Advanced RA in the hips resembles OA, but the joints are narrowed symetrically unlike OA. The hips look like they will almost move right right into the middle of the pelvis. This condition is called protrusio acetabulae.
Rheumatoid Arthritis is a disease of the immune system. The joint becomes inflamed feeling hot, swollen and painful. After time, stiffness and deformity occur. The cause of Rheumatoid Arthritis is unknown, but is thought to be an allergic reaction against one’s own body’s defense. It causes degeneration of the joint as well, resulting in pain and disability of the joint.
RA starts in the synovium and eventually destroys the joint cartilage. The bone next to the cartilage is also damaged and becomes very soft. RA affects many joints at one time and also affects internal organs.
There are blood tests for rheumatoid arthritis, but they are often not very accurate. Test results for older people over 70 often show positive for the rheumatoid factor, but often the people don’t have rheumatoid arthritis. The test, by itself, is often not very reliable.
Additional References about Arthritis: