Since January, when her rep announced Mariska Hargitay had suffered a partially collapsed lung, information about the nature of the Law & Order: SVU's star condition has been scant, until now.

During a dinner in Manhattan for the American Ballet Theater on Monday, Hargitay, 45, told PEOPLE: "I've been doing my own stunts on the show for 10 years. I fell wrong, basically. I collapsed my lung doing a stunt."

Hargitay underwent surgery in January, then returned to work on her NBC series soon after – only to check back into the hospital on March 3, at which time her rep said: "She is undergoing routine tests and expects to be feeling better soon."

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