Wear and tear of the soft tissue called cartilage present between hip joints. When the tissue wears out, it causes friction between the bones. This condition is called osteoarthritis and causes extreme pain and distress.
Sometimes, the body’s immune system starts attacking its own tissue and joints. This causes pain and inflammation and is called rheumatoid arthritis.
There isn’t enough blood supply to the bones and this causes the bone tissues to die. The bones become weak and cause arthritis as a result. This condition is called osteonecrosis.