The ulnar collateral ligament, which connects the humerus bone in the upper arm to the ulna bone in the lower arm, is under attack in major league baseball. A quarter of pitchers have had surgery to reconstruct the ligament, a procedure known as Tommy John surgery. Regardless of his position, age or surgeon, every baseball player who has had the operation carries a defining emblem of the trade.

An enjoyable piece of photojournalism from The New York Times that highlights the need for proper arm care through proper mechanics, long toss, adequate rest, and post-throwing icing, among others.

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