What Cracking Your Knuckles Really Is

According to Yahoo answers, when you crack your knuckles you are essentially pushing the joint into or out of its normal position. A think, clear lubricant called synovial fluid is found in the joints between your bones. When you crack your fingers, you cause the bones to pull apart, and the pressure on the synovial fluid is reduced. Bubbles form and quickly expand and then burst http://ask.yahoo.com/20020828.html).