The Knee |
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Friday, 23 October 2009 01:08 | |||
The knee is an important part of your lower extremity. It provides adequate motion to permit you to sit and stand. It is a magnificent shock absorber, absorbing as much as three to four times your body weight whenever you walk or jog. All of these are due to the cartilage that lines the ends of the bones. The knee joint is made up of the articulations between the end of the thigh bone (femur), the end of the leg bone (tibia), and the undersurface of the kneecap (patella). These surfaces are covered with cartilage, a very smooth and hard structure that provides good shock absorption and an almost frictionless bearing surface. When a person develops arthritis, cartilage is damaged. As the damage progresses, shock absorption capacity lessens and the almost frictionless surface starts to become rough. When these happen, the knee starts to swell, stiffen, deform, and hurt. The more damage that the knee sustains, the worse the symptoms will be. Do I Need A Knee Replacement ? What Can I Expect After Surgery ? What Are The Risks of the Procedure? By carefully following the instructions of your doctor, you will be able to lessen the risks of surgery. Furthermore, your physicians at AOJR have trained long and hard in various centers abroad in order to minimize the chances of these potential complications occurring. HOW DO I PREPARE FOR SURGERY? Laboratory examination: We would request for certain blood exams to make sure that you do not have problems such as anemia or an infection. A urine exam would also be requested. Any existing infection should be treated prior to the surgery. Medical evaluation: We would give you a referral to a cardiologist or an internist. He would normally request for other tests, such as an electrocardiogram (ECG) and a chest x-ray. He will make sure that you are fit to undergo the surgery. If you have other underlying illnesses, such as diabetes, prostate problems, or rheumatoid arthritis, we would likewise refer you to the appropriate specialist if necessary. Ideally, the physicians who give your clearances should come from the same hospital where you plan to have the surgery. This would decrease the chances of problems arising should their help be required during your hospital stay. Dental evaluation: One often overlooked source of possible infection after a knee replacement is the teeth. In order to lessen the chances of infection from this source, we will request you to have your teeth and mouth examined by your dentist. If everything is fine, he should give us a written clearance to that effect. Otherwise, if there are dental problems that have to be treated, these should be addressed first prior to having your surgery. Medications: It is important to inform your doctor what medications you take. Some medications, such as “baby aspirin” (low dose aspirin often given to patients with problems of the blood vessels of the heart) should be discontinued about a week prior to the surgery.
Smoking increases the risk of developing a wound problem after surgery. We would strongly advise you to stop smoking a week before surgery, and to continue to refrain from smoking for the next few weeks after surgery. Companions: Although you should be able to move around with a walker or a cane immediately after surgery, we would advise you to have a companion to help you for the next few weeks. ADMISSION AND SURGERY You have to fast (no food or drinks, even water, by mouth) at least eight hours before your scheduled surgery.
About one hour before the planned procedure, the transport team will come and bring you to the operating room. If you have companions that decide to follow you to the operating room, they will not be allowed to enter the operating room itself due to patient safety issues. Once inside the operating room, the anesthesiologist will administer the anesthetics to you. You will then be positioned for the surgery, and the procedure will commence after ascertaining that you are the correct patient and that we are operating on the correct limb. The surgery may last from one and a half to two hours. For more difficult cases, it might last longer. A tourniquet is often applied on the upper part of the thigh in order to prevent excessive bleeding from the wound. At times, patients may feel a discomfort over this part of the thigh after surgery, and this is often due to the pressure exerted by the tourniquet on this part when it was inflated. During surgery, only the ends of the bones are replaced. The alignment of the knee is brought back to normal and the motion of the knee is improved. There are several implants in the market manufactured by different companies. Often, your surgeon will use the one that is most appropriate for you and the one that he is most comfortable with. After surgery, you will be brought to the recovery room. Your stay there may be anywhere from one hour to a few hours, depending on how fast you recover from the anesthetics. Thus, the total amount of time that you could be away from your room would be about 5 – 8 hours, depending mainly on how long you will stay in the recovery room. AFTER SURGERY
Some surgeons will put your operated limb on a device called a CPM, or continuous passive motion machine. This device slowly moves your knee from a fully straightened position to a bent position. Studies have shown that in the long run, there is no beneficial effect of this machine on knee motion when compared with physical therapy. The next day after your surgery, a rehabilitation medicine physician or a physical therapist may visit you. He/She will go over the proposed treatment plan that you will be doing. Physical therapy often starts on the day after surgery. If you were operated on in the evening, it would start on the morning of the second day after surgery. Therapy would consist of muscle strengthening, improvement of knee motion, and ambulation (walking) training. The drains from the operative site are removed on the first or second day after surgery. The urinary catheter is also removed at about the same time. The intravenous lines are kept in place, usually to serve as a route for administration of antibiotics, pain relievers, or even blood (blood transfusion). Once these are not needed, the lines are removed. The length of your hospital stay is dependent on several factors, including: presence or absence of other medical problems, condition of the surgical wound, progress of rehabilitation, and many others. In general, however, patients stay in the hospital for an average of five days. PAIN CONTROL OTHER MEDICATIONS GOING HOME Before you are discharged from the hospital, you will be instructed by your physician and your nurse on several things, including: wound care, medications, and activities. The wound has to be cleaned as instructed and demonstrated to you while you were admitted. Some surgeons prefer to have you clean the wound daily, while others would prefer less frequent dressing changes. The wound should not get wet until it has thoroughly dried. Most physicians wait until the skin sutures or staples are removed before allowing the area to get wet. Home medications would be prescribed. They should be taken as instructed by your physician, the nurse, or the hospital pharmacist. The anti-thrombotic stockings that you will be asked to use in order to decrease the risk of a blood clot developing in your legs should be worn for at least six weeks. Regular physical therapy is important. Before going home, make sure that you have spoken with your physical therapist regarding outpatient therapy. Regularly do the exercises that were taught to you while you were admitted. They are important in improving your knee motion and strength. You will be allowed to go home when the wounds are dry, when you do not have a fever, and when you can move in and out of the bed with minimal assistance. Once walking strength and confidence have returned, you would be encouraged to move about more frequently. Not only will regular activities improve muscle strength, this will also lessen the risk of forming blood clots in the legs. Initially, you will have to use a walker or a pair of crutches in order to move around. But as you get stronger and your sense of balance returns, you will eventually be able to move about without the use of any assistive device. AVOIDING PROBLEMS If you notice any of the following signs or symptoms, please let us know as soon as possible.
These are some of the warning signs that you may be developing a problem. Prompt treatment would lessen the chances of this getting worse. ACTIVITIES AFTER SURGERY
Article by Jose Fernando Syquia, M.D.
Advanced Orthopedics for Joint Replacement
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