Ankylosing Spondylitis (AS)

Your Path

  • Ankylosing Spondylitis (AS)


  • Autoimmune disorder that leads to fusing of vertebral joints

Risk Factors

  • M>F, onset 20s


  • Slow, insidious onset LBP
  • Progressive loss of range of motion, diminished forward flexion as bones fuse
  • Low back pain radiates into buttocks
  • LBP doesn't improve w/rest; morning stiffness; tends to get better w/exercise/use
  • Can have peripheral joint pain
  • Tendon insertion pain
  • Eye pain, redness, and tearing from uveitis

Physical Exam Findings

  • Pain over Sacro-Iliac joints
  • Limited range of motion in spine; limited chest expansion
  • Peripheral joint pain and swelling
  • Enthesiitis→ tendon insertion pain/swelling
  • Eye redness and pain