Abstract
Purpose:To determine the changes in cervical sagittal alignment(CSA), measure the incidence of proximal junctional kyphosis(PJK) and identify the correlation between these two parameters following segmental posterior spinal instrumentation and fusion. Mat...
Highlights
Many studies have demonstrated a flattening of the sagittal profile in AIS, including thoracic hypokyphosis associated with flattening or kyphosis of the cervical spine[1,2]
Cervical kyphosis is frequent in AIS, and the change after posterior spinal fusion surgery is limited
The incidence rate of proximal junctional kyphosis is high, there is a significant correlation between cervical sagittal alignment and proximal junctional kyphosis
Summary
Many studies have demonstrated a flattening of the sagittal profile in AIS (adolescents idiopathic scoliosis), including thoracic hypokyphosis associated with flattening or kyphosis of the cervical spine[1,2]. As sagittal imbalance has been recognized as main source of pain, disability, and poor health status outcomes, and recent reports have showed correlations between cervical kyphosis and axial symptoms, and scoliotic patients treated with surgery may have a greater incidence of cervicodorsal pain when compared with normal subjects[3,4]. Thoracic kyphosis is correlated to lumbar lordosis in AIS[7], and recent reports have showed that cervical sagittal alignment(CSA) and thoracic kyphosis is correlated with each other[2,8]. As integral parts of cervico-thoracic segment of global alignment, it is justified to postulate that some correlation between cervical sagittal alignment and PJK exists to make up a globally balanced spine in the sagittal plane
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