Why do people advise not doing over 5cm?

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Ah thanks for the explanation, you mean that the pins add on some extra lengthening or something?

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That Lost is called subsidence, Birkholtz explained that we dont know why subsidence happens, if you are considering external tibia you should overlengthen like 1.5 cm more, In the process the fixator lengthens 10-15 per cent less than the amount on paper, after when doctor removes the fixators lose .5 cm more.

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Any given and specific figure is a weak guide line and certainly not universal. I prefer to use percentages of bone length to calculate lengthening. Somebody with a 26 inch inseam will be able to 'safely' lengthen a different amount than someone who has a 36 inch inseam.

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As you will pay tons of money, you should go for 7 cm( I hope a very smart guy doesnt appear writing: gor for 100 inches in the femurs), 7 cm are really like 6-6.4 cm, so no ,you wont have very long femurs if you go for 7.