PCL tears are graded by the severity of the injury, quality I via quality III. The quality is determined because of the extent of laxity measured through your examination. On the whole, grading of the injury corresponds to the next: The 2 bundles can not be independently identified on MRI https://www.theorthopaedicandpainpractice.com/what-happens-if-i-injure-my-posterior-cruciate-ligament/