Vitali Klitschko had the largest payday of his life coming up on November 12th against Hasim Rahman. Too bad Vitali Klitschko pulled up lame with a knee sprain. He had to pull out of the fight, and it'll be rescheduled in the future.

The knee is most complex joint in your body. Ligaments, tendons, bone, muscles all work together to support, move and propel your body. A knee is something that boxer relies on to duck out of the way, generate the force for punches and bounce around the ring.

Vitali Klitschko's injury is a knee sprain, which can range for being a small inconvenience to a major ambulatory issue. Vitali's injury is more along the lines of a small inconvenience.

What is a knee sprain? A knee sprain is the sprain of ligaments in the knee. They can become contorted or injured in such a way that causes inflammation or a small tear.