Would it be selfish to ask my husband not to have this surgery?

My husband lives with C5 quadriplegia caused by a spinal cord injury 21 years ago. With the advances in stem cell research there may come a time when he could have surgery to help repair the damage to his spinal cord and help him regain some feeling and maybe even some function below the level of his injury. But with the reward comes risk, risk that the procedure could fail, causing more damage to the spinal cord at a higher level taking away some of what function he currently has. There would also of course be a risk of death. If he wanted to have this surgery and take the risk in order to have the chance to walk again would it be selfish of me to ask him not to because I don’t think the risk is worth it?

This is purely speculation at this point but he and I were having this conversation today and it got me thinking about this question. ...and I got his permission before asking this question.