Knee Sprain

ExitCare ImageA knee sprain is a tear in one of the strong, fibrous tissues that connect the bones (ligaments) in your knee. The severity of the sprain depends on how much of the ligament is torn. The tear can be either partial or complete.


Often, sprains are a result of a fall or injury. The force of the impact causes the fibers of your ligament to stretch too much. This excess tension causes the fibers of your ligament to tear.


You may have some loss of motion in your knee. Other symptoms include:

  • Bruising.

  • Tenderness.

  • Swelling.


In order to diagnose knee sprain, your caregiver will physically examine your knee to determine how torn the ligament is. Your caregiver may also suggest an X-ray exam of your knee to make sure no bones are broken.


If your ligament is only partially torn, treatment usually involves keeping the knee in a fixed position (immobilization) or bracing your knee for activities that require movement for several weeks. To do this, your caregiver will apply a bandage, cast, or splint to keep your knee from moving or support your knee during movement until it heals. For a partially torn ligament, the healing process usually takes 4 to 6 weeks.

If your ligament is completely torn, depending on which ligament it is, you may need surgery to reconnect the ligament to the bone or reconstruct it. After surgery, a cast or splint may be applied and will need to stay on your knee for 4 to 6 weeks while your ligament heals.


  • Keep your injured knee elevated to decrease swelling.

  • To ease pain and swelling, apply ice to your knee twice a day, for 2 to 3 days:

  • Put ice in a plastic bag.

  • Place a towel between your skin and the bag.

  • Leave the ice on for 15 minutes.

  • Only take over-the-counter or prescription medicine for pain as directed by your caregiver.

  • Do not leave your knee unprotected until pain and stiffness go away (usually 4 to 6 weeks).

  • Do not allow your cast or splint to get wet. If you have been instructed not to remove it, cover your cast or splint with a plastic bag when you shower or bathe. Do not swim.

  • Your caregiver may suggest exercises for you to do during your recovery to prevent or limit permanent weakness and stiffness.


  • Your cast or splint becomes damaged.

  • Your pain becomes worse.


  • Understand these instructions.

  • Will watch your condition.

  • Will get help right away if you are not doing well or get worse.