The maximum length of up to 8 cms is a legal advertisement, so when a surgeon tells you that, he is not lying nor telling you the truth. this is like when you going to a shopping mall and you see an offer of discounts up to 80%, it is not mean that all customers can benefit the 80% discount of all the products, it is just mean you might get 40% 50% 60 % or theatrically you might get up to 80% for some products (cases ) but this not applies for all the customers or all of them ends up with 80% discounts.
it is the same scenario that happens after your legs cuts
.
Mostly you won't benefit from the 80% discounts or the 8 cms lengthening, and officially surgeon does not promise you especially that you could reach 8 cms, the advertisement claim that you could reach up to 8 cms safely, otherwise you will not reach it for your safety. I just realize this with my case after my femur breaking and I end up with 4 cms only due to poor bone healing, and when I reviewed my surgeon cases, he never reaches 8 cms in any single case, so guys you have to put this into account.
If a claimed 8 cms lengthening does not exceed the safe limit ( 20% the original bone length, it would ruin your proportions.