This might seem related to my previous post, but this is more about the methods. During the consultation, most doctors try to roughly approximate the total length you can go because of your bones and anatomy. How do they make this informed guess?

Specifically, how exactly do they determine those factors like overall bone health, etc., and how can I roughly find out it on my own in advance?

True, the general rule is 8 cm femurs, 6 cm tibias, but I am asking specifically about individualised cases.