The femur is the thigh bone.

notes

femur from front femur from back  
The femur from the front The femur from the back  
Synonyms: 
thighbone
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Knee bones from above

Simple illustrations to give a birds' eye view of the knee bones.

Knee bones from front (bent knee)

Brief introduction to the bony anatomy of the knee, with clear illustrations.

Knee anatomy intro

This page demonstrates the bones of the knee - femur, tibia, and patella. The shock-absorbing menisci fill the gap between the rounded ends of the femur bone and the flattened upper surface of the tibia bone. The cruciate ligaments act as a 'stay' to allow movement of the femur and tibia, without the movement being excessive.

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CLINICAL PUBLICATIONS

Prosthetic inlay resurfacing for the treatment of focal, full thickness cartilage defects of the femoral condyle: a bridge between biologics and conventional arthroplasty. Bollars P, Bosquet, M, Vandekerckhove B, Hardeman F and Bellemans, J. Knee Surg Sports Traumatol Arthrosc; 2012 Sep;20(9):1753-9