David Aardsma‘s season ending injury turned out to be a torn labrum in his hip:

Seattle’s closer will undergo surgery Monday to repair a torn labrum in his left hip, the real cause of the pain in Aardsma’s side that shut him down in September.

Aardsma is expected to be throwing again a month later and should have no trouble being up to full speed by Opening Day, according to the Mariners.

David turned in another good season for Seattle in 2010. He’s a high walk pitcher who mitigates that problems with high strikeouts. If he should lose the ability to K batters due to the surgery, he might not be as impressive.