1) depends on flexibility, most can after recovery and effort yes
2) 8cm or 3.15inch is a typical goal for femur
5cm or 2inch is typical goal for tibia
3) yes, but it is incredibly difficult and harder to reach each individual max limit and pain and suffering and longer to recovery and not recommended. Give me the ability to do all both segments same time at the best doctor in the world for free, and I will still decline