Marte has torn UCL before trade.

[General]

A source told the Boston Herald another team that was interested in Andy Marte turned away after the Braves acknowledged the player had a tear in the ulnar collateral ligament of an elbow.
A Red Sox official said the team reviewed his medical file and declared him healthy. If Marte has a tear in his UCL, he might someday need Tommy John surgery. It's not as big of a concern for him as it would be for a pitcher, but it could leave the Red Sox without his services for a year.

[ATLien]

Js = Genius

[Saber]

Depending on when the surgery happens, Marte might not even be out a whole year. Considering his age, I don't think this affects him long-term.