Comparison of hinge side fractures between laminoplasty groups.
| Hinge Fracture Type | MP Group (107 levels) | LP Group (227 levels) | P Value |
| Ventral cortex fracture | 67 (59.8%) | 57 (25.1%) | <0.01 |
| Dorsal cortex fracture | 9 (8.4%) | - | - |
| Complete fracture | 9 (8.4%) | 57 (25.1%) | <0.01 |
| Hinge side displacement | 0 (0.0%) | 3 (1.3%) | 0.31 |
Note: Data presented as number of levels (%). Boldface indicates statistically significant findings
LP Group, traditional open-door laminoplasty-treated patients; MP Group, haplo-paraspinal-muscle-preserving laminoplasty-treated patients.