// breaking my self-imposed abstinence from this forum to hopefully share something useful
The most meaningful advice I got regarding percentages, centimeters, etc. was from Drs. Paley and Packer. They both said "how much you lengthen depends on how much your body is able to tolerate. We will not lengthen you more than your body can realistically achieve under medically safe parameters." (this takes into account the hard limit of 8cm of the Precise nail, obviously)
I don't know what all the parameters are, but I would suspect they involve loss of flexibility, loss of range of motion, nerve damage, bones not healing, etc.
During my conversation with Dr. Packer, she said some people come in and are absolutely fixated on the full 8 centimeters, and in some cases, some of those people have to make peace with the reality that it will just not happen for them.
So, neither percentages nor centimeters are most important. Safety is most important. You want to come out exactly like you came in health-wise, just taller (and, well, with a few somewhat noticeable scars - not much can be done about that except fading over time, creams, plastic surgery, if it's all that important).
I have a goal, but am not married to that goal. I don't want to do multiple surgeries, and I want as close to a full recovery as possible. It's already awesome that you can grow 3 inches after your growth plates close - even less than that, huge achievement for most people. Go in with safety as the #1 priority, come out healthy and enjoy your new height.
Here are, however, some things that _may_ help get you close to the maximum number:
1) Lots of flexibility. With all the doctors I've consulted, they all cited this as the # 1 success factor in getting the maximum amount of height from the procedure
2) A very regimented and methodical recovery plan, and extra stretching and PT.
- Dr. Packer really stressed this. Everything has to be done on the clock, daily, like the most punctual drill of your life.
3) Obviously, optimal health and lean muscle mass. No smoking, drinking, etc.
- Dr. Guichet is on to something when he says "prepare like an Olympic athlete for this". Bodies that are healthy and strong have much lower risk factors and chances of complication, and will generally recover faster.
- Drs. Paley and Packer reinforced the health part. They both said that in some cases, older patients recover faster than much younger ones due a much more optimal physical condition. Programdude's diary mentioned this several times, from his experience. They went as far as saying that even up to 50 years of age, age is not a factor for patients that are very healthy and in good shape.
Last - Yoga and especially Pilates. I've "grown" a full inch from both. Mind you, this is making the most of height I had but lost due to moderate scoliosis and, despite ridiculous flexibility and athleticism, poor posture and neck alignment. Probably also the case for most people, our posture sucks nowdays. So this gives you back something you probably already had, but 2.2 cms is nothing to laugh at and it's either less that you have to lengthen, or something extra to gain.
I should mention that this is the most I'll gain through Yoga and Pilates. I've straightened and realigned my spine as much as I can without surgery (and it's been close to a full recovery), but aside from not walking around with a stupid hip gait, I'm a bit taller, and that's pretty awesome. They'll also get you flexible if you're not, which will definitely help with the procedure.
Also, there are absolutely tall people that do this surgery. Dr. Paley operated on a 5'11" Dutch patient (he cites this on his website). Of the thousands of people that do this procedure (Precise alone apparently just hit 2,000 nails, with Dr. Paley having inserted 350 of them, there are only a handful of diaries, and the majority are on this site). I won't reveal my height - many have asked - but I cannot be considered short (I also cannot be considered tall, I am not 6'), and I'll have this surgery in less than 3 months.
HTH. Focus on going in as flexible and as healthy as you can, and always keep safety first.
--jbc