I don't think some of you guys are accurately calculating the risk/reward trade-off of amount lengthened, and also, some of you might be providing members of the forum with misleading info....
First off, there should not be this general guideline of safe amount lengthened (unless you are talking very small amount like 4-5 CM), because the doctor should determine the amount for each individual patient. This is simply too serious of a surgery to say to someone you don't know, "you should do 6 or 7 CM max". There are certain factors that should come into play when considering safety, such as: starting height, bone density, and current proportions (for biomechanics). These should be assessed by a physician.
Now with that being said, I think for most people, a surgeon would say that 5 CM is the cutoff for being in the very safe range, with risk of long-tern complications increasing significantly after that.
Once you find YOUR very safe range, as told by a physician, I don't think there is a compelling argument for anyone to go past it...
Yes, additional height is good, yes I understand many of us want to be significantly taller, but if you take.a step back and ponder the risks of life long pain, reduced athletic function, messed up biomechanics, muscle and nerve damage, and even being crippled, is it worth it to go above the very safe range? It's obviously hard to quantify the risk of experiencing serious complications, but I even think a 15% chance is unacceptable.
And finally, except for some rare cases, the idea of anyone considering over 7 CM is absolutely absurd, because there is significant risk for one or more of the above complaints after that point.
Like they always say, "To each his own", but I felt like I had to make this post. Hopefully I was able to make some people seriously ponder the risk side of the equation, which IMO is more important than the reward side.
I would like to generate some other thoughts, but please focus on risk. Let's try to be rational people and put everything into perspective.