3D Illustration Of Human Body Femur Bone Anatomy. The Femur Or Thigh Bone, Is The Proximal Bone Of The Hindlimb In Tetrapod Vertebrates. The Head Of The Femur Articulates With The Acetabulum In The Pelvic Bone Forming The Hip Joint, While The Distal Part Of The Femur Articulates With The Tibia And Kneecap Forming The Knee Joint.