Agree with the opinions here. Just look at a femur x-ray. It almost is straight. It is negligible angle in terms of height loss
Mister v21, I figure doing 5.1cm is enough. 5.2cm if you're worried. 5.5 is not necessary. The more important part is pushing your doctor to accurately measure and check if they are using the proper magnification function and accurate for x-ray measure
I agree with all of you that, in theory, the difference should be irrelevant. However there are users who have noticed this. Maybe I'm wrong, but I think that SNC did 8 and, when measured, had 7.3. That's why I'm curious if someone has really measured properly. In the past I have measured obsessively, to the milimitre, and always at my lowest, so I think I will be able to check this in an "empirical" way lol
Measuring during the day (referring to entire day, not morning) is so variable. Even using night height is so variable. Waking up at 8am and measuring at 9am will be different from 10am, 1 addittional hour, and measuring at night at 8pm will be different from 12pm, and depends how much of day you stood and walked, layed down for 30 minutes or not, etc
Point is, measuring your stature is not reliable if you want it down to the mm
even the magnification adjusted xray can be wrong and probably not accurate to the millimeter
in the end, i think the only surefire way to measure accuracy to the mm is the max out your nail to 8cm according to erc, then keep running it for extra day or a week despite being 8cm, keep going EVEN while its technically 8cm on erc already, keep going, maxing out the nail will be exactly 80mm.
Or better yet, no need to worry for a few decimals of mm. no one can tell it will just be a personal neurotic thought
Quote from: Serilium on April 08, 2021, 07:09:33 PMMeasuring during the day (referring to entire day, not morning) is so variable. Even using night height is so variable. Waking up at 8am and measuring at 9am will be different from 10am, 1 addittional hour, and measuring at night at 8pm will be different from 12pm, and depends how much of day you stood and walked, layed down for 30 minutes or not, etc
Point is, measuring your stature is not reliable if you want it down to the mm
even the magnification adjusted xray can be wrong and probably not accurate to the millimeter
in the end, i think the only surefire way to measure accuracy to the mm is the max out your nail to 8cm according to erc, then keep running it for extra day or a week despite being 8cm, keep going EVEN while its technically 8cm on erc already, keep going, maxing out the nail will be exactly 80mm.
Or better yet, no need to worry for a few decimals of mm. no one can tell it will just be a personal neurotic thought
This is the truth. No one measures to the mm in height. Most people when asked lie about their height anyways. Usually they add 2-3 cm on top of it. inches are way larger so fluctuation during the day are not so relevant if you state your height in feet.
Even different hair can make up a few mm lol
Quote from: Serilium on April 08, 2021, 07:09:33 PMMeasuring during the day (referring to entire day, not morning) is so variable. Even using night height is so variable. Waking up at 8am and measuring at 9am will be different from 10am, 1 addittional hour, and measuring at night at 8pm will be different from 12pm, and depends how much of day you stood and walked, layed down for 30 minutes or not, etc
Point is, measuring your stature is not reliable if you want it down to the mm
even the magnification adjusted xray can be wrong and probably not accurate to the millimeter
in the end, i think the only surefire way to measure accuracy to the mm is the max out your nail to 8cm according to erc, then keep running it for extra day or a week despite being 8cm, keep going EVEN while its technically 8cm on erc already, keep going, maxing out the nail will be exactly 80mm.
Or better yet, no need to worry for a few decimals of mm. no one can tell it will just be a personal neurotic thought
I do agree. The issue is that I do this for neurotic reasons hahahaha I do can meausure my lowest. When I measure at night I'm 172.1. After measuring like 4-5 times it goes down to 171.7, but never less than that
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..
I just googled cos(10) * 5 cm, it shows result as 4.2 cm approximately. You lose almost 0.8 cm for 5cm of lengthening on femur for an angle of 10 degrees between femur and the mechanical axis. Ofcourse, this loss is highly individual and is greatly affected by the angle mentioned.
Do let me know, if you think if there is an issue with the above calculation.
Quote from: HobbitMan on April 08, 2021, 06:30:11 PMI 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.
Ofcourse the femur bone would look straight from the side view, but from the frontal view its not! Mathematically speaking you would never get 1:1 of the increased length. i.e. If you lengthen 8 cm in femurs, the original height increase will always be less than 8cm.
It would be great to have some practical insights from people who have already done limb lengthening on their femurs.
Big issue. Google on default uses radians instead of degrees. You need cos(10degrees).
Quote from: Serilium on April 08, 2021, 10:23:36 PMBig issue. Google on default uses radians instead of degrees. You need cos(10degrees).
Thanks for the correction, Serilium.
Indeed, cos(10 degrees) * 5 cm =4.92 cm.
The loss is almost 0.08 cm for 5cm of femoral lengthening, which is negligible.
Hi guys
3 weeks ago I reached 4 cm distraction in x ray
My starting height was 176.5 cm. I directly wen to measure and was spot on 180.5 cm
Since then did my x rays again and 5.8 cm lengthened in x ray so technically should have measured at 182.3.
However I measured at 181.5
So I don’t get it how x ray height shows 5.8 cm lengthened but only 5 cm jn real measurement.
Maybe first time I measured it was morning height and now I measured afternoon.
Still boggles me.
Some have advised me poor posture could affect and eventually I will see full height gain
Any comments
Quote from: chasing_higher_dream on April 08, 2021, 09:27:26 PMI just googled cos(10) * 5 cm, it shows result as 4.2 cm approximately. You lose almost 0.8 cm for 5cm of lengthening on femur for an angle of 10 degrees between femur and the mechanical axis. Ofcourse, this loss is highly individual and is greatly affected by the angle mentioned.
Do let me know, if you think if there is an issue with the above calculation.
Ofcourse the femur bone would look straight from the side view, but from the frontal view its not! Mathematically speaking you would never get 1:1 of the increased length. i.e. If you lengthen 8 cm in femurs, the original height increase will always be less than 8cm.
It would be great to have some practical insights from people who have already done limb lengthening on their femurs.
When you googled cos(10), you were not googling cos(10 degrees). Default google unit is radians.
5cm * cos(10 degrees) is 4.92cm.
I think this is why paley told me that you get exactly what you lengthen. Even at his limit of 8cm for femurs that is just over a millimeter “lost” or less than 2% of total length. You probably lose more than that within the first 5 minutes of waking up.
Quote from: Ahd1978 on April 09, 2021, 11:17:43 PMHi guys
3 weeks ago I reached 4 cm distraction in x ray
My starting height was 176.5 cm. I directly wen to measure and was spot on 180.5 cm
Since then did my x rays again and 5.8 cm lengthened in x ray so technically should have measured at 182.3.
However I measured at 181.5
So I don’t get it how x ray height shows 5.8 cm lengthened but only 5 cm jn real measurement.
Maybe first time I measured it was morning height and now I measured afternoon.
Still boggles me.
Some have advised me poor posture could affect and eventually I will see full height gain
Any comments
Honestly unless you measured at the same time of day (hours since bed) and posture with the same measuring method then it’s really hard to say anything other than to go back and make sure you measured at the same time of day and in the same posture and with the same measuring apparatus.
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