The term “upper extremities” refers to the hands, wrists, arms, elbows, and shoulders. It covers the area from your fingers to your shoulder joint, including bones, muscles, tendons and nerves. An increasing number of athletes will experience injury due to overuse. These injuries are most likely to occur in sports that require the hand to be repeatedly raised above the head to perform a forceful motion. Sports such as baseball, softball, volleyball, swimming, and tennis are examples of this type of movement.