Deformity

Cobb angle

Surgery

Psychiatry

Myelopathy

Receiver operating characteristic

Radiology

Range of motion

Spinal cord

Cervical vertebrae

Lordosis

Internal medicine

Sagittal plane

Laminoplasty

Orthodontics

Medicine

Radiography

Nuclear medicine

Journal of Neurosurgery Spine

Kyphotic deformity resulting from the loss of cervical lordosis (CL) is a rare but serious complication after cervical laminoplasty (CLP), and it is essential to recognize the risk factors. Previous studies have demonstrated that a greater flexion range of motion (fROM) and smaller extension ROM (eROM) in the cervical spine are associated with the loss of CL after CLP. Considering these facts together, one can hypothesize that an indicator representing the gap between fROM and eROM (gROM) is highly useful in predicting postoperative CL loss. In the present study, the authors aimed to investigate the risk factors of marked CL loss after CLP for cervical spondylotic myelopathy (CSM), including the gROM as a potential predictor.

Gap between flexion and extension ranges of motion: a novel indicator to predict the loss of cervical lordosis after laminoplasty in patients with cervical spondylotic myelopathy