by Jonathan Kennedy, The Conversation An X-ray image comparing a healthy spine and one showing signs of ankylosing spondylitis. Credit: Suttha Burawonk/Shutterstock Ankylosing spondylitis (AS) is the second most common type of inflammatory arthritis, often affecting teenagers and young adults. Symptoms of AS can include back pain, stiffness, joint inflammation (arthritis), inflammation where tendons attach to bones...
