Knee Replacement

(Knee Arthroplasty; Total Knee Replacement)

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Definition

Knee replacement, also called arthroplasty, is a surgical procedure to replace a knee damaged by disease or injury.Recovery may take several weeks to months depending on your overall health.
Total Knee Replacement
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Reasons for Procedure

This is done if you have chronic pain and stiffness in the knee joint that limits activities.Knee replacement surgery is most often done to:
  • Ease knee pain and disability due to arthritis or previous severe knee injury
  • Correct a knee deformity

Possible Complications

Problems from the procedure are rare, but all procedures have some risk. Your doctor will review potential problems, like:
  • Infection
  • Excess bleeding
  • Swelling
  • Blood clots
  • Chronic weakness in knee joint
  • Worsening or unchanged pain
Factors that may increase the risk of complications include:
  • Smoking
  • Poor nutrition
  • History of blood clots
  • Long-term illness
  • Use of certain medications

What to Expect

Prior to Procedure

Your doctor will likely do the following:
  • Physical exam
  • Blood tests
  • X-ray
  • MRI scan to get images of the internal structure of the knee
Before surgery, you will need to:
  • Arrange for a ride home.
  • Arrange for help at home while you recover.
  • Talk to your doctor about any allergies you have.
  • Ask your doctor about assist devices you will need.
  • If you are overweight, lose weight. This will help to decrease the amount of stress on your new joint.
  • Install safety equipment in the bathroom, shower, and on the stairs.
  • Prepare a bedroom on the first floor if possible. Climbing stairs will be difficult at first.
Talk to your doctor about any medications, herbs, or supplements you are taking. You may be asked to stop taking some medications up to 1 week before the procedure.Do not eat or drink anything after midnight the day before your surgery, unless told otherwise by your doctor.

Anesthesia

Anesthesia will keep you pain-free and comfortable during the procedure. General anesthesia will keep you asleep during the procedure. Regional anesthesia will number the lower part of the body.

Description of the Procedure

A cut will be made in your skin. The damaged cartilage and bone will be removed. The remaining bone will be prepared to receive the new joint made from material such as plastic and metal. The artificial joint will be placed in the proper position. It may be cemented within the bone. The incision will be closed with staples. A drain will be left in to allow extra fluid to flow out.

How Long Will It Take?

About 2 hours.

How Much Will It Hurt?

Anesthesia will block pain during the procedure. You will have pain after the procedure. Ask your doctor about medication to help manage pain.

Average Hospital Stay

This procedure is done in a hospital setting. The usual length of stay is 3-4 days. Your doctor may choose to keep you longer if complications arise.

Post-procedure Care

At the HospitalRight after the procedure, you will be taken to recovery and monitored closely. The staff may give you:
  • Pain medication
  • Antibiotics to prevent infection
  • Medication that prevents blood clots
While you are recovering at the hospital, you may need to use a continuous passive motion machine, which is designed to:
  • Slowly move your knee
  • Restore function
  • Decrease swelling
  • Improve circulation
During your recovery, you will need to:
  • Move your foot and ankle to increase blood flow back to your heart.
  • Wear support stockings. These may help prevent blood clots from forming in your legs.
  • Work with a physical therapist. You may start the day after surgery. You will learn safe ways to move your knee and support your weight.
  • You will learn how to use a walker, crutches, or other support devices.
At HomeTo help ensure a smooth recovery at home, take these steps:
  • Start working with a physical therapist once you are instructed to. The therapist will focus on balance, range-of-motion, and strength training.
  • Maintain a healthy weight after surgery.
Within 6 weeks, you should be able to go back to light activities and driving. You may feel a soft clicking in the joint when walking or bending. Continue to work with the physical therapist. Water-based exercises may help to improve joint pain, swelling around the knee, and range of motion.Antibiotics may be needed before certain dental procedures or surgeries now that you have an artificial joint. This will prevent possible infections from entering the bloodstream. Make sure to let the dentist or doctor know that you have an artificial joint.

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