Anterior Cruciate Ligament Injury Symptoms & Diagnosis

Symptoms

When the ACL tears, you may hear a popping sound. As you stand, the knee will probably give-way immediately, and it will be difficult to walk on the affected leg. There is usually moderate pain and swelling of the knee joint, although in the first several hours, this may be minor. It will, however, worsen over the first two days, and then begin to subside.

Diagnosis

The doctor will ask about your symptoms and how you injured your knee. A physical exam will be performed.

Tests may include:

MRI scan —a test that uses magnetic waves to show the structures inside the knee joint
Arthroscopy —a thin, lighted tube inserted through a small incision in the knee to look at the structures inside the knee

Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition. Copyright © 2025 EBSCO Publishing All rights reserved.