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Wall 732.974.0404 |
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Wall 732.974.0404 |
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Total Knee Replacement Total knee replacement or "arthroplasty" is the relining of the joint (bone end surfaces) with artificial parts called prostheses. There are three components used in the artificial knee. The femoral (thigh) component is made of metal and covers the end of the thigh bone. It may be cemented to the bone or, for some prostheses, inserted without cement for bone to grow into the porous coating allowing for stable fixation.
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The tibial (shin bone) component, made of metal and polyethylene (medical-grade plastic), covers the top end of the tibia. The metal forms the base of this component, while the polyethylene is attached to the top of the metal to serve as a cushion and smooth gliding surface between the metal of the femoral and tibial components. The tibial component may be secured to the bone with bone cement or, for some porous coated prostheses, biologically fixed by tissue ingrowth. The third component, the patella or knee cap, may be all polyethylene
or a combination of metal and polyethylene. Depending on the prosthesis
used, this
Your Knee Evaluation An orthopaedic surgeon specializes in problems affecting bones and joints. Your knee evaluation will begin with a detailed questionnaire. Your medical history is very important in determining whether surgery is necessary and medically safe. It helps the surgeon understand your pain, limitations in activity and the progression of your knee problem. After your history is taken, a physical exam is performed. The range of motion of your knee is measured, your legs are evaluated for variances such as bowlegs or knock-knees, and your muscle strength is analyzed. The surgeon will observe how you walk, sit, bend and move. X-rays are taken of your knee joint. You should bring any X-rays that may have been taken of your knee in the past. These X-rays will help your surgeon plan the surgery and evaluate the fit of your new knee prosthesis. A small amount of fluid may be taken from your knee joint to check for infection. After your initial orthopaedic evaluation, the surgeon will discuss all possible alternatives to surgery. If the X-rays show severe joint damage and no other means of treatment has provided relief, total knee replacement may be recommended. Before Surgery You may be asked to see your family physician or an internal medicine doctor for a more thorough medical evaluation. To prepare yourself for surgery, you may be asked to do a number of things. You may be asked to lose weight if you are overweight. If you smoke, it is important for you to stop two weeks prior to surgery. If you are taking aspirin or certain arthritis medications, inform your surgeon; you may need to stop taking these two weeks before surgery. If you take estrogen (i.e. Premarin), your surgeon will probably advise you to stop taking it one month prior to surgery. Your doctor may want you to donate your own blood ahead of time for a possible transfusion during surgery.
Your Surgery You will probably be admitted to the hospital the morning of surgery. You cannot eat or drink anything after midnight the day of surgery. On your day of surgery, you will be taken to the operating room about a half hour early. In order to receive medications and blood transfusions during surgery, an intravenous (IV) line will be started. The anesthesiologist will speak to you before surgery and discuss the type of anesthetic to be used.
The Recovery Room You will awaken after your surgery in the Post-Anesthesia Recovery Room. You will remain there until you have recovered from the anesthesia, are breathing well, and your blood pressure and pulse are stable. You may feel as though you only left your room for a few minutes. If you experience pain, medication will be available
What To Expect After Surgery You may have a tube or drain coming through the surgical dressing that is attached to a drainage apparatus. This system provides gentle, continuous suction to remove any blood that accumulates in the surgical area. The drain will probably be removed several days after surgery. The dressing will also be changed and a smaller one applied. An "immobilizer" (a cloth support with stays) will fit around this dressing and will hold your leg straight. An alternative to the operated leg being immobilized after surgery is the use of a "Continuous Passive Motion" (CPM) machine. Your leg is held softly in a cradle. The knee is then gently and slowly bent and straightened. Your leg will be supported and elevated on one or two pillows to help your circulation and stretch the muscles behind your leg. You will be asked to move your ankle to promote circulation and prevent stiffness in your ankle joint. The immobilizer may be used the first 48 hours after surgery, then removed. The CPM machine may be used the next 48 hours or longer, if needed, even after you leave the hospital. The nurse will assist you in turning on your side, if you wish. You may adjust the head of the bed to any level you desire. The knee adjustment on the bed should not be used. Your knee should remain straight unless you are performing knee exercises. An IV may remain in your arm for several days to administer antibiotics or other medications you may need. This helps prevent infection and gives you proper nourishment until you are eating and drinking comfortably. You will begin regular fluid and food intake under the direction and advice of your surgeon. To prevent problems in your lungs, you may receive an incentive spirometer after surgery to encourage you to cough and breathe deeply. This is used every hour while you are awake. It is normal to feel pain and discomfort after surgery. Inform the nurse of your pain, and medication will be ordered. Physical Therapy
Your knee rehabilitation program, which begins 24 hours after
surgery, is ordered by your surgeon and done under his supervision
and/or control. Isometric exercises (tightening muscles without
moving the joint) will begin while you are still in bed. These exercises will help you regain strength and mobility. The therapist will teach you the safest methods for getting in and out of bed or a chair, and on and off the toilet. You will be taught the do's and don'ts of joint replacement recovery. The day after surgery, you will probably begin walking and exercising your knee joint. The exercises will probably be done twice daily. Initially, the physical therapist will assist you in getting out of bed and standing at the bedside with a walker. For your entire hospital stay, you will walk with a walker or crutches under the supervision of a therapist. Your walking distance will gradually increase. When you are strong enough, you will be able to walk without the support of the immobilizer.
