Need to do LL, please help with some questions :)

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Hello everyone, I am from Asia, 163.5cm, I want a 8cm, so i consider to do 8cm on femur or 4cm on femur and 4cm on tibia, which one is safer please
Thank you in advance!

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Thanks for your reply Google42, actually i planned to do tibia first for about 4.5, and 3 weeks later to do femur about 4, so i can gain 8.5 in total, i heard that below 5cm is low risk, maybe two two risk is safer then a medium risk? plus do both will make proportion looks better...

But I also think maybe 7.5 on femurs only, but i just want to choose a safer way, cost is not important when compared with safety...