Joe Nathan undergoes Tommy John surgery

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Joe Nathan headshot.jpgUPDATE: General manager Bill Smith says that Nathan’s reported “significant” UCL tear ended up being a complete tear, reports Kelsie Smith of the St. Paul Pioneer Press.

7:31 pm: The Twins have announced that Joe Nathan’s Tommy John surgery was a success, reports Joe Christensen of the Minneapolis Star-Tribune. Mets (gasp!) team physician Dr. David Altcheck performed the surgery in New York on Friday.

Altcheck removed a tendon from Nathan’s left wrist and inserted it into his right
elbow, repairing his torn ulnar collateral ligament. The 35-year-old right-hander is expected to miss the entirety of the 2010 season, but should be ready to rock for the early part of the 2011 season.

Jon Rauch has the most closing experience among Nathan’s potential in-house replacements, though the club has yet to make a decision on that front. Matt Guerrier, Jesse Crain and even Francisco Liriano have been discussed as alternatives, while Jason Frasor of the Blue Jays and Heath Bell of the Padres are reportedly available via trade.