British actress Angela Lansbury, 79, is due to undergo knee replacement surgery in hospital in Los Angeles.
Actress Lansbury won four Tony awards in 13 years
The actress, best known for the long-running detective series Murder, She Wrote, is expected to take up to two months to recover.
"Her knee is so painful from years of dancing," said Lansbury's 52-year-old daughter Deirdre Battarra.
The surgery had been scheduled for some time, she added, and bore no relation to Lansbury slipping onstage last week.
"She's pretty at ease about it all," said Ms Battara.
Lansbury, who rose to fame on Broadway, tripped over an electrical cord at a 75th birthday concert for composer Stephen Sondheim at the Hollywood Bowl last Friday.
The actress has been nominated for three Academy Awards during her long career, most memorably for her role in the 1962 film, The Manchurian Candidate - a role taken by Meryl Streep in last year's remake.
Mystery series Murder, She Wrote, in which she played crime-solving author Jessica Fletcher, ran from 1984 to 1996, returning for occasional specials until 2003. The actress won four Golden Globe awards for her part, and was nominated for an Emmy 12 times.
Lansbury will shortly be seen in the British children's film Nancy McPhee, opposite Emma Thompson and Colin Firth.