Dave Meltzer of the Wrestling Observer is reporting that
Dominik Mysterio will be undergoing elbow surgery for an
injury he suffered on the April 15 episode of Raw in his match
against Andrade.

The injury revolves around his ulnar collateral ligament, the
ligament that runs on the inner side of the elbow.

Recovery period for surgery on this ligament takes around nine
months according to the Cleveland Clinic, and on certain
occasions, it takes even more.

It’s often associated with baseball players and it’s also
called a Tommy John surgery, based on the baseball pitcher
Tommy John who in 1974 went for the first procedure