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This article was updated on February 26, 2018, because of a previous error. On pages 1 and 7, in the author byline section, the authors' names that had read “Andrew Harris” and “Brett Owens” now reads “Andrew P. Harris” and “Brett D. Owens.”An erratum has been published: JBJS Reviews. 2018 Feb;6(2):e7.The anterior cord of the ulnar collateral ligament is the portion most commonly injured and is what is reconstructed.The ulnar collateral ligament is under the most stress during the late cocking and early acceleration phases of throwing.Magnetic resonance imaging is necessary to properly diagnose ulnar collateral ligament insufficiency.Reconstruction is the primary treatment method for athletes. The modified Jobe and Docking techniques are the most commonly used operative techniques.Athletes are able to return to competition, on average, between 12 and 20 months after the procedure with typically excellent outcomes.