"About five weeks ago she was running around the neighborhood as she does and just didn't see a pothole and rolled her ankle and got a small break in her ankle," he said. "And so she's been relegated to the boot for the last handful of weeks and is still sort of getting through it."
"Her spirits have been amazing, I gotta say," he added. "She's been handling it way better than I would've."
During an interview with ET, Urban further discussed Kidman's attitude following her injury, even praising her for attending his recent show at a drive-in theater that he put on for healthcare workers.
"She is a trouper, because there she was last night out there amongst all the folks, huddling around with her boot and her mask on," Urban said.
While speaking with The Project, Urban said "the hardest thing" about quarantining in Nashville with Kidman and their daughters -- Sunday, 11, and Faith, 9 -- was not knowing when they'd be able to return to Australia.
"We want to get back to see our moms, too," he said. "Nic's sister's there and all of her family, my brother and his family, everybody's there, so we're really anxious to get back."