In the human body, there are more than 230 semi-movable and movable joints. Osteoarthritis is the most common joint disorder. It is characterized by affected joints being difficult to move, swollen and warm. Any joint can be affected by this disorder.
Temporomandibular joint disorder, or TMJ, is another joint condition that is relatively common. It affects the jaw and can be caused by a number of factors, such as habitual fingernail biting or gum chewing, trauma to the jaw, certain occupational tasks, teeth grinding, certain dental problems and stress.
A joint dislocation is characterized by two bones separating where they meet at the joint. A dislocation may also cause damage to nerves, ligaments and blood vessels because of no longer being in the normal position. A dislocation is a medical emergency. Trauma is the typical cause of a dislocation, such as a fall, blow or other form of trauma. A sudden impact to a joint can cause this injury.