Of the four major ligaments within the knee, (the Medial Collateral and Lateral Collateral, and the Anterior and Posterior Cruciate Ligaments), the PCL is perhaps the least noticeable when it is torn. A PCL tear is marked by a degree of instability, but less pain and swelling than marks a tear of the ACL or collateral ligaments. Often, a tear of the PCL is less noticeable because the other ligaments tend to "pick up the slack" for the torn or avulsed ligament.
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