Can Internal method lengthen more amount than external on tibia?

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As I have readed

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Quote from: Medium Drink Of Water on December 02, 2015, 11:45:59 PMNo, they can lengthen the same amount, provided you have an additional surgery to swap out the nails if you're doing internal for really high amounts.

why on femur  internal method  can lengthen  more amount?

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Quote from: Alu on December 04, 2015, 06:43:12 PMBoth internal methods for Tibia and Femur nails can lengthen the same amount. But femur can handle more then 5cm better then tibia; 8cm seems to be a good limit.

you mean both internal and external methods can lengthen the same on both femur and tibia?

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and why femur can handle more amount with internal?