<prompt> Which is not involved in Ankylosing spondylitis :Knee AnkleSacroiliac jointWrist elbowSpine  <response>: Ans. is c ie Wrist elbow Ankylosing spondylitis also ka Marie-Strumpell ds is a chronic ds characterized by progressive inflammatory stiffening of the joints with a predilection for the joints of axial skeleton. MC involved joint - Sacro iliac joint , next is spine Also Remember Sex ratio : MF 10:1 Age gp : young 15-30 yr X-ray appearance Bamboo spine Squaring of vertebrae Ankylosing spondylitis is a very imp topic and a good look at it will definitely help you. 