The Impact of Single-Level Anterior Cervical Discectomy and Fusion on Cervical Sagittal Parameters and Its Correlation With Pain and Functional Outcome of Patients With Neck Pain

This study examines the changes in segmental and global cervical sagittal parameters after single-level anterior cervical discectomy and fusion (ACDF) in patients with cervical radiculopathy or myelopathy. We also investigate whether these changes have any relation with postoperative pain and functional outcome of the patients. Sixty patients (37 females and 23 males) with a mean age of 45.9 ± 9.5 years who were candidates of single-level ACDF due to cervical myelopathy or radiculopathy participated in the study. At baseline, 1 month, and 6 months after ACDF, outcomes of the study including sagittal balance parameters, pain intensity, and Neck Disability Index (NDI) were measured among the patients. Intensity of pain and neck disability were measured using the visual analog scale (VAS) and validated version of NDI, respectively. Using a standard lateral cervical radiography, the Cobb angle for occiput-C2, C1-C2, and C2-C7 as well as operation-level angle (OA; Cobb's angle at the level of discopathy), the thoracic inlet angle, and C7 and T1 slope angles were measured. The intensity of pain and neck disability of patients improved significantly during the follow up of the study comparing with baseline measurements ( < .001). There was a significant correlation between the increase of C2-C7 angle, C1-C2 angle, and OA and improvement in neck pain and NDI at 1- and 6-month follow ups. We found that changes at C2-C7 angle, C1-C2 angle, and OA have positive significant correlation with clinical outcome including pain improvement and decrease of disability in patients who undergo ACDF. 3. The results of this study might be beneficial in selection of cervical cages with appropriate size during ACDF surgery, as our findinds showed that larger cages could lead to better functional outcome in patients.