From La Velle E. Neal III at the Star Tribune:

The press release states that Dr. Koco Eaton, `found and repaired partial tears to the right labrum and rotator cuff in Bonser’s shoulder. Bonser is expected to miss six to eight months recovering from the surgery.

I just don't get how you have two MRIs and miss this, but this wasn't just the Twins doctors - the Rays' doctors also looked at the MRI and didn't find anything. Humber, you just made the team, good job.

(Edited and front-paged. - Jon)