The Posterior Cruciate Ligament ( Pcl ) Essay

1101 Words Dec 5th, 2015 5 Pages
The posterior cruciate ligament(PCL) is one of, if not, the strongest ligament in the knee and often described as the “primary stabilizer of the knee”(emedicine, Charles S Peterson, MD). While this is not one of the more common of the 4 stabilizing knee ligaments, it serves a great purpose. The posterior cruciate ligament is twice as strong and twice as thick than it’s “sister” anterior cruciate ligament (ACL). The PCL is extends from the lateral surface of the medial femoral condyle to the posterior aspect of the tibia. The term cruciate translates to “criss cross” which describes the PCL and ACL. Due to it being posterior and the ACL being anterior, the two resemble an x when in the anterior anatomical position. The PCL is the primary restraint for posterior tibial translation and is crucial for even simple tasks such as walking. The PCL consists of two fiber bundles, the anterolateral(AL) and posteromedial(PM) bundles. The AL bundle makes up approximately 65% and the PM approximately 35% of the PCL. During flexion becomes tight and the PM becomes lax. During extension, the AL is lax and the PM is tight. The center of these bundles relate to a clock. The AL bundle is centered at 10:20 ± 00:30 o’clock, and the PM bundle was centered at 08:30 ± 00:30 o’clock. Causes of PCL tears includes hyperextension, excessive force to the tibia or below the knee when flexed, or being injured when other ligament injuries occur. The ligament stretches to the point where it physically…

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