Table 1

Comparison of patient demographics by laminoplasty group.

DemographicsMP GroupLP Group P Value
Number2246
Age61.2 ± 6.460.9 ± 5.90.85
Gender (male:female)(14:8)(29:17)0.96
BMI26.6 ± 3.027.7 ± 2.70.08
Disc herniation (patients)1939
OPLL (patients)820
Operation level0.74
 C3–C648
 C3–C71629
 C2–C614
 C2–C715
Preoperative JOA9.1 ± 7.98.7 ± 7.20.84
Preoperative VAS5.2 ± 2.55.4 ± 2.30.75
Follow-up period (mo)15.8 ± 3.816.8 ± 3.20.55
  • Note: Data are shown as the mean ± SD; ‘-’ represents values were not compared for differences.

  • BMI, body mass index; JOA, Japanese Orthopaedic Association; LP Group, traditional open-door laminoplasty-treated patients; MP Group, haplo-paraspinal-muscle-preserving laminoplasty-treated patients; OPLL, ossification of posterior longitudinal ligament; VAS, visual analog scale.