Joba Chamberlain underwent surgery to repair a dislocated ankle, an injury he suffered while playing with his son. (Mike Carlson / AP)

Filed at noon; updated at 3:33 p.m. with further details

New York Yankees pitcher Joba Chamberlain underwent surgery after suffering an open dislocation of his right ankle, an injury Yankees General Manager Brian Cashman termed “very significant.”

Chamberlain was playing with his 5-year-old son Karter, often the subject of his tweets, at a children’s recreation center in the Tampa area when he was injured Thursday.

Andy Pettitte (left) and Joba Chamberlain. (Kathy Willens / AP)

Chamberlain, a Yankees source told the Daily News, lost so much blood that there was initial concern for his life. He is expected to remain hospitalized for several days, receiving treatment to prevent infection from the open fracture. “Keep him in your prayers,” Cashman said, “because obviously he's facing a lot right now.”

Chamberlain was throwing well after having Tommy John surgery less than a year ago. Now, Cashman is uncertain whether Chamberlain will be able to pitch this season. “I can't tell you a time frame. But obviously it's a significant injury.”

Possibly career-threatening? “I couldn't say. I just couldn't say,” Cashman said. “I'd like to say no. My heart and my gut tells me no, that's not the case. But at the same time, I don't want to spew information that I'm not really in a position to talk about. It's not my area of expertise, far from it, so I don't want to be in a misleading situation. I don't want to make mistakes on either side of it.”