Sprained ankle or knee.   Remember the acronym RICE for treatment of most sports injuries: rest, ice, compression, and elevation. Apply continuous compression by wrapping an elastic bandage around the ankle or knee. Numbness, tingling, or increased pain means the bandage is too tight. Keep the bandage on for 24 to 48 hours. Put a cold pack or plastic bag of crushed ice on the ankle or knee. Do this 20 minutes of every hour while your child is awake for the first 4 hours after the injury. Ice and compression reduce bleeding, swelling, and pain. Keep the injured ankle or knee elevated and at rest for 24 hours. Give acetaminophen or ibuprofen as needed for pain. Call your child's doctor for further instructions.