Performances of the show Jan. 30-Feb. 2 were played by understudies. Winokur, who plays lead Tracy Turnblad, is being evaluated day by day, a spokesman told Playbill On Line. She's been seen wearing a support on her leg.

Winokur, who is thought to be Tony nomination-bound as Lead Actress (Musical) pulled a calf muscle during Act One Jan. 29, halting the show briefly. 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.

Grenfell played the rest of the Wednesday night show and also played Thursday Jan. 30. Shoshana Bean (one of two covers for Tracy) played Jan. 31.

Winokur may very well return to the show this week to prove the musical's anthem that "You Can't Stop the Beat."

* Winokur was able to tape a segment for "Live With Regis and Kelly" Jan. 30 (her non-dancing performance of "Good Morning, Baltimore" aired the morning of Jan. 31) and is under a doctor's care.

Understudy Katy Grenfell has played the lead role before in Winokur's absence, but Jan. 29 was 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.