How many minutes is the ideal time to apply ice pack on knee injuries every other hour for a day or two have a good effect?

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Medically Reviewed by Nayana Ambardekar, MD on April 24, 2021

If you’ve ever hurt your ankle or had another type of sprain or strain, chances are your doctor recommended rest, ice, compression, and elevation (RICE) as one of your first treatments. The RICE method is a simple self-care technique that helps reduce swelling, ease pain, and speed up healing.

You can treat minor injuries with the RICE method at home. You might try it if you have an achy knee, ankle, or wrist after playing sports. If you have pain or swelling that gets worse or doesn’t go away, see a doctor.

The RICE method includes the following four steps:

Pain is your body’s signal that something is wrong. As soon as you’re hurt, stop your activity, and rest as much as possible for the first 2 days. Don’t try to follow the “no pain, no gain” philosophy. Doing so with certain injuries, like a moderate to severe ankle sprain, can make the damage worse and delay your recovery. Doctors say you should avoid putting weight on the injured area for 24 to 48 hours. Resting also helps prevent further bruising.

Ice is a tried-and-true tool for reducing pain and swelling. Apply an ice pack (covered with a light, absorbent towel to help prevent frostbite) for 15-20 minutes every two to three hours during the first 24 to 48 hours after your injury.  Don’t have an ice pack? A bag of frozen peas or corn will work just fine.

This means wrapping the injured area to prevent swelling. Wrap the affected area with an elastic medical bandage (like an ACE bandage). You want it to be snug but not too tight -- if it’s too tight, it’ll interrupt blood flow. If the skin below the wrap turns blue or feels cold, numb, or tingly, loosen the bandage. If these symptoms don’t disappear right away, seek immediate medical help.

This means raising the sore body part above the level of your heart. Doing so reduces pain, throbbing, and swelling. It’s not as tricky to do as you might think. For example, if you have an ankle sprain, you can prop your leg up on pillows while sitting on the sofa. The CDC recommends you keep the injured area raised whenever possible, even when you’re not icing it.

Your doctor may suggest using nonsteroidal anti-inflammatory medications (like ibuprofen or naproxen) along with the RICE treatment. These are available over the counter and by prescription. Talk to your doctor about your health history before taking these medications.

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The recommended treatment for most acute injuries is referred to as the PRICE principle. This is an acronym for protection, rest, ice, compression, and elevation. 

The goal of this treatment is to:  

  • Reduce pain and swelling  
  • Lay the foundation for a good rehabilitation  

We  recommend continuing the treatment for at least 48 hours after the time of the injury. However, some of the elements are more applicable than others. 

Protection

In this context, it means to remove the athlete from play to protect against further injury. This is especially important in the first 48 hours after the injury occurred.

Rest

The athlete should not continue with any activity following the injury. A general recommendation is that the knee should be offloaded during the first 24 hours.

Ice

The  aim of applying ice is to relieve pain. 20 minutes with an ice pack every other hour for a day or two has a good effect.  

Even though there are many commercial ice products available, the best solution is often a plastic bag filled with crushed ice and some water. Place a damp towel between the ice pack and skin.

Compression

The most important aspect of first aid treatment for acute knee injuries is compression. This can reduce swelling. Use an elastic bandage and start wrapping it around the knee. Start from below the knee and finish slightly above it. The bandage should be as tight as possible, without stopping blood flow past the injury site.  Signs that the bandage is too tight can include numbness, tingling and increased pain.

Elevation

Swelling in the knee can often be limited by keeping the knee elevated. Let the foot rest above hip level on a chair or cushion. This is particularly important in the first few hours, but it is best to continue to keep it elevated as much as possible for the first 24 hours. Remember that compression should be maintained around the clock to keep internal bleeding (swelling) to a minimum.

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