An ACL tear is an injury to the anterior cruciate ligament (ACL) in your knee.

A meniscus tear occurs in the rubbery knee cartilage that cushions the shinbone from the thighbone.

A medial collateral ligament injury can be a stretch, partial tear, or complete tear of the ligament.

A posterior cruciate ligament tear is a rupture of the biggest and strongest ligament in the knee.

A patellar tendon tear is the partial or complete rupture of the connective tissue between the kneecap and the front part of the tibia.

The quadriceps tendon, which connects the quadriceps muscle to the knee, may partially or completely tear, meaning the muscle is no longer anchored to the kneecap.