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[lovinglonglegs]

i remember femur is not upright that the lengthening amount is not 100% going to your height, and i heard there's a formula to calculate this for your final height expectation. Does anyone know about that estimator?

[NailedLegs]

Take a look at the video HJ did



tldr;

It doesn't generally matter, the difference will only be about .2cm - .4cm if you lengthen 8cm total. Don't worry about it.

[junior006]

http://www.limblengtheningforum.com/index.php?topic=83664.msg262428#msg262428

[lovinglonglegs]

thanks men

[Body Builder]

The difference is about 10%. For instance you lose about 0,8cm for 8cm lengthening.

[lovinglonglegs]

The difference is about 10%. For instance you lose about 0,8cm for 8cm lengthening.

you sure? i searched and most say it's only less than 0.5cm

[jerrytheman]

when you stand up straight optimally and recovered from duck ass and stuff then 0. Think about it, when someone is 6 feet when they are optimally straight  and legs straight when measuring, they're not actually 6 feet when their legs are shoulder length apart, but they're still a 6 feet person. so who cares. You are exactly 8cm taller if that is what you lengthen.

[JON SNOW]

average femur length is around 46 cm and the angle between the anatomical and mechanical axis or Q-angle, is 13-15 degrees in males

So:      {(y + x)(cos(14))}-{(y)(cos(14))}= ¨actual femur lengthening¨ or  anatomical axis length gain

where  y=femur initial length (cm)
          x=Limb Lengthening (cm)


           {(46cm + 8 cm)(cos(14))}-{(46cm)(cos(14))}=¨actual femur lengthening¨ = 7.76 cm   

           or   -.24  of less of actual height gain

PD:This would be on avg

[JON SNOW]

about 0.1 cm is gained with the osteotomy

and maybe a little more depending on the technique of the surgeon when inserting the nail

So the actual lengthening and height gain are a very close