The Effect Of T1 Slope Angle On The Change Of The Cervical Curvature Change After Posterior Cervical Double Laminoplasty

Objective:Based on the measurements of preoperative T1-slope and postoperatie parameters,explore the change of sagittal balance after posterior cervical double door laminoplasty.Methods:The radiological data were analyzed retrospectively for 48 patients in our hospital from undergoing double-door laminoplasty due to cervical spondylotic myelopathy.Record the preoperative standing T1-Slope and Cobb2-7 angle before operation and at the final follow.Results:The average follow-up period was 14.6(12-18)months.Cobb C2-7 by preoperative patients with(14.43 ±4.24)° reduce to(8.18 ± 3.01)°,preoperative T1 S and cervical Cobb C2-7 size were positively correlated,according to the measured values of T1 S preoperatively,it can be divided into high H1 S and low T1 S group,two groups had no statistical difference between gender and age,between the two groups of preoperative and postoperative Cobb C2-7 are statistical differences,high TIS group of preoperative and postoperative Cobb difference(7.50± 3.99)°,they have Statistical differences? Conclusion:the size between preoperative cervical lordosis and TIS were positively correlated.sagittal balance changes obviously after posterior cervical double door laminoplasty,cervical alignment decreases,and loss of cervical lordosis to varying degrees,is cervical vertebra tilt forward.Among them the extent of the loss of cervical lordosis is related to preoperative TI-Slope and with strong T1 S,cervical posterior vertebral canal expanded into a larger degree of postoperative lordosis loss.But postoperative cervical lordosis with high T1 S patients is still greater than smaller T1 S patients.