Sandra Purdy (IMAGE) University of Leeds Caption Sandra Purdy, who lives with ankylosing spondylitis, a type of arthritis in which the spine and other areas of the body become inflamed. Credit Sandra Purdy Usage Restrictions Please credit Sandra Purdy License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.