I agree with you that most people have a femur longer than the tibia. But you can not say that everyone is like that. My doctor is one of the most famous in the world, and he's probably not an idiot, there are dozens of people here in the forum who did the surgery on him.
"most" people is an understatement, it is probably more than 99.99999% of people who
DON'T have a longer tibia than femur (meaning, their femur is longer). If the average tibia/fem ratio is 0.80 with a standard deviation of 0.03, then 3 standard deviations up would be 0.89 (tibia shorter than femur), which would be the top 0.15% (99.7% is 3 standard deviations coverage centered at 0.80), and 4 standard deviations up would be 0.92 (tibia still shorter than femur), which would be the top 0.0005% (99.99% is 3 standard deviations coverage centered at 0.80), and 5 standard deviations up would be 0.95 (again, tibia still shorter than femur), which would be the top 0.00003% (99.99994%% is 3 standard deviations coverage centered at 0.80), which at this point is the 5-sigma threshold for scientific observations to become a discovery.
At this point it is 1 in 3.5 million people who have a 0.95 tibia to femur ratio, and the tibia is STILL shorter than the femur.
The 6th standard deviation above the mean would be an astronomical number, and even
then it is still not more than 1, it is 0.98. You'd need to hit the 7th standard deviation which would be much much much higher than 1 in 3.5 million to achieve a ratio of greater than 1, which would mean the tibia is longer than the femur.
For all purposes and intent, a longer tibia than femur is not natural and doesn't occur in more than 99.9999% of normal humans.
Why do I care enough to type all this? I don't, I am just bored and like math and have nothing to do. *shrugs*. Nothing personal Ozzi lol.
References:
https://pubmed.ncbi.nlm.nih.gov/26398436/https://en.wikipedia.org/wiki/68%E2%80%9395%E2%80%9399.7_rulehttps://blogs.scientificamerican.com/observations/five-sigmawhats-that/#:~:text=So%2C%20what%20does%20five%2Dsigma,about%201%20in%203.5%20million.