You will probably begin range of motion exercises on your first
postoperative day. Through progressive daily exercises, you may
achieve about a 90-degree bend in the knee joint by the time you
leave the hospital.
Bending your knee during the exercises may be painful. Pain medication taken before therapy will make the exercises more comfortable. Ice packs, hot packs and other treatments may be used to assist you in bending your knee. The therapist will check your progress daily and will keep your surgeon informed. Progress The usual hospital stay for knee joint replacement is usually three to five days. Depending on your progress, you will probably gain independence within one week after surgery. To accommodate sitting, there will be an elevated chair and commode available for your use. An elevated toilet seat will be ordered for you to take home. At home, you will need a firm chair with arms. The therapist will teach you how to dress, get out of bed without help and use a walker or crutches. You will continue strengthening exercises in preparation for your return home. It is important for you to adhere to your surgeon's directions and follow proper positioning techniques throughout your rehabilitation. Since you will no longer be in the hospital, arrangements will be made for someone to remove the sutures or skin clips about 10 days after surgery. It is not uncommon to still experience some pain. The full recovery period normally lasts three to six months.
Preparing To Go Home Just prior to your discharge, you will receive instructions for your at-home recovery. Until you see the surgeon for your follow-up visit, you must take certain activity precautions. As soon as you are home from the hospital, make an appointment to see the doctor. Look for any changes around your incision. Contact your surgeon if you develop any of the following:
1. Drainage and/or foul odor coming from the incision. Take time to adjust to your home environment. It is normal to feel frustrated, but these frustrations will soon pass. It is okay to take it easy. Resuming Activities Depending upon the physical demands of your job, you normally can resume work when authorized by your surgeon. You usually may begin driving once you are able to bear full weight on your knee. Be sure you are comfortable with your strength. Be sure to practice driving in a safe area. Once you are comfortable with your mobility, you generally may drive anywhere. Sexual intercourse may be resumed at any time as long as all knee precautions are kept in mind. We encourage you to be active in order to control your weight and muscle tone. It is generally three to four months before you can resume low-impact aerobic activity such as walking, golfing, bowling and swimming. Jogging, high-impact aerobics and contact sports are never allowed. Your new knee is artificial and although it is made of very durable materials, it is subject to wear and tear. Since your rehabilitation is an individual one, please seek advice on future activities from your surgeon.
Medication/Pain Control It is normal for you to have some discomfort. You will probably receive a prescription for pain medication before you go home. If a refill is needed, please call your surgeon's nurse at least five days before you run out of pills. Please contact your surgeon if you have increased discomfort or pain.
Special Instructions You may be seen six weeks, five months and twelve months after your surgery. It may be requested that you see your surgeon once a year after the first year, even if you are not having any problems. Any infection must be promptly treated with proper antibiotics because infection can spread from one area of the body to another through the blood stream. Every effort must be made to prevent infection in your artificial joint. You should always tell your dentist or physician that you have an artificial joint. If you are to have dental work performed, please call your surgeon prior to having this work done. Your surgeon will most likely prescribe an antibiotic for you. Antibiotics must be used before and after any medical or dental procedure. This precaution must be taken for the rest of your life. Patient education material provided by the American Academy of Orthopaedic Surgeons.
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