Forty-five thousand runners will be pounding the pavement during the LaSalle Bank Chicago Marathon on October 12. Training for the 26.2-mile-run can put a tremendous amount of stress on the body, especially the knees. In fact, statistics show that about one-third of injured runners struggle with knee pain. But a new complimentary guide introduced by the Neurologic & Orthopedic Hospital (NOHC) of Chicago can help reduce the risk of knee injuries.