Ultra-marathoner shares his journey with outpatient knee replacement surgery with world-renowned orthopeadic surgeon Dr. Richard Berger.

Glen Wagner was told by several orthopedic surgeons that, after knee-replacement surgery, his running days would be over. Then he found Dr. Berger. Just six weeks after his surgery, Glen was back in the gym lifting weights and cycling. He now has a new goal: become the oldest man to finish an Ironman.