The 25-year-old Arredondo, once considered the Angels' future closer, returned home to the Dominican Republic on Friday after spending the week in Southern California. He is expected to return in January to have the surgery.
After posting a 1.62 ERA in 61 innings in 2008 as an integral part of the Angels' bullpen, Arredondo struggled last season in part because of elbow problems. Arredondo had a 6.00 ERA in 45 innings in 2009 and was sent down to Class AAA Salt Lake at one point.
Arredondo's injury may also affect the Angels this offseason. The team may now be reluctant to part with a reliever in a trade and will have to find another right-handed reliever to replace Arredondo.
Jorge Arangure Jr. is a senior writer for ESPN The Magazine.