Study Design: A prospective study. Summary of Background Data: For advanced stages of ankylosing spondylitis (AS), the correction of spine deformities is quite often with pedicle subtraction osteotomy (PSO). We reported a new resected technique of spinal osteotomy, called the vertebral column decancellation (VCD) in 2010 to treat rigid scoliosis and severe sharp angular spinal deformities. We first report comparisons between VCD with PSO. Objective: We performed to compare VCD and PSO in correcting kyphosis deformities related to AS.