When doctors recommend surgery, they are professionals assessing risk. There's always some risk, with a major surgery, of death. A patient could have an adverse reaction to pain killers or anesthesia or contract and infection. Then there's a probability the surgery makes things worse. Surgery could also do nothing. Ideally it makes things better.
The doctor weighs those risks against the benefits, recovery time, lifestyle improvements/needs, etc..
But this is not a minor surgery. They're going to shave down the head of his femur and drill a hole into it so they can insert a metal cap on the end.
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