You got me thinking about my bone dagger, as to whether it is a human femur or not. I found this good anatomy tutorial. If you follow it carefully even though my dagger has been carved there is still enough anatomical detail left to assume it is probably the femur of the right leg. The details are in the distal femur. The medial & lateral condyles, medial adductor tubercle and more.
https://www.youtube.com/watch?v=oi0cOvuhsa8