You may want to have a say in this decision, or you may simply want to follow your doctor's recommendation. Either way, this information will help you understand what your choices are so that you can talk to your doctor about them.
Arthritis: Should I Have Knee Replacement Surgery?
Get the facts
Osteoarthritis is a problem with the cartilage in joints. Over time, the cartilage breaks down until the bones, which were once separated by cartilage, rub against each other. This causes damage to tissue and bone. The symptoms of osteoarthritis include joint pain, stiffness after inactivity, and limited motion.
Knee replacement surgery may be used when there is knee pain and disability from damage that can be seen on X-rays.
The surgeon covers the ends of the damaged thighbone and lower leg bone, and usually the kneecap, with artificial (man-made) surfaces that are lined with metal and plastic. The artificial pieces are cemented to the bones.
Rehabilitation, or rehab, is usually intense after surgery. Most people start to walk with a walker or crutches the day after surgery and begin physical therapy right away. Your doctor may advise you to ride a stationary bike to strengthen your leg muscles and improve how well you can bend your knee. Rehab will take several weeks, but you should be able to start walking, climbing stairs, sitting in and getting up from chairs, and doing other daily activities within a few days.
Surgery is only for people with severe osteoarthritis who do not get pain relief from medicine, home treatment, or other methods and who have lost a lot of cartilage. Surgery relieves severe, disabling pain and may restore the knee's ability to work properly.
Besides knee replacement, the other types of surgeries used are:
|
Arthroscopy |
This surgery can provide short-term relief of symptoms. Sometimes the relief lasts a long time. It can also fix a knee that becomes "locked" or stuck because of loose cartilage or bone fragments. |
|
Osteotomy |
This surgery corrects knee problems such as bowleg and knock-knee. It is usually done for younger, active people who have mild arthritis and who want to delay knee replacement. |
|
Arthrodesis |
This is surgery that joins (fuses) two bones in a diseased joint so that the joint can no longer move. It is rarely used in the knees, but it may be a treatment choice in cases of severe osteoarthritis in a young person who cannot have total knee replacement. |
There are a number of treatments for arthritis in the knee that don't involve surgery:
Most people have much less pain after knee replacement surgery and are able to return to many of their activities. But as with any surgery, there are some risks, including:
| Outcomes after surgery | Number of people |
|---|---|
| People who are satisfied with their pain level 1 year after surgery | 71 to 85 out of 100 (710 to 850 out of 1,000) |
| People who are satisfied overall 2 to 17 years surgery | 82 out of 100 (820 out of 1,000) |
| Need for repeat surgery within 15 years | 12 out of 100 (120 out of 1,000) |
| Serious joint infection within 10 years after surgery | 1 out of 100 (10 out of 1,000) |
| Death within 4 to 6 weeks after surgery | Less than 1 out of 100 (2 to 6 out of 1,000) |
*Based on the best available evidence (evidence quality: moderate to high)
The evidence about knee replacement surgery suggests that most people are happy with the results. The quality of this evidence is moderate.
Take a group of 100 people who have the surgery.
Most artificial knees last for many years. But they can wear out or have other problems. Some people have to repeat the surgery to have the joint replaced again. The quality of the evidence about the need for repeat surgery is high.
Take a group of 100 people who have the surgery. Within 15 years after surgery, 12 out of 100 will need to have the knee replaced again. This means that 88 out of 100 will not need to repeat the surgery within the first 15 years.
The evidence suggests that, like most surgeries, knee replacement may have some risks. The quality of this evidence is moderate to high.
Take a group of 1,000 people who have the surgery. Rare but serious problems that can occur include:
Some evidence is better than other evidence. Evidence comes from studies that look at how well treatments and tests work and how safe they are. For many reasons, some studies are more reliable than others. The better the evidence is—the higher its quality—the more we can trust it.
The information shown here is based on the best available evidence.1, 2, 3, 4, 5 The evidence is rated using four quality levels: high, moderate, borderline, and inconclusive.
Another thing to understand is that the evidence can't predict what's going to happen in your case. When evidence tells us that 2 out of 100 people who have a certain test or treatment may have a certain result and that 98 out of 100 may not, there's no way to know if you will be one of the 2 or one of the 98.
Your doctor might recommend knee replacement if:
Compare your options
Compare
What is usually involved? |
| |
What are the benefits? |
| |
What are the risks and side effects? |
|
Personal stories
Are you interested in what others decided to do? Many people have faced this decision. These personal stories may help you decide.
These stories are based on information gathered from health professionals and consumers. They may be helpful as you make important health decisions.
I've skied competitively since I was 6 years old. In my 20s, I had several knee injuries and surgeries. About 7 years ago, I started having a lot of pain in one knee, and my doctor said the only surgery left to do was to replace the knee. If I have the knee replaced, I won't be able to ski or run or do anything that puts a lot of stress on it. I can't do any of those things now because of the pain anyway. I don't know how I'm going to deal with that, since being an athlete has always been a big part of who I am. I'm worried about having my knee replaced when I'm so young, but with the amount of pain I'm having, I don't see any other choice.
