Anterior cruciate ligament injury

Overview

Anterior cruciate ligament (ACL) injury is a tear or sprain in the ACL — one of the strong bands of tissue that help connect the thighbone to the shinbone at the knee. Most ACL injuries occur during sports such as soccer, basketball, football and downhill skiing.

Symptoms

Symptoms include knee swelling, instability and pain when standing.

Treatments

Treatment may include surgery and physical therapy.