Ever wonder why Hunter Pence throws so awkwardly?

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Giants outfielder Hunter Pence has never looked graceful on the baseball field, but we’ve always chalked that up to him just being goofy. There’s actually a legitimate medical reason behind his awkward-looking mechanics, though, as Ken Rosenthal of FOX Sports found out.

Pence, 31, told the FOX broadcasters before Game 1 of the NLCS that he has Scheuermann’€™s Disease, a spinal disorder that he likely developed as an adolescent.

The condition affects the vertebrae, and the way Pence described it, he has no flexibility in his thoracic spine.

“€œThat’€™s why he throws the way he does,”€ Giants head athletic trainer Dave Groeschner said. “€œHe has no rotation in the mid-spine.”

Nevertheless, Pence has consistently rated among the best outfielders in baseball since he broke into the majors in 2007. According to FanGraphs, only five outfielders have been more valuable than Pence (29.2 WAR) since the beginning of the ’07 season: Matt Holliday (42.1), Andrew McCutchen (33.9), Ryan Braun (33.1), Jose Bautista (30.7), and Jayson Werth (29.9).

Pence has reached base in all six of the Giants’ post-season games thus far.