TABLE 2.
Statistical Analysis of Variables of the Surgical Technique
| Decompressed on IOUS and postoperative MRI/CT myelography | Decompressed on IOUS but not postoperative MRI/CT myelography | Total | P value | |
|---|---|---|---|---|
| Levels of laminectomy (mean/SD) | 3.83 (1.07) | 3.28 (1.28) | 3.74 (1.11) | .21 |
| Average laminectomy width (all levels) (mm) (mean/SD) | 17.12 (1.68) | 17.26 (2.89) | 17.14 (1.88) | .85 |
| Minimum laminectomy width (mm) (mean/SD) | 15.05 (2.73) | 15.99 (4.69) | 15.20 (3.07) | .43 |
| Maximum laminectomy width (mm) (mean/SD) | 18.47 (2.03) | 18.20 (3.08) | 18.43 (2.19) | .74 |
| Rostral-most laminectomy width (mm) (mean/SD) | 16.97 (1.89) | 15.86 (3.99) | 16.80 (2.32) | .22 |
| Caudal-most laminectomy width (mm) (mean/SD) | 15.94 (2.07) | 16.58 (1.95) | 16.04 (2.05) | .43 |
| Posterior fusion with laminectomy, No. (%) | ||||
| Yes | 27 (62.79) | 7 (87.50) | 34 (66.67) | |
| No | 16 (37.21) | 1 (12.50) | 17 (33.33) | .17 |
| IOUS findings led to further laminectomy at the time of surgery, No. (%) | ||||
| Yes | 3 (6.98) | 2 (25.00) | 5 (9.80) | |
| No | 40 (93.02) | 6 (75.00) | 46 (90.20) | .17 |
| Rostral-most level of laminectomy (total and partial) | ||||
| C1 | 1 | 0 | 1 | |
| C2 | 5 | 2 | 7 | |
| C3 | 21 | 3 | 24 | |
| C4 | 9 | 2 | 11 | |
| C5 | 6 | 1 | 7 | |
| C6 | 1 | 0 | 1 | .87 |
| Rostral-most laminectomy was partial or total, No. (%) | ||||
| Partial | 6 (13.95) | 2 (25.00) | 8 (15.69) | |
| Total | 37 (86.05) | 6 (75.00) | 43 (84.31) | .56 |
| Caudal-most level of laminectomy (total and partial) | ||||
| C4 | 1 | 1 | 2 | |
| C5 | 6 | 2 | 8 | |
| C6 | 11 | 2 | 13 | |
| C7 | 20 | 3 | 23 | |
| T1 | 5 | 0 | 5 | .50 |
| Caudal-most laminectomy was partial or total, No. (%) | ||||
| Partial | 19 (44.19) | 3 (37.50) | 22 (43.14) | |
| Total | 24 (55.81) | 5 (62.50) | 29 (56.86) | 1.00 |
| Anterior fusion, No. (%) | ||||
| Yes | 7 (16.28) | 3 (37.50) | 10 (19.61) | |
| No | 36 (83.72) | 5 (62.50) | 41 (80.39) | .18 |
| Anterior fusion, No. (%) | ||||
| ACDF | 5 (11.63) | 2 (25.00) | 7 (13.73) | |
| Corpectomy | 2 (4.65) | 1 (12.5) | 3 (5.88) | |
| None | 36 (83.72) | 5 (62.50) | 41 (80.39) | .2 |
| Anterior fusion was after laminectomy, No. (%) | ||||
| Yes | 4 (9.30) | 0 (0.00) | 4 (7.84) | |
| No | 39 (90.70) | 8 (100.00) | 47 (92.16) | 1.00 |
ACDF, anterior cervical diskectomy and fusion; CT, computed tomography; IOUS, intraoperative ultrasound.
Continuous variables were evaluated using the t-test (2-tailed), and categorical variables were evaluated using Fisher's exact test.