The fibular ligament is one of the narrower ligaments of the knee that runs along the outside of the knee. It is more flexible than other ligaments and therefore less prone to injury. The ligament is a connective ligament between the fibula and the femur. The fibula is the smaller of the two bones in the lower leg. The other bone is the tibia. The fibula is the bone on the outward side of each leg. Other names for the structure include it being called the fibular lateral ligament, the long external lateral ligament, and the lateral collateral ligament (LCL). Other knee ligaments are more flattened in shape. This ligament is more round. On the femur, it connects to the lateral epicondyle. It runs down and back to where it connects to the head of the fibula. When the leg is straight, the ligament is pulled tight. It relaxes as the knee is bent. The ligament is over the anterior cruciate ligament (ACL). The ACL is the ligament most often torn in sporting injuries. The fibular ligament helps to stabilize the joint on the coronal plane. The coronal plane involves movement forward and backward.
Written and medically reviewed by the Healthline Editorial Team
In Depth: Fibular ligament