Osmond talked about her injury during an appearance Monday on CBS' "The Talk."
Osmond. 60, was forced to back out of a performance last Saturday night, but is promising she will be back for this week's final shows.
She and Donny Osmond, who is 62, each have had hits with songs such as "Puppy Love," and "Paper Roses."
Front-row seats for the last concert Saturday were going for $4,000 or more, the Las Vegas Review-Journal reported.
They are from a family of performers that enjoyed huge popularity in the 1970s.
Information from: Las Vegas Review-Journal, http://www.lvrj.com
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