I don't know if these type of medical "treatments" designed to delay retirement are necessarily worthwhile.
Andrew Bynum looks like his knee can give up on him at any time. Every single fall or something makes you hold your breath. His knees are simply made of glass. And that is one of the reasons why Howard is better. He is never injured and you're not concerned about his knees at all. That's important (Yao, Oden, etc)