The arthritis is a degenerative disease of the joints. It is based on the inflammation of a joint. It can start after an injury which did not heal as it should, or after excessive exercises. Also there are many unknown reasons. The risk is, depending of the evolution, that it can immobilize completely the affected part of the body. In some cases, it advances through the whole organism and makes a normal life impossible and can cause a disability of the movement in the whole body.
It can be treated or even recover, if the arthritis is not very advanced, with specialized treatments.