A Posterior Cruciate Ligament (PCL) injury occurs when the ligament, located in the knee, is stretched or torn. This injury often results from a direct blow to the knee, such as during sports activities or accidents. Symptoms may include pain, swelling, and difficulty in moving the knee. Diagnosis typically involves a physical examination and imaging tests like an MRI. Treatment options range from rest and physical therapy to surgical intervention, depending on the severity of the injury. Proper rehabilitation is essential for restoring knee function and preventing future injuries.