why limit lengthening cm when you can lengthen with on&off

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say, using precice, i think one can lengthen either femur or tibia to the full 8cm in one go with pausing&resuming if his soft tissues or bone not catching up.

but in practice he's just told to end lengthening at all. how and why this happens?

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Theoretically yes. Lengthening 8cm for tibia and femur is physically possible. But medically no. Should you lengthen a total of 16cm in one go with quadrilateral lengthening, maxing out the nail? Probably not, lol

There is a reason why responsible doctors like Dr.donghoon lee and Dr.Paley have sequence programs that allows patients to lengthen 4 cm on tibia and femur for a total of 8cm, then after a year rebreak and lengthen for another 8 cm.