The fibula is the slender long bone that is attached next to and a little below the tibia (shinbone). It bears very little body weight. The fibula provides lateral stability for the lower leg and acts as a tie rod to increase the range of motion for the ankle, especially lateral and medial rotation of the foot.
This bone is located in the calf, lateral to the tibia, and is the smaller of the two lower leg bones. Both ends of the fibula attach to the tibia with ligaments SportsInjuryClinic.net says the lateral collateral ligament on the outside of the knee joint attaches the fibula to the upper leg bone, the femur.
Anatomical terms of bone. [edit on Wikidata] The fibula or calf bone is a leg bone located on the lateral side of the tibia, with which it is connected above and below. It is the smaller of the two bones, and, in proportion to its length, the slenderest of all the long bones.