Are left-handed baseball pitchers more prone to injury?

Mon Jun 28, 2010 6:38pm EDT
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NEW YORK (Reuters Life!) - Left-handed baseball pitchers may be more susceptible to injury, according to a U.S. study of college pitchers that found differences in the throwing motions of left and right-handed players.

Researchers from the Center for Sport & Motion Analysis at Texas Metroplex Institute for Sports Performance found the mechanics of a left-handed pitcher resulted in more stress on the bone that runs from the shoulder to the elbow called the humerus.

"It's kind of remarkable to me," researcher Dr. Sherry Werner told Reuters Health. "I never would have expected significant differences."

Werner and her colleagues analyzed the pitching motions of 84 collegiate baseball players, looking at the rotation of their pitching and non-pitching arms, the angles of their elbows and shoulders during the pitching motion, and their arm speed.

They then took the 28 left-handed players in the study and matched them up with 28 right-handers of similar age, height, weight, and throwing speed to examine these details of their motions.

By comparing angle and speed measurements, the researchers found that left-handed pitchers put more stress on their humerus than right-handed pitchers.

"Their range of motion is different to begin with," Werner said, explaining that these mechanical differences could impact the stress on the arm bones. But in terms of significant differences, "the number one thing was torque on the humerus."

This stress is highest, she explained, at the point in the pitching motion where the pitcher has the ball behind him with his arm extended, before the arm accelerates toward the plate. Too much stress on this bone, and it can fracture.

Werner said in the history of Major League Baseball, only four pitchers have had this specific type of injury and all were left-handed.   Continued...