In group B, the increase of cervical tilt significantly positively correlated with both the increase of T1 tilt ( p < 0.001) and the increase of apical vertebral translation of proximal thoracic curve ( p < 0.05). In group A, the decrease of cervical tilt significantly positively correlated with that of T1 tilt ( p < 0.001). However, the cervical tilt significantly improved in group A ( p < 0.001) but deteriorated in group B ( p < 0.001). Most (83.3%) of the patients in these two groups gained satisfactory shoulder balance after surgery. Both standing anteroposterior and sagittal X-ray films of the spine obtained preoperatively, one week after the operation, and at a minimum of two-year follow-up were analyzed with respect to the following parameters: cervical tilt, T1 tilt, proximal thoracic Cobb angle, main thoracic Cobb angle, apical vertebral translation of proximal thoracic curve, apical vertebral translation of main thoracic curve, radiographic shoulder height, cervical lordosis, proximal thoracic kyphosis and main thoracic kyphosis. There were 14 cases proximally fused to T1 or T2 (Group A) and 16 cases proximally fused to T3 or below (Group B). All the subjects were divided into 2 groups according to the selection of upper instrumented vertebra. MethodsĪ total of 30 Lenke type 2 AIS patients with preoperative right-elevated shoulder underwent posterior spinal instrumentation from 2009 to 2011 were included in this study. The purpose of this study is to evaluate the cervical tilt in Lenke type 2 adolescent idiopathic scoliosis patients with right-elevated shoulder treated by either full fusion or partial/non fusion of the proximal thoracic curve.
To date, no study had reported the phenomenon of deteriorated postoperative cervical tilt in Lenke type 2 adolescent idiopathic scoliosis patients.