Did your team just lose it's best pitcher or top prospect to an elbow sprain? What is Tommy John and why do so many pitchers at every level have it? Why did the surgery Dr. Frank Jobe dreamed up in 1974 save baseball and what are the modern variants? Will Carroll explains why elbows break, how surgeons put them back together, and why it's so hard to keep them from breaking. It's an Injury Territory Explainer.

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