Which long bone is the strongest in the body?

Which long bone is the strongest in the body?

• A. Tibia
• B. Humerus
• C. Radius
• D. Femur

Answer: (D)

In bone biomechanics, strength of a long bone comes from its cross-sectional area and the thickness of its cortical bone, which determine how well it resists bending and compressive forces. The femur has the largest diameter and the thickest cortical shell among the long bones, giving it exceptional resistance to bending and the ability to carry the greatest loads. It acts as the main weight-bearing bone of the leg, transmitting forces from the hip down to the knee during standing, walking, and running. That combination of size and material properties makes the femur stronger than the other listed bones. The tibia is also a major weight-bearing bone but with a smaller cross-section, while the humerus and radius are shaped for mobility and different loading patterns, not the extreme axial and bending forces the femur routinely experiences.

In bone biomechanics, strength of a long bone comes from its cross-sectional area and the thickness of its cortical bone, which determine how well it resists bending and compressive forces. The femur has the largest diameter and the thickest cortical shell among the long bones, giving it exceptional resistance to bending and the ability to carry the greatest loads. It acts as the main weight-bearing bone of the leg, transmitting forces from the hip down to the knee during standing, walking, and running. That combination of size and material properties makes the femur stronger than the other listed bones. The tibia is also a major weight-bearing bone but with a smaller cross-section, while the humerus and radius are shaped for mobility and different loading patterns, not the extreme axial and bending forces the femur routinely experiences.