Addition of instrumented fusion to laminoplasty cannot suppress postoperative sagittal balance exacerbation

- Addition of instrumented posterior fusion to laminoplasty prevented postoperative progression of kyphosis.
- Both laminoplasty and laminoplasty + fusion patients showed exacerbation of cervical sagittal balance.
- Decrease of cervical lordosis resulted in exacerbation of cervical sagittal balance in laminoplasty patients.
- Increase of cervical tilt resulted in exacerbation of cervical sagittal balance in laminoplasty + fusion patients.