Osteoarthritis , which is also called as Wear and tear is the progressive diseases of the joints.During the Osteo arthritis, the articular cartilage which covers the ends of the bones in the joints may gradually wears away.
The Joint is where the ends of two or more bones are meet.The knee joint is formed between the bones of the lower leg and the thighbone.The hip joint is where the top of the thighbone will meets the concave portion of the pelvis. A healthy joint may easily glides without the pain because, the smooth,elastic tissue which is called ad articular cartilage may covers the ends of the bones that may make up the joint.