SymptomsBy Mayo Clinic staff
At the time of an ACL injury, signs and symptoms may include:
- A loud "pop" sound
- Severe pain and inability to continue activity
- Knee swelling that usually worsens for hours after the injury occurs
- A feeling of instability or "giving way" with weight bearing
When to see a doctor
Most people seek immediate medical attention after an ACL injury.
- Frontera WR, et al. Essentials of Physical Medicine and Rehabilitation: Musculoskeletal Disorders, Pain, and Rehabilitation. 2nd ed. Philadelphia, Pa.: Saunders Elsevier; 2008. http://www.mdconsult.com/das/book/body/208746819-6/0/1678/0.html. Accessed Oct. 25, 2012.
- Friedberg RP. Anterior cruciate ligament injury. http://www.uptodate.com /index. Accessed Oct. 25, 2012.
- ACL injury: Does it require surgery? American Academy of Orthopaedic Surgeons. http://orthoinfo.aaos.org/topic.cfm?topic=A00297. Accessed Oct. 25, 2012.
- DeLee JC, et al. DeLee & Drez's Orthopaedic Sports Medicine: Principles and Practice. 3rd ed. Philadelphia, Pa.: Saunders Elsevier; 2010. http://www.mdconsult.com/books/about.do?about=true&eid=4-u1.0-B978-1-4160-3143-7..X0001-2--TOP&isbn=978-1-4160-3143-7&uniqId=230100505-57. Accessed Oct. 25, 2012.
- Anterior cruciate ligament (ACL) injury prevention. American Orthopaedic Society for Sports Medicine. http://www.sportsmed.org/Patient/Sports_Tips/AOSSM_Sports_Tips_Sheets. Accessed Oct. 25, 2012.