The following laboratory tests may be helpful in determining causes of restless legs syndrome (RLS) or identifying conditions that rule it out. 1  Blood glucose tests for diabetes. 2  Tests for kidney problems. 3  In certain cases, tests for thyroid hormone, magnesium, and folate levels.
Osteoarthritis. Osteoarthritis is the most common form of arthritis in the knee. It is a degenerative,wear-and-tear type of arthritis that occurs most often in people 50 years of age and older, but may occur in younger people, too. In osteoarthritis, the cartilage in the knee joint gradually wears away.he most common types of arthritis are osteoarthritis and rheumatoid arthritis, but there are more than 100 different forms. In 2012, more than 51 million people reported that they had been diagnosed with some form of arthritis, according to the National Health Interview Survey.
There are more than one hundred different types of arthritis. Two of the most common types are osteoarthritis, caused by the wear and tear exerted on the joints through a lifetime and rheumatoid arthritis, caused by an autoimmune response in the body. Osteoarthritis is the arthritis associated with getting older.