Dr Sumit Mahajan
When is the right time to undergo a knee replacement?
There is no specific answer to this question. But if you are having difficulty getting up, going to washroom, change in walking pattern, pain while walking for very short distances and worsening of daily activities, is the time, where you should go for joint replacment. A thorough examination by an orthopedic surgeon should yield a recommendation.
Is there a way to avoid surgery?
For some, lifestyle modifications, physical therapy, medication can help manage knee problems. Also, you may want to speak to your surgeon about other procedures that are commonly recommended before resorting to knee replacement surgery, including hyaluronic acid injections and arthroscopic surgery that addresses the damaged cartilage. However, delaying or declining a necessary knee replacement could result in a less favorable outcome. Ask yourself: Have I tried everything? Is my knee holding me back from doing the things I enjoy?
What will occur during surgery and how long will the knee replacement operation take?
The surgeon will make an incision on the top of your knee in order to expose the damaged area of your joint. The standard incision size can be as long as 10 inches, but a minimally invasive procedure can result in incisions as short as 6 inches. During the operation, the surgeon moves your kneecap aside and cuts away damaged bone and cartilage, which are then replaced with new metal and plastic components. The components combine to form a synthetic (but biologically compatible) joint that mimics the movement of your natural knee. Most knee replacement procedures take 30min – 1 hour to complete.
What pieces are used in a knee replacement and how are they kept in place?
Implants are comprised of metal and medical-grade plastic. To seal these components to your bone, two methods are used: bone cement, which typically takes about 7-8 minutes to set.
Should I be concerned about anesthesia during surgery?
Any surgery with anesthesia has risks. However, complication rates and mortality for general anesthesia are extremely low. An anesthesia team will determine whether general anesthesia or spinal, epidural, or regional nerve block anesthesia is best. So, before going in for surgery, it is important to get the medical fitness first.
How much pain will I experience after surgery?
Although you will experience some pain after surgery, it should diminish quickly-within four or five days max. Your doctor will most likely prescribe medication to help you manage the pain, which will be administered through intravenously (IV) immediately after surgery. After you are released from the hospital, you will switch to painkillers taken in a pill or tablet form. Your willingness to engage in physical therapy and make lifestyle modifications can have a significant impact on your post-surgery level of pain and adjustment to the implant.
What should I expect immediately following surgery?
You will wake up with a bandage over your knee and, in most cases, a drain to remove fluid from the joint. It is likely that you will wake up with your knee elevated. A doctor might also insert a catheter so you don’t have to get out of bed to get to a toilet. Your doctor will administer antibiotics intravenously and you may receive blood thinners to reduce the odds of a clot.
What can I expect during recovery and rehabilitation from knee replacement?
Most patients are up and walking within a day or two-with the aid of a walker or crutches. A physical therapist will help you bend and straighten your knee a few hours after your surgery. After you return home, therapy will continue regularly for weeks and you will be asked to engage in specific exercises designed to improve the functionality of the knee. During the weeks after surgery, your doctor will wean you from pain medication.
What do I need to do to prepare my home for recovery?
If you live in a multiple story house, prepare a bed and space on the ground floor so that you can avoid the stairs when you first return. Make sure the house is free of obstructions and hazards including power cords, area rugs, clutter, and furniture. Focus specially on pathways, hallways, and other places where you are likely to have to walk through. You may want to add a hand shower and English toilet seat.
Will I require any special equipment?
Your doctor will prescribe mobility equipment that you need, like a walker and commode chair.
What activities will I be able to engage in?
You should be able to resume normal daily activities-such as walking and bathing-within several days. Low impact exercise should also be doable after your rehabilitation period, typically six to 12 weeks. Consult with your physical therapist about introducing new activities during this rehabilitation period. You should avoid running, jumping and other high impact activities. You can do activities like driving, morning walks and playing golf after 6-8 weeks after surgery.
How long will the artificial knee joint last and will I ever require a revision (a second knee replacement)?
Studies show that upwards of 85 percent of patients still have a functioning artificial joint 20 years after receiving it. However, wear and tear on the joint can adversely affect its performance and lifespan. Younger patients are more likely to have the joint wear out and require a revision during their lifetime. Consult with a doctor about what’s right for you.
(The author is Joint Replacement & Arthroscopy Surgeon)
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