Table 1.
Demographic data of groups M and H.
| Characteristics | Group M (exLAP) | Group H (Conventional) | p-Value |
|---|---|---|---|
| Patients (no.) | 17 | 11 | |
| Age (years) | 70 ± 11 | 71 ± 10 | 0.932 |
| Sex | |||
| Male | 13 | 9 | |
| Female | 4 | 2 | |
| Diagnosis | |||
| CSM | 15 | 7 | |
| OPLL | 2 | 4 | |
| Preoperative lordosis angle (°) | 12 ± 10 | 4 ± 13 | 0.116 |
| Skin incision length (mm) | 34 ± 2 | 84 ± 14 | <0.001 |
| Operative time (min) | 89 ± 17 | 81 ± 31 | 0.360 |
| Intraoperative blood loss (mL) | 37 ± 54 | 62 ± 54 | 0.246 |
Values are presented as means ± standard deviations unless otherwise indicated. Group M underwent exoscopic minimally invasive open-door laminoplasty (exLAP). Group H underwent conventional Hirabayashi open-door laminoplasty. CSM, cervical spondylotic myelopathy; OPLL, ossification of the posterior longitudinal ligament. The lordosis angle was the angle formed by the two tangential lines to the posterior wall of the C2 and C6 vertebrae measured before surgery.