How many bundles does the ACL consist of?

The anterior cruciate ligament (ACL) consists of two main bundles: the anteromedial (AM) bundle and the posterolateral (PL) bundle. Each bundle serves a distinct function during knee movements and is critical for maintaining the stability of the knee joint. The two-bundle structure allows for more precise control of knee motion, particularly during activities that involve pivoting or rapid changes in direction.

Understanding the bundle structure is important in both clinical assessments and surgical interventions, such as reconstructive procedures, where preserving or mimicking the natural configuration of the ACL can enhance outcomes. Knowledge of the two-bundle anatomy also aids in understanding how ACL injuries can vary in severity and the approaches to rehabilitation.