Bone structure includes: hard bone, there is soft bone "cartilage", there are connective nerves and there are synovial fluids which soften contact with the joints. Osteoarthritis is a damage to the cartilage, caused by hard work, either due to aging or also frequent injuries. The most frequently affected parts of the body are: shoulders, elbows, knees, neck, hands and thumbs. The average age of people with osteoarthritis is between 35 and 50 years old, the bones damaged as a result of this disease do not return to their former shape.