Bono "can't move" for several more weeks but is on the mend after his bike accident in New York, his U2 bandmate The Edge has said.
The Irish singer suffered multiple fractures and had to undergo surgery on his "shattered" left elbow after the cycling mishap in Central Park last month, but is expected to make a full recovery.
Guitarist The Edge has now opened up on KROQ's Kevin And Bean Show, saying: "He managed to come out of it with what you could only describe as injuries from a car crash, literally, multiple fractures of bones in his elbow and in his back. But he's doing OK.
"We're kind of lucky he was wearing a helmet so he didn't actually break Central Park.
"But he's made of tough stuff and he's bouncing back."
The Edge revealed Bono has been told to stay as still as possible to help his back heal.
"He's back in Dublin right now and basically he can't move for the next couple of months," he said.
"The most vulnerable was actually his upper back, the scapula because they couldn't put any plates in there or they decided not to do surgery. So he has got to be very still and not move around 'til that's really healed," he said.
U2 have recently announced a string of UK and world tour dates.
The band will play four concerts at London's O2 Arena and two at Glasgow's SSE Hydro late next year. They also said they were preparing performances in their home city of Dublin in Ireland which are yet to be finalised.
The Innocence + Experience tour will begin in Canada in May and move through the US before heading to Europe.