) | *14 (1) | 14 (1) | *0.036 |
| Preoperative JOA total score *1 | 10.0 (4.0) | 10.8 (3.0) | 11.0 (3.0) | 11.0 (2.3) | 0.938 |
| Postoperative JOA total score *1 | 13.0 (3.5) | 12.0 (3.0) | 13.0 (4.0) | 12.0 (3.3) | 0.754 |
| JOA recovery rate (%) *1 | 37.5 (28.5) | 25.0 (33.0) | 33.3 (42.2) | 26.8 (41.7) | 0.499 |
| Reoperation (%) *2 | 0 (0) | 7 (8.5) | 3 (3.2) | 0 (0) | 1 |
Data are presented as median (interquartile range) or frequencies (%)
*1 Kruskal–Wallis test and Bonferroni adjustment, *2 Fisher’s exact test
BMI: body mass index; JOA: Japanese Orthopedic Association surgical outcome score