Soria underwent Tommy John surgery by specialist Dr. Lewis Yocum at the Kerlan-Jobe Clinic in Los Angeles. This was the second reconstructive procedure on the closer's right elbow, but the medical team reported no issues because of the prior surgery.
His first surgery was in 2003 by Dr. Frank Jobe, the originator of the procedure in 1974.
In a recent interview with MLB.com's Paul Casella, Dr. Jobe was asked about having the procedure for a second time, not specifically in Soria's case, but in general.
"When you have to have it the second time, you do worry a little bit more, and there's a couple reasons for that. One, you might be someone whose connective tissue is not quite as quality as the other guys who have gotten it just once and it held up. The other thing is, he might have gone back to pitching too soon. You can't be sure, though," Jobe said.
"If you're going to do it a second time, you want to be sure that you're going to get some really good tissue to replace it this time around."
According to a Royals' spokesman, the medical team "couldn't have been more pleased" after Soria's surgery.
Soria, who has compiled 160 saves, 13 wins and a 2.40 ERA in five years with the Royals, will miss at least this season.