ACL Injury
Medically reviewed by Drugs.com. Last updated on May 4, 2025.
An anterior cruciate ligament (ACL) injury is a partial or complete tear of the ACL. The ACL is a ligament in your knee that connects the tibia (shin bone) to the femur (thigh bone). Ligaments are strong tissues that connect bones. The ACL stops the tibia from sliding too far forward and keeps the knee stable.
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DISCHARGE INSTRUCTIONS:
Return to the emergency department if:
- Your toes are cold or numb.
- Your knee becomes more weak or unstable.
- Your pain has increased, even after you take your pain medicine.
- Your swelling has increased.
Call your doctor or orthopedist if:
- You have a fever.
- Your symptoms are not getting better.
- You have questions or concerns about your condition or care.
Medicines:
You may need any of the following:
- NSAIDs , such as ibuprofen, help decrease swelling, pain, and fever. This medicine is available with or without a doctor's order. NSAIDs can cause stomach bleeding or kidney problems in certain people. If you take blood thinner medicine, always ask your healthcare provider if NSAIDs are safe for you. Always read the medicine label and follow directions.
- Acetaminophen decreases pain and fever. It is available without a doctor's order. Ask how much to take and how often to take it. Follow directions. Read the labels of all other medicines you are using to see if they also contain acetaminophen, or ask your doctor or pharmacist. Acetaminophen can cause liver damage if not taken correctly.
- Prescription pain medicine may be given. Ask your healthcare provider how to take this medicine safely. Some prescription pain medicines contain acetaminophen. Do not take other medicines that contain acetaminophen without talking to your healthcare provider. Too much acetaminophen may cause liver damage. Prescription pain medicine may cause constipation. Ask your healthcare provider how to prevent or treat constipation.
- Take your medicine as directed. Contact your healthcare provider if you think your medicine is not helping or if you have side effects. Tell your provider if you are allergic to any medicine. Keep a list of the medicines, vitamins, and herbs you take. Include the amounts, and when and why you take them. Bring the list or the pill bottles to follow-up visits. Carry your medicine list with you in case of an emergency.
Manage your ACL injury:
- Rest your leg as directed. Your healthcare provider will tell you when you can return to your normal daily activities. You may not be able to play certain sports until your knee heals. Talk to your provider about sports you currently play. You may need to make a safe plan to start playing the sport again.
- Apply ice to decrease swelling and pain. Use an ice pack, or put crushed ice in a plastic bag. Cover the bag with a towel and place it on the area for 15 to 20 minutes every hour. Use the ice for as long as directed.
- Apply compression to support the ligament and help decrease swelling. Your healthcare provider can tell you how often to do this.
- Elevate the area above the level of your heart as often as you can. This will help decrease or limit swelling. Rest your lower leg and foot on pillows. Do not put the pillow directly under your knee.
- Use support devices as directed. A knee brace may be used to limit movement and protect your knee. You may need to use crutches to help decrease pain as you move around.
- Go to physical therapy as directed. A physical therapist can teach you exercises to help improve movement and strength, and to decrease pain. The exercises can also help increase the range of motion in your knee.
Follow up with your doctor or orthopedist as directed:
Write down your questions so you remember to ask them during your visits.
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The above information is an educational aid only. It is not intended as medical advice for individual conditions or treatments. Talk to your doctor, nurse or pharmacist before following any medical regimen to see if it is safe and effective for you.
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