At age 12, Tom Knapp broke his elbow and was fascinated that surgeons could repair the problem he saw in the X ray. He knew then he wanted to be a doctor, and as he went through his education, settled on orthopedics. Today he is one of the top handful of arthroscopic shoulder surgeons in the L.A. area. He will tell you why goalies have the most shoulder injuries in soccer, and he’ll explain a cutting-edge new surgical technique. After...