What is the name of the ridge of bone that separates the AM and PL bundles of the ACL on the femur?

The bifurcate ridge is specifically recognized as the anatomical structure that separates the anteromedial (AM) and posterolateral (PL) bundles of the anterior cruciate ligament (ACL) on the femur. This ridge serves as a critical landmark for orthopedic surgeons and sports medicine practitioners when considering ACL anatomy, injuries, and repair techniques. Understanding the relationship and location of the bifurcate ridge is essential for accurate surgical procedures and interventions, as it indicates where the two bundles attach to the femur.

The other options don't accurately represent this specific structure. The crest of the femur generally refers to broader definitions of bony elevations rather than a distinct ridge related to the ACL. The ligamentous ridge, while it might suggest a similar concept, isn’t the recognized term for this anatomical feature. The intercondylar ridge pertains to a different area of the femur, primarily involved in articulating with the tibia, rather than demarcating the ACL bundles. Hence, the bifurcate ridge is the most accurate answer in this context.