Rock star Ozzy Osbourne remains in intensive care at a UK hospital after being injured in a quad bike accident.
Osbourne has enjoyed renewed celebrity
Osbourne, 55, was on a ventilator after breaking his collarbone, eight ribs and a vertebra in his neck.
Dr Dick Jack from Wexham Park Hospital in Slough, Berkshire, confirmed that Osbourne had had emergency surgery.
His tour manager, Bill Greer, said at 1600 on Tuesday that the singer was "comfortable and stable" and was likely to remain on a ventilator for 24 hours.
There was no cause for alarm and there was not likely to be any paralysis, Mr Greer said.
Paramedics were called to Osbourne's estate in Chalfont St Peter, Buckinghamshire at 1420 GMT on Monday.
Osbourne's wife and manager, Sharon, arrived in London on Tuesday afternoon and went straight to see her husband at the hospital.
Mr Greer said: "This really is a difficult time for the rest of the family and at this point
Sharon really doesn't feel able to come and talk to you directly.
"She really wanted me to wish thanks to everybody, all the well-wishers for
all the messages, all the flowers, all the words of goodwill to Ozzy."
Dr Jack, the hospital's medical director, said the injuries were "not a major problem".
Osbourne and daughter Kelly have done a duet single
He said the former Black Sabbath singer was "resting" and wearing a hard collar because of his fractured vertebrae.
The star is unable to speak because he has a tube down his throat.
A statement issued by Osbourne's US publicists said he had emergency surgery to "lift the collarbone which is believed to be resting on a major artery interrupting blood flow to his arm".
Surgeons also worked to alleviate some bleeding into his lungs, but the statement added: "These injuries are not considered to be life-threatening."
Osbourne performed for the Queen's Golden Jubilee in 2002
Dr Annabel Bentley, assistant medical director at BUPA, said Osbourne could be helped to breathe for a day or maybe longer, and may be in hospital for at least a week or more.
She said he was on a ventilator because when someone breaks that many ribs and his collar bone it makes it "difficult to breathe".
"They tend to take only shallow breaths because of the pain caused by their injuries," she said.
News of Osbourne's accident reached the House of Commons, where the government sent a goodwill message.
Health Secretary John Reid told MPs that everyone "wished him a speedy recovery" .
Dr Jack added he was unable to say how long Osbourne would stay in hospital.
A spokesman for Two Shires ambulance service said a man had been taken to Wexham Park Hospital in Slough on Monday at 1510 GMT.
Osbourne was given treatment at the scene, before being taken to hospital, the spokesman said.
Tour manager Mr Greer said Osbourne would not now complete a UK promotional tour for his Christmas single, Changes, a duet with daughter Kelly.
Ladbrokes said it had seen "a number of bets this afternoon" on Changes becoming Christmas Number One.
"The single was quoted at 66/1 and not even on the main betting list this morning but after laying a number of significant wagers the odds have been slashed to 20/1 joint third favourite," a Ladbrokes spokesman said.
Osbourne has enjoyed renewed celebrity in Britain and the US because of the MTV reality show based around his family life in Los Angeles.