The largest bone in the human body is the femur. It can support 30 times the weight of a person’s body. Ounce for ounce, that’s stronger than steel.
The femur is the large bone between the knee and hip joints. Its size and strength make it a very important base for soft tissue attachment, weight bearing, and bio-mechanical purposes. The femur is a long bone, which means it has a hard outer surface known as compact bone, with a mesh-like interior called cancellous bone, designed to take pressure from multiple angles.
It is also useful to note that the cancellous bone contains bone marrow. The femur helps to make up two joints distally, articulating with the tibia and the patella, creating the tibiofemoral and patellofemoral joints respectively. Superiorly, the femur slips into the acetabulum of the hip, creating the acetabulofemoral joint.