Skip to content

Anterior Cruciate Ligament (ACL) Injuries

Font Size

When To Call a Doctor

Call your doctor immediately if you have an injury to your knee and:

  • You have severe pain in your knee.
  • Your knee appears to be deformed.
  • You have signs of damage to the nerves or blood vessels. Signs include numbness, tingling, a "pins-and-needles" sensation below the injury, an inability to move your leg below the injury, pale or bluish skin, or your leg feels cold.
  • You have severe swelling in your knee right after the injury.

Call your doctor today if:

  • Your knee begins to swell within 2 hours of the injury.
  • You hear or feel a pop in your knee during an injury.
  • Your knee won't bear weight.
  • You are unable to straighten your leg completely.
  • Your knee is unstable, buckles, or gives out.
  • Your knee "locks" in one position.
  • You have had an anterior cruciate ligament (ACL) injury in the past, and you have reinjured your knee.

Before your appointment, don't put weight on the injured knee. Use crutches if you need to. Apply ice and wrap your knee in an elastic bandage or neoprene (synthetic rubber) sleeve. Rest and elevate the knee. Take a nonsteroidal anti-inflammatory drug, such as ibuprofen (Advil) or naproxen (Aleve), to reduce swelling. For more information on first aid steps, see Home Treatment.

Watchful waiting

Watchful waiting is a period of time during which you and your doctor observe your symptoms or condition without using medical treatment. Watchful waiting is not appropriate if knee pain is severe; if your knee is deformed, swells, or has limited movement immediately after an injury; or if you are unable to bear any weight because of either pain or instability.

Serious knee injuries need to be checked for possible broken bones as well as ligament or cartilage camera.gif damage. Whenever immediate swelling follows an injury, there also may be torn blood vessels or damaged nerves in the knee. Your doctor will check your knee to make sure the blood supply to your leg is normal and the nerves are intact.

If you have occasional pain in your knee or your knee sometimes gives way or buckles, have your doctor check it. If you have damaged your ACL, it is important to get treatment so that your knee is appropriately managed. This may reduce the chance that you will get osteoarthritis in your knee.

1|2

WebMD Medical Reference from Healthwise

Last Updated: November 14, 2014
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
Next Article:

Hot Topics

WebMD Video: Now Playing

Click here to wach video: Dirty Truth About Hand Washing

Which sex is the worst about washing up? Why is it so important? We’ve got the dirty truth on how and when to wash your hands.

Click here to watch video: Dirty Truth About Hand Washing

Popular Slideshows & Tools on WebMD

disciplining a boy
Types, symptoms, causes.
psoriasis
Does your kid have symptoms?
fruit drinks
Eat these to think better.
No gym workout
Moves to help control blood sugar.
acupuncture needle on shoulder
10 tips to look and feel good.
Close up of eye
12 reasons you're distracted.
Epinephrine Injection using Auto-Injector Syringe
Life-threatening triggers.
woman biting a big ice cube
Habits that wreck your teeth.
embarrassed woman
Do you feel guilty after eating?
pacemaker next to xray
Treatment options.
caregiver with parent
10 tips for daily life.
birth control pills
Which kind is right for you?

Women's Health Newsletter

Find out what women really need.