Fig. 1From: Operative strategies for ankylosing spondylitis-related thoracolumbar kyphosis: focus on the cervical stiffness, coronal imbalance and hip involvementType I: TLK-AS with a flexible cervical spine. The HP method was used without consdering the CBVA. Significant improvements with a satisfactory result could be seen comparing the photos and radiographs before operation and 36 months after operationBack to article page