Mark KotsayNow I understand why the Boston Red Sox signed Brad Wilkerson.

Alex Speier of WEEI is reporting that Mark Kotsay underwent back surgery on January 29th (my birthday).

Red Sox first baseman/outfielder Mark Kotsay underwent surgery on January 29 for a displaced disc fragment in his back in response to back pain. (Kotsay’s signing became official on January 15, after he had undergone a physical.) Few details for his recovery timetable are available as of yet, but a Red Sox official did say that Kotsay is not expected to miss much of the regular season

Kotsay has had back troubles in the past. The good news is he shouldn’t miss much of the regular season. The bad news is that you don’t know how he’ll be afterward.

Update 3:30 PM: Amalie Benjamin of the Boston Globe is reporting that Kotsay will be out until at least May.