In March of 1973, a revival of Irene starring Debbie Reynolds was the first show to play the new Minskoff Theatre. Soon many dancers complained of bad backs and all sorts of aches and pains that numbered far more than usual and the choreography by Peter Gennero was not that strenuous.
The stage floor had not been properly installed and there was no give to it.
Rather hastily Irene was sent to St Louis to play a week at the Municipal Opera (and gross an astronomical amount) while the stage floor was torn up and relaid.
[Shows routinely played the St Louis Muni Opera, usually just one current show a season. They would pack it up, load out the sets, fly out, play the week, and return to rehang and resume performances in New York. With 12,000 seats, even at lower prices and out of town expenses and load in/out salaries, the shows would make a killing. Usually 2-3 times the amount possible in New York. Because shows are now technically far more complicated, this practice has fallen by the wayside.]
"If my life weren't funny, it would just be true. And that would be unacceptable."
--Carrie Fisher