Fig. 3From: The clinical relevance of the presence of bridging syndesmophytes on kyphosis correction and maintenance following pedicle subtraction osteotomy for thoracolumbar kyphotic deformity in ankylosing spondylitis: a comparative cohort studyIllustration of the measurements of osteotomized vertebra angle (OVA) and pedicle subtraction angle (PSA) pre and post operatively (a, b) and rod contouring angle (RCA) (b) Back to article page