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The muscles, bursas, tendons, and bones must be healthy and functioning correctly for the body to move normally. Muscles, which contract to produce movement, are connected to the bones by tendons. Bursas are flat sacs containing joint (synovial) fluid. They reduce friction in areas where skin, muscles, tendons, and ligaments rub over bones.
Often, muscles, bursas, and tendons are injured during sports activities (see Sports Injuries: Introduction). Injury, overuse, infection, and occasionally disease can temporarily or permanently damage these structures. Damage can cause pain, limit control over movement, and reduce the normal range of motion.
Last full review/revision April 2008 by Joseph J. Biundo, MD
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