The primary goals of minimally invasive spine surgery are to reduce the iatrogenic muscle injury inherent to conventional open spine surgery, hopefully reducing postoperative pain and facilitating return to daily activities. Recently, one of minimally invasive techniques, unilateral biportal endoscopic (UBE) surgery, has been adapted to the cervical, thoracic, and lumbar spine with good results [1–4]. UBE surgery was focused on decompressive technique for lumbar degenerative pathology in the early days but gradually expanded to cervical and thoracic lesions and has been widely adapted to lumbar fusion surgery [3, 5–7].