The injury happened during "Mama, I'm a Big Girl Now" and Winokur continued for several scenes before bowing out. Understudy Katy Grenfell jumped into the show during the reprise of "The Nicest Kids in Town," a spokesman told Playbill On-Line. She's expected to also play the Jan. 30 performance while the extent of Winokur's injury is determined. Winokur was able to tape a segment for "Live With Regis and Kelly" Jan. 30 (her non-dancing performance of "Good Morning, Baltimore" will air Jan. 31) and is being seen by a doctor. Unless the injury is considered more seriously than initially thought, Winokur is expected back in the show shortly at the Neil Simon Theatre, ready to prove "You Can't Stop the Beat."

Understudy Katy Grenfell has played the lead role before in Winokur's absence, but this is the first time she jumped into it in mid-show.

The injury was technically listed as a pull of the medial gastroc, a spokesman said.