For this, joints are engineered with precision. The ends of the bones are covered with a smooth glistening structure called cartilage that helps them withstand the weight of the body and helps provide smooth gliding movement. Lubrication is provided by a special liquid called ' synovial fluid'. This is secreted by the 'synovium' present on the inner aspect of the capsule enclosing the joint. Balance and stability are provided by 'ligaments' and 'muscles' crossing the joint.
Muscles also provide the power to move the joint.
Inflammation is a natural response of the body to any disease or damage. It is an attempt at healing effected by increase in blood circulation. This is accompanied by swelling, redness and pain. The response is usually temporary until the body takes care of the insult. In arthritis however, for some reason, inflammation can become long lasting and can cause continuous pain and even permanent disability.