It was nearly 50 years ago that legendary Dr. Frank Jobe pioneered the procedure of replacing a damaged ulnar collateral ligament in the pitching elbow by grafting a tendon from the wrist of the other arm.

Source: https://www.latimes.com/sports/dodgers/story/2023-12-14/shohei-ohtani-dodgers-tommy-john-surgery-neal-elattrache

Kinley pitched extremely well last season, posting a 0.75 ERA in 25 games, before undergoing surgery to repair the ulnar collateral ligament in his right elbow.

Source: https://www.dailycamera.com/2023/03/04/rockies-sign-brad-hand-lucas-gilbreath-injury/

Ohtani will not make his scheduled start against the Mets this week because of a torn ulnar collateral ligament.

Source: https://www.bostonherald.com/2023/08/25/shohei-ohtani-angels-take-down-kodai-senga-mets-in-series-opener/

Pitcher Antonio Senzatela was placed on the 15-day injured list on Friday due to an ulnar collateral ligament sprain in his right elbow.

Source: https://www.denverpost.com/2023/05/13/rockies-ryan-feltner-line-drive-head-phillies-loss/