Comparison of surgical parameters between laminoplasty groups.
| Surgical Parameters | MP Group | LP Group | P Value |
| Time of surgery, min | 50.5 ± 12.8 | 74.0 ± 17.8 | 0.01 |
| Blood loss volume, mL | 92.5 ± 49.3 | 189.4 ± 62.7 | <0.01 |
| Spinal canal expansion, mm | 3.9 ± 1.3 | 4.2 ± 1.2 | 0.35 |
| CSF leakagea | 0 | 1 | 0.68 |
Note: Spinal cord expansion was measured and compared using preoperative and postoperative computed tomography. Data expressed as mean ± SD. Boldface indicates statistically significant findings.
↵a The CSF leakage here represents leakage that was found during the surgery.
CSF, cerebrospinal fluid; LP Group, traditional open-door laminoplasty-treated patients; MP Group, haplo-paraspinal-muscle-preserving laminoplasty-treated patients.