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Knee Replacement Rehabilitation

Information about exercises and activity following knee replacement surgery

By Jonathan Cluett, M.D., About.com

Updated: July 7, 2008

About.com Health's Disease and Condition content is reviewed by Kate Grossman, MD

Once you have decided to have knee replacement surgery, you have committed yourself to a bit of work! Knee replacement surgery is very successful, but the success of the procedure is due, in part, to the rehabilitation period that follows the surgery. For patients to expect a good result from knee replacement surgery, they must be an active rehab participant!

    • It is very important that you follow your doctor's specific instructions! The information here is only a general guide, and should, under no circumstances, replace or substitute your doctor's instructions. If you have any questions pertaining to your surgery, you should speak with your doctor.

The First Days After Knee Replacement

In the first days following knee replacement surgery you will begin your formal rehabilitation. Following surgery, the knee replacement implants are set firmly in place. This allows you to have confidence that you can place your full body weight on the knee. While pain may prevent full weight on the leg, the joint implant can withstand these forces.

In the first day or two following surgery, you will work on becoming more mobile. Early exercises are focused on stimulating blood flow of the extremities by contracting muscles:

  • Ankle pumps
    Foot and ankle pumps help to prevent stiff ankles, and also help circulate blood in the extremities.

  • Straight Leg Raises
    Keeping the knee straight, tighten up the muscles on the front of the thigh (the quads) and lift your heel up off the bed.
Over the coming days, you will work to achieve some of the goals you will need to return to independent living. Most patients stay in the hospital for 3-6 days. You may then be sent home if they can do the following:
  • Walk down the hallway with a walker or crutches
  • Climb a short set of stairs
  • Fully straighten the knee
  • Bend the knee (hopefully to 90 degrees)
  • Perform home exercises
If you cannot perform these activities, you may be sent to a rehabilitation facility for a week or two to work on the exercises and activities.

Once Back At Home

Upon returning home, it is important that you be diligent about your rehabilitation and post-operative care. Again, it is the first six weeks following knee replacement that can have a significant impact on the overall outcome of this surgery.
  • Activities
    Patients can walk as much as tolerated following surgery. Some activities should be avoided in the first few weeks after surgery. These include kneeling, driving, heavy lifting, strenuous activity, and sexual activities.

    Patients usually take at least a month or two off from work, but can return as soon as they are comfortable. Timing of returning to work depends on what activities are necessary for your work. As soon as you are comfortable, you can return to work.

  • Exercises
    Exercises are very important following knee replacement surgery. Exercises will accomplish several goals. Primarily, the exercises are focused on increasing strength of the quadriceps and hamstrings and increasing motion of the knee.

    Patients should work hard to ensure they call fully extend (straighten) their knee, and flex (bend) the knee to at least 90 degrees. Some patients are given a CPM, or continuous passive motion machine to help with bending. For more information, read on about the use of CPM machines after knee surgery.

  • Incision Care
    The incision should be kept clean and dry. If the bandage gets wet, a dry, fresh bandage should be placed. Your doctor will let you know when he or she feels it is OK to shower.

    You should look for signs of infection, such as redness or increasing drainage from the wound. Also let your doctor know if you have a fever, sudden increase of pain, increased swelling, or other symptoms that you are concerned about.

    Among the most common complications following knee replacement surgery are blood clots. Let your doctor know if you have calf pain or swelling, or if you have chest pain or shortness of breath. All of these can be signs of a blood clot.

  • Diet & Medications
    Patients can usually resume their regular diet upon returning home. Make sure you have a list of all medications you need following discharge from the hospital. Furthermore, make sure you know when and for how long to take any new medications.

    You will be placed on a blood thinner after surgery. Some blood thinners are given by injections; the other commonly used blood thinner is taken by mouth (Coumadin). If taking Coumadin, you will need your blood checked periodically to make sure it is not getting too thin. Also, patients taking Coumadin should avoid foods rich in Vitamin K (mostly green, leafy vegetables).

Need A Knee Replacement?

Considering knee replacement surgery? Sign-up for this 7 week e-course. Each week you'll receive a newsletter devoted to issues surrounding total knee replacement surgery. Topics covered include why knee replacements are done, alternatives to surgery, how the surgery is performed, and what the rehab is like. At the end of 7 weeks, you'll have a firm understanding of this procedure.

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