Chuck, age 45
The pain in my knees, especially my left one, has gotten steadily worse in the last 20 years. The medicines just weren't working. It got so bad last year that I gave up on my flower garden. My doctor and I discussed knee replacement, but I consider that my last resort. My doctor and I developed a plan of swimming and healthy eating habits that will help me take off these extra weight I've put on. We agree that's the best thing I can do to keep my osteoarthritis from getting worse. We're going to try some different medicines too.
Esmerelda, age 61
I feel like I'm too young to have my knee replaced. But I definitely need something other than Tylenol for the pain. I asked my doctor about my other options. She said we can try joint injections and see how that works. I can always have the surgery later if I need it, but I'd sure like to put it off for as long as I can. I'll see if these joint injections make the pain better. My doctor says that as long as I can handle the pain, we can hold off on the surgery.
George, age 57
I was an avid tennis player for years, and it finally caught up with my knees. I had an osteotomy years ago, and it helped for a while. But now so much of my time is focused on the pain. I'm an active grandmother with no intention of missing out on my grandkids' activities. I know that surgery will mean a long period of exercising and rehabilitation, but it will be worth it to lose this stiffness and discomfort.
Jean, age 71
What matters most to you?
Your personal feelings are just as important as the medical facts. Think about what matters most to you in this decision, and show how you feel about the following statements.
Reasons to have knee replacement surgery
Reasons not to have knee replacement surgery
I want to be able to do low-impact activities, such as swimming and golf, as well as chores and housework.
My knee doesn't really get in the way of the physical activities I like or need to do.
I have more bad days than good.
I have more good days than bad.
I'm not worried about the chance of needing another replacement surgery later in life.
I'm worried about needing another surgery in 10 or 20 years.
I'm ready and willing to do several weeks of physical therapy after the surgery.
I don't want, or I won't be able, to have several weeks of physical therapy.
I know that problems sometimes occur with surgery, but getting pain relief and getting back some use of my knee is worth the risk.
I'm very worried about problems from surgery.
My other important reasons:
My other important reasons:
Where are you leaning now?
Now that you've thought about the facts and your feelings, you may have a general idea of where you stand on this decision. Show which way you are leaning right now.
Having knee replacement surgery
NOT having knee replacement
What else do you need to make your decision?
Check the facts
Knee replacement surgery should be my first choice if I have osteoarthritis of the knee.
I will be able to return to all my normal activities right after I have this surgery.
Although most surgeries last for at least 15 years, I may need to have my knee replaced again.
Decide what's next
Do you understand the options available to you?
Are you clear about which benefits and side effects matter most to you?
Do you have enough support and advice from others to make a choice?
Certainty
How sure do you feel right now about your decision?
Check what you need to do before you make this decision.
Use the following space to list questions, concerns, and next steps.
Your Summary
Here's a record of your answers. You can use it to talk with your doctor or loved ones about your decision.
Next steps
Which way you're leaning
How sure you are
Your comments
Key concepts that you understood
Key concepts that may need review
Patient choices
| Credits | Healthwise Staff |
|---|---|
| Primary Medical Reviewer | Anne C. Poinier, MD - Internal Medicine |
| Specialist Medical Reviewer | Stanford M. Shoor, MD - Rheumatology |
Osteoarthritis is a problem with the cartilage in joints. Over time, the cartilage breaks down until the bones, which were once separated by cartilage, rub against each other. This causes damage to tissue and bone. The symptoms of osteoarthritis include joint pain, stiffness after inactivity, and limited motion.
Knee replacement surgery may be used when there is knee pain and disability from damage that can be seen on X-rays.
The surgeon covers the ends of the damaged thighbone and lower leg bone, and usually the kneecap, with artificial (man-made) surfaces that are lined with metal and plastic. The artificial pieces are cemented to the bones.
Rehabilitation, or rehab, is usually intense after surgery. Most people start to walk with a walker or crutches the day after surgery and begin physical therapy right away. Your doctor may advise you to ride a stationary bike to strengthen your leg muscles and improve how well you can bend your knee. Rehab will take several weeks, but you should be able to start walking, climbing stairs, sitting in and getting up from chairs, and doing other daily activities within a few days.
Surgery is only for people with severe osteoarthritis who do not get pain relief from medicine, home treatment, or other methods and who have lost a lot of cartilage. Surgery relieves severe, disabling pain and may restore the knee's ability to work properly.
