Do you get all the cm lenghtened on femurs?

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Hey guys,
Giotikas told me that sometimes, because of the femurs not being straight, you can "lose" like 1 mm per cm. For example, a 6 cm lenghtening would equal to 5.4 real cm. I have seen some guys experiencing this, while others do get the full amount. Has anyone measured precisely in order to detect how must you "lose"? I want to get 5 real cm, so I think I will do 5.5, but I'm still worried about it.

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Femurs are slightly curver so yes, it is almost impossible tonget the full amoung lengthened.
Giotikas is right.

For your situation, better do close 6cm to be sure. It is a relatively safe amount after all.

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Let’s say femur is 10% degrees tilted from normal (tibia), cos(10) * 5 =4.92

From my calculations there should be almost no lose.Maybe I am wrong..

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Quote from: Dionysus on April 08, 2021, 02:51:48 PMLet’s say femur is 10% degrees tilted from normal (tibia), cos(10) * 5 =4.92

From my calculations there should be almost no lose.Maybe I am wrong..

Yeah, that's why I ask for "empirical" evidence from people who do get measure. Some seem to lose a bit, and others don't. It's weird. Since I do Precise, I wont be able to measure properly during lenghtening. I think I will do it lying on the floor before surgery, and then again when I'm at 5.5. If there is a 5 cm difference, that's it for me.

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Don’t worry you can measure your height during lengthening.You will be on walker if you are doing precise with bigger nails.I am on walker now.

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Quote from: V21 on April 08, 2021, 03:40:01 PMYeah, that's why I ask for "empirical" evidence from people who do get measure. Some seem to lose a bit, and others don't. It's weird. Since I do Precise, I wont be able to measure properly during lenghtening. I think I will do it lying on the floor before surgery, and then again when I'm at 5.5. If there is a 5 cm difference, that's it for me.

Honestly, I can say it's very difficult to measure. You have to consider the compression of the spine at different point in the day, any major APT (duck-ass) that you gained during lengthening that you could fix later on, any discrepancies between the limbs, etc.

Additionally, even when measuring the length of the nail on an X-ray there is a margin of error. Unfortunately the tools to measure height during lengthening just aren't accurate enough. I do believe that almost anyone who lengthens will eventually notice their new height as they grow and reach a point where they are happy with the progress they've made on the nail.

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Quote from: Dionysus on April 08, 2021, 03:42:03 PMDon’t worry you can measure your height during lengthening.You will be on walker if you are doing precise with bigger nails.I am on walker now.

Yeah, but one thing is using walker and another to measure properly. I think I would not be able to keep perfect posture for measuring like I do now. In order to avoid problems, I do measure only at night, at my "lowest".

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As Dionysus said, the real gain would be that trig formula.

The real real gain is also  essentially dependent on if your doctor knows how to use the magnification feature on the x-ray and measure accurately and consistently (same distance from x-ray machien to leg, or use a comparison next to leg), then take that figure and apply the trig formula after with whatever angle your doctor said or use eos full leg scan to see the angle

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Quote from: Dionysus on April 08, 2021, 02:51:48 PMLet’s say femur is 10% degrees tilted from normal (tibia), cos(10) * 5 =4.92

From my calculations there should be almost no lose.Maybe I am wrong..

You are right. The lose is minimal, around 0,5%, let’s say 1% to exaggerate. Still irrelevant.

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I asked Paley this in person and he stated that it is virtually 1:1.  If you lengthen 8cm, you will get 8cm in length.  If less, it’s at most a millimeter or two.  The femurs are at an angle but they are straight if you view them from the side.