<Tr> <Th> FMA </Th> <Td> 9611 </Td> </Tr> <Tr> <Td_colspan="2"> Anatomical terms of bone (edit on Wikidata) </Td> </Tr> <P> The femur (/ ˈfiːmər /, pl . femurs or femora / ˈfɛmərə /) 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 . By most measures the femur is the strongest bone in the body . The femur is also the longest bone in the human body . </P> <P> The femur is the only bone in the upper leg . The two femurs converge medially toward the knees, where they articulate with the proximal ends of the tibiae . The angle of convergence of the femora is a major factor in determining the femoral - tibial angle . Human females have wider pelvic bones, causing their femora to converge more than in males . In the condition genu valgum (knock knee) the femurs converge so much that the knees touch one another . The opposite extreme is genu varum (bow - leggedness). In the general population of people without either genu valgum or genu varum, the femoral - tibial angle is about 175 degrees . </P>

These is the area where your femur articulates with your pelvis