Assertion: patella | /r/CapableOf | leave distal surface of the femur
Facets:
Source sentences:
text: The patella leaves the distal surface of the femur as the knee is extended and lies more and more in contact with the supracondylar surface; and in full extension in the human subject, when the femur and tibia are in vertical alignment, it is entirely on the anterior surface of the femur.