The fibular collateral ligament is an important structure of the knee joint responsible for maintaining its stability. In medical terminology, it is also called the lateral collateral ligament or the lateral collateral ligament complex. These synonyms are often used interchangeably to describe the same structure. Another term that may be used to represent the fibular collateral ligament is the fibular collateral ligament band. Regardless of the name used, the fibular collateral ligament plays a crucial role in supporting the knee joint, preventing abnormal lateral movement, and providing stability during physical activities such as walking or running.