Health A–Z guide
ACL Injuries
An ACL injury refers to damage to the anterior cruciate ligament (ACL), one of the key ligaments that stabilizes the knee joint. The ACL connects the thigh...
Table of Contents
An ACL injury refers to damage to the anterior cruciate ligament (ACL), one of the key ligaments that stabilizes the knee joint. The ACL connects the thigh bone (femur) to the shin bone (tibia) and helps control knee movement, especially during sudden stops, direction changes, or jumping.
ACL injuries commonly occur during sports or physical activities that involve quick pivoting, cutting, or landing awkwardly—such as soccer, basketball, skiing, and football. They can range from mild stretching to a complete tear.
Common symptoms include:
-
A popping sound or sensation at the time of injury
-
Knee pain and swelling
-
Instability or the feeling that the knee may “give out”
-
Reduced range of motion
Treatment depends on the severity of the injury and the individual’s activity level. Options may include rest and rehabilitation, physical therapy, or surgical reconstruction followed by structured recovery exercises.
With proper diagnosis, treatment, and rehabilitation, many people can regain knee strength, stability, and return to normal activities safely.
Was this page helpful?
Thanks for your feedback! What could we improve?
Thank you! Your feedback helps us improve our guides.
Our Health A–Z guides are written by the True Impact Health Editorial Team and based on reliable sources such as public health agencies, clinical guidelines and peer-reviewed research. This guide has not yet been medically reviewed. Read our editorial process.
This content is for general information and is not a substitute for professional medical advice, diagnosis or treatment.