Symptoms

Signs and symptoms of an ACL injury usually include:

• A loud pop or a "popping" sensation in the knee
• Severe pain and inability to continue activity
• Rapid swelling
• Loss of range of motion
• A feeling of instability or "giving way" with weight bearing

When to see a doctor

Seek immediate care if any injury to your knee causes signs or symptoms of an ACL injury. The knee joint is a complex structure of bones, ligaments, tendons and other tissues that work together. It's important to get a prompt and accurate diagnosis to determine the severity of the injury and get proper treatment.