Osteoarthritis is one of the types of arthritis that is caused due to degeneration and eventually loss of the cartilage of joints. Cartilage is a tissue that covers the inside of the joints and acts as a cushion between the two bones forming a joint. When the cartilage starts undergoing degeneration, the bone becomes inflamed as its protective covering is lost. This causes pain during weight bearing activities such as standing, walking, etc.