Objective To explore the changes in spinal cord drift angle of the surgical and non-surgical junction area after posterior cervical laminoplasty.Methods The clinical data of 69 patients with cervical ossification of the posterior longitudinal ligament treated with laminoplasty by unilateral exposure channel technique from December 2020 to December 2022 were retrospectively analyzed.The changes of cephalic and caudal spinal cord drift angle at the junction area before and after surgery were measured and compared.At pre-operation,immediately after operation,postoperative 2 months and the final follow-up,the intensity of neck pain was assessed by visual analogue scale(VAS)score,and the neurological status was assessed by cervical spine neck disability index(NDI)and Japanese Orthopaedic Association(JOA)score.Results All the operations were successfully completed and the patients were followed up for 12-36(18.7±5.8)months.The spinal cord drifted backward after the operation,and the cephalic and caudal spinal cord drift angles at the junction area were significantly increased at each follow-up time point,all with a statistical significance(P＜0.05).The VAS score of neck pain was significantly improved at postoperative 2 months and the final follow-up,and the NDI and JOA score were significantly improved at each follow-up time point,all with a statistical significance(P＜0.05).Conclusions After laminoplasty,the spinal cord could drift backwards,and spinal cord drift angle at the junction area could further increase compared to before surgery.If the spinal cord drift angle at the junction area is already large before surgery,it is recommended to extend the surgical segment.
维普
万方数据