"He thought he was Evel Knievel for about five minutes and broke half his body," Jack joked on "The Sharon Osbourne Show" Thursday. Jack Osbourne has taken over Sharon's hosting duties while his mom is at his father's bedside.
Jack Osbourne reported the former Black Sabbath frontman broke six ribs, his collar bone and a vertebra in his neck, punctured a lung and underwent an operation on an artery in his arm injured by the collar bone in an ATV crash earlier this week.
Jack Osbourne added that although Ozzy is not in "too good shape" right now, his prognosis is good.
"He's on a lot of morphine, so I think he's kind of happy," Jack Osbourne quipped.
In another report, Osbourne's doctors at Wexham Park Hospital in Slough, South England, where he is being treated, say the singer may not regain his voice, according to WTEV in Jacksonville, Fla.
Medical director Dr. Dick Jack said: "He is not physically able to come off the ventilator yet. While he has got a tube in his throat he can't talk but, while awake, he has been making progress with people. His progress will be slow."
When asked if Osbourne will be able to speak once the tube has been removed, Jack responded, "We don't know."
Jack Osbourne, the co-star of MTV's hit reality series "The Osbournes" also said his mom is holding up, although she, like the rest of the family, was initially shocked.
"They're so damn co-dependent on each other," he said. "One can't live without the other."
Celebrity Couples of 2014 [PHOTOS]