The hand is a complex structure of tiny bones, muscles, ligaments, and tendons which work together to perform tasks. The wrist and elbow are stabilizing joints that support the steady use of the hand and provide attachment points for the muscles that control the hand and wrist. All three of these areas are prone to injury from overuse or trauma. Your hands are constantly in motion and therefore vulnerable to injury. Repetitive motion or overuse injuries such as tendonitis (inflammation of the tendons) are among the most common hand conditions. Your hands can also be affected by normal wear and tear on the joints, resulting in arthritis.