O'Malley (shoulder) underwent arthroscopic surgery Tuesday and remains out for at least several more months, Greg Johns of MLB.com reports.
O'Malley went on the 60-day disabled list in part due to a recent appendectomy, but he's also taken the opportunity to clean up a less-publicized right shoulder problem. The veteran utility man turned in a solid spring (.278/.333/.278 with six RBI, three walks and four stolen bases over 16 games) before being hospitalized on March 21 for the emergency appendix procedure.