Medically reviewed by David Ozeri, MD Bursitis is the inflammation of a bursa, which is a fluid-filled sac between the muscles, tendons, skin, and bones near your joints. Over 150 bursae in your body ...

elbow, and finger joints are all examples of hinge joints. Hinge joints are protected by cartilage and synovial fluid, a gel that assists with lubricating motion in the body. This type of joint is ...