"I tried to stand back up and just collapsed," he said. "I thought, 'Something's not good here.'"
He shook off the pain, finished the show then went to a Manchester hospital where doctors said he broke his foot, twisted his ankle and pulled a muscle.
He took some pain meds then hopped on the bus for the 10-hour ride to Cleveland with his "American Idols Live" tour mates.
Bice said he will back on stage for Tuesday night's Cleveland show sporting an air cast.
Audiences for the rest of tour will get a more-subdued but no less entertaining, version of the long-haired southern rocker, he said.
"I guess people will get a kind of, ahem, stool sample of Bo," he joked.
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