A PCL tear refers to an injury to the posterior cruciate ligament, a key ligament located in the knee. This ligament helps stabilize the knee joint by connecting the thigh bone to the shin bone. A tear can occur due to sudden stops, changes in direction, or direct impacts, often seen in sports like football or basketball. Symptoms of a PCL tear may include pain, swelling, and difficulty in bending or straightening the knee. Diagnosis typically involves a physical examination and imaging tests like an MRI. Treatment options range from rest and physical therapy to surgery, depending on the severity of the tear.