Anterolateral ligament (ALL) of the knee joint has been subjected to lot of controversies in the past few years. Even though this enigmatic structure was described under different descriptions, it got christened as anterolateral ligament by Claes in 2013 and since then it is being hugely discussed in orthopaedics forums. The biomechanical and radiological factors along with its function have been described recently, but the evidences are not concrete enough. One school of orthopaedic surgeons suggest that because of its ability to modulate internal rotation and attachment to the lateral meniscus, ALL contributes to the pivot shift phenomenon. Similarly, because of its oblique placement and variations in protocols, radiological and histological findings documented in the literature are also varied in nature. With the growing body of evidence, there is an increasing call for concomitant anterolateral stabilization along with anterior cruciate ligament reinforcement surgeries. The present review is an attempt to systematically review the anatomy, variations in classifications, descriptions, histology, radiology and biomechanical features of ALL. At the end of the review, we conclude that ALL is a distinct ligamentous structure located at the anterolateral aspect of the knee with the possible contribution to the tibial internal rotation stability.
Level of Evidence: I