Picture the knee joint as a crowded intersection in a busy city, with people and cars moving through it: up and down, from side to side. When this junction is flowing smoothly, traffic is a breeze and it is easy to get to where you need to be. But when there is an accident or stalled vehicle anywhere linked to the crossing, your route is derailed.
"The knee doesn't work in isolation," says Marissa Schaeffer, a physical therapist at Alvin Ailey American Dance Theater in New York City. "It is constantly affected by forces above and below."
Photo courtesy of Schaeffer<p>A more honest and efficient turnout may be less than 180 degrees.<span></span></p>