This fluid-filled sac acts as a cushion. Without this sac, the bones would be rubbing against each other and the joint would not be able to function. As a result of disease, injury, or overuse, a bursa may become swollen, inflamed, and painful. This condition is called bursitis. Common sites for bursitis are the shoulder, elbow, hip, knee, and big toe.
All bursas are important to function.
Whether there is irritation from a recent injury or built up injury from prolonged or repeated use, pain, swelling, and loss of motion occurs. Avoid using your arms overhead or in awkward positions. Know how to lift safely. Assess each job before doing it to make sure it is within your limits. Protect against repeated motions of joints in work, sports, or exercise.