Just like many internal dairy such as Doitforme from 167cm to 175cm, and he uses insole to keep propotion and make himself taller.
7-7.5cm increased in fumer would be totally 9-9.5cm increased with insole for people lower than average height, much more than just doing Lon in tibia within 6.5cm without insole.

But
Acording to

http://www.limblengtheningforum.com/index.php?action=dlattach;topic=643.0;attach=414

Shared by Medium Drink of Water
Even just 7-7.5cm in femur, the mechanical axis change by the surgery may cause arthritis after decades.

So the potential arthritis problem matters.

What's your opinion friends?