As the protective cartilage is worn away by knee
arthritis, bare bone is exposed within the joint .It is not necessary that if one knee
is affected the other will also be affected.
Mild to moderate knee arthritis can be treated with several different medications, including a few medications that can be injected into the knee joint. The two most common types of injections are Synvisc (also sold under the name Hyalgan) and cortisone.
Both medications have shown some effectiveness in studies.