Osteoarthritis

1-Osteoarthritis affects facet joints and sacro-iliac joints.

2-Anatomically, the joint space is formed from articular surface and joint space.

3-There are three changes occur in the joint space and other three changes occur in articular surface in case of osteoarthritis.

4-In the articular surface:

-Sub articular sclerosis.

-Sub articular cystic changes.

-Osteophytic lipping.

5-In the joint space:

-Narrowing.

-Vacuum phenomena.

-Disc calcification.