Posterior Cruciate Ligament PCL Tear

A 35-year-old taxi driver presents three weeks after a high-speed motor vehicle collision with his flexed knee striking the dashboard. He reports posterior knee pain, difficulty descending stairs with a sense of backward slipping, and positive posterior sag sign on examination. MRI of the knee is shown. The structure marked **A** demonstrates thickening with increased T2 signal and fiber discontinuity in the mid-substance. Which of the following best describes the mechanism of injury to the structure marked **A** in this clinical scenario?