The posterior oblique ligament is a structure that considered by some to be part of the medial collateral ligament and by others to be a ligament in its own right.
Function of the Posterior Oblique Ligament
It helps to prevent the tibia from sliding too far backwards, and is an important restrained when the posterior cruciate ligament is damaged.
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CLINICAL PUBLICATIONS
The role of the posterior oblique ligament in controlling posterior tibial translation in the posterior cruciate ligament-deficient knee. Petersen W, Loerch S, Schanz S, Raschke M and Zantop T. Am J Sports Med. 2008 Mar;36(3):495-501. doi: 10.1177/0363546507310077. Epub 2008 Jan 8.