<qa>  What is the effect of infliximab on physical function, damage to joints andThis is a clinical research study that will determine if there is a reduction in the signs and symptoms such as back pain and stiffness of patients with ankylosing spondylitis with infliximab therapy. This study will also study the safety of infliximab in patients with ankylosing spondylitis. The effect of infliximab on physical function, damage to joints and the quality of life in patients with ankylosing spondylitis will also be studied. Subjects received infusions of either placebo at weeks 0, 2, 6, 12, 18 and 5 mgkg infliximab at weeks 24, 26, 30 and every 6 weeks through week 96, or 5 mgkg infliximab at weeks 1, 2, 6, 12, 18 and every 6 weeks through week 96 