How the Knee's 4 Ligaments Work

The complex anatomy and biomechanical functions of the four primary ligaments—the ACL, PCL, MCL, and LCL—which maintain stability in the human knee. It explains how these structures work in concert to restrict abnormal sliding and rotation of the tibia relative to the femur while highlighting their unique insertion points and fiber bundles. Beyond the main ligaments, the source explores secondary stabilizers, such as the posterolateral corner and various capsular ligaments, which provide additional reinforcement against joint stress and hyperextension. The overview also includes technical insights into the nerve supply, blood flow, and viscoelastic properties that allow these tissues to manage physical loads. Finally, it notes how specific physical movements and external forces can influence the strain placed on these critical connective tissues.