Surgery All of the following are true regarding ankylosing spondylitis except: March 2010 A Involvement of sacroiliac joint B Most of people are HLAB27 positive C 50% of patients may have urinary infection D Bamboo spine may be a radiological feature 💡 Explanation All of the following are true regarding ankylosing spondylitis except: March 2010 ✓ Correct Answer: C. 50% of patients may have urinary infection