The fibula is a long, slender bone located on the lateral side of the lower leg, running parallel to the larger tibia bone. Though it bears minimal weight compared to the tibia, the fibula provides crucial stability to the ankle joint and serves as an attachment site for multiple muscles of the lower leg. It forms the lateral malleolus (the bony prominence on the outside of the ankle), which helps maintain ankle alignment.
The term "fibula" comes from Latin, where it originally meant "clasp" or "pin," likely referring to its long, slender appearance. Ancient Romans used a similar word for brooches or clasps used to fasten garments.
Without a functioning fibula, humans would experience significant ankle instability and weakness in lateral leg movements. The absence or damage to this bone would compromise proper foot position, decrease control during walking on uneven surfaces, reduce power in activities like pushing off while running.