Besides knee replacement, the other types of surgeries used are:
|
Arthroscopy |
This surgery can provide short-term relief of symptoms. Sometimes the relief lasts a long time. It can also fix a knee that becomes "locked" or stuck because of loose cartilage or bone fragments. |
|
Osteotomy |
This surgery corrects knee problems such as bowleg and knock-knee. It is usually done for younger, active people who have mild arthritis and who want to delay knee replacement. |
|
Arthrodesis |
This is surgery that joins (fuses) two bones in a diseased joint so that the joint can no longer move. It is rarely used in the knees, but it may be a treatment choice in cases of severe osteoarthritis in a young person who cannot have total knee replacement. |
There are a number of treatments for arthritis in the knee that don't involve surgery:
Most people have much less pain after knee replacement surgery and are able to return to many of their activities. But as with any surgery, there are some risks, including:
| Outcomes after surgery | Number of people |
|---|---|
| People who are satisfied with their pain level 1 year after surgery | 71 to 85 out of 100 (710 to 850 out of 1,000) |
| People who are satisfied overall 2 to 17 years surgery | 82 out of 100 (820 out of 1,000) |
| Need for repeat surgery within 15 years | 12 out of 100 (120 out of 1,000) |
| Serious joint infection within 10 years after surgery | 1 out of 100 (10 out of 1,000) |
| Death within 4 to 6 weeks after surgery | Less than 1 out of 100 (2 to 6 out of 1,000) |
*Based on the best available evidence (evidence quality: moderate to high)
The evidence about knee replacement surgery suggests that most people are happy with the results. The quality of this evidence is moderate.
Take a group of 100 people who have the surgery .
Most artificial knees last for many years. But they can wear out or have other problems. Some people have to repeat the surgery to have the joint replaced again. The quality of the evidence about the need for repeat surgery is high.
Take a group of 100 people who have the surgery . Within 15 years after surgery, 12 out of 100 will need to have the knee replaced again. This means that 88 out of 100 will not need to repeat the surgery within the first 15 years.
The evidence suggests that, like most surgeries, knee replacement may have some risks. The quality of this evidence is moderate to high.
Take a group of 1,000 people who have the surgery . Rare but serious problems that can occur include:
Some evidence is better than other evidence. Evidence comes from studies that look at how well treatments and tests work and how safe they are. For many reasons, some studies are more reliable than others. The better the evidence is—the higher its quality—the more we can trust it.
The information shown here is based on the best available evidence.1, 2, 3, 4, 5 The evidence is rated using four quality levels: high, moderate, borderline, and inconclusive.
Another thing to understand is that the evidence can't predict what's going to happen in your case. When evidence tells us that 2 out of 100 people who have a certain test or treatment may have a certain result and that 98 out of 100 may not, there's no way to know if you will be one of the 2 or one of the 98.
Your doctor might recommend knee replacement if:
| Have knee replacement surgery | Try other treatment | |
|---|---|---|
| What is usually involved? |
|
|
| What are the benefits? |
|
|
| What are the risks and side effects? |
|
|
Are you interested in what others decided to do? Many people have faced this decision. These personal stories may help you decide.
These stories are based on information gathered from health professionals and consumers. They may be helpful as you make important health decisions.
"I've skied competitively since I was 6 years old. In my 20s, I had several knee injuries and surgeries. About 7 years ago, I started having a lot of pain in one knee, and my doctor said the only surgery left to do was to replace the knee. If I have the knee replaced, I won't be able to ski or run or do anything that puts a lot of stress on it. I can't do any of those things now because of the pain anyway. I don't know how I'm going to deal with that, since being an athlete has always been a big part of who I am. I'm worried about having my knee replaced when I'm so young, but with the amount of pain I'm having, I don't see any other choice."
— Chuck, age 45
"The pain in my knees, especially my left one, has gotten steadily worse in the last 20 years. The medicines just weren't working. It got so bad last year that I gave up on my flower garden. My doctor and I discussed knee replacement, but I consider that my last resort. My doctor and I developed a plan of swimming and healthy eating habits that will help me take off these extra weight I've put on. We agree that's the best thing I can do to keep my osteoarthritis from getting worse. We're going to try some different medicines too."
— Esmerelda, age 61
"I feel like I'm too young to have my knee replaced. But I definitely need something other than Tylenol for the pain. I asked my doctor about my other options. She said we can try joint injections and see how that works. I can always have the surgery later if I need it, but I'd sure like to put it off for as long as I can. I'll see if these joint injections make the pain better. My doctor says that as long as I can handle the pain, we can hold off on the surgery."
— George, age 57
"I was an avid tennis player for years, and it finally caught up with my knees. I had an osteotomy years ago, and it helped for a while. But now so much of my time is focused on the pain. I'm an active grandmother with no intention of missing out on my grandkids' activities. I know that surgery will mean a long period of exercising and rehabilitation, but it will be worth it to lose this stiffness and discomfort."
— Jean, age 71
Your personal feelings are just as important as the medical facts. Think about what matters most to you in this decision, and show how you feel about the following statements.
Reasons to have knee replacement surgery
Reasons not to have knee replacement surgery
I want to be able to do low-impact activities, such as swimming and golf, as well as chores and housework.
My knee doesn't really get in the way of the physical activities I like or need to do.
I have more bad days than good.
I have more good days than bad.
I'm not worried about the chance of needing another replacement surgery later in life.
I'm worried about needing another surgery in 10 or 20 years.
I'm ready and willing to do several weeks of physical therapy after the surgery.
I don't want, or I won't be able, to have several weeks of physical therapy.
I know that problems sometimes occur with surgery, but getting pain relief and getting back some use of my knee is worth the risk.
I'm very worried about problems from surgery.
My other important reasons:
My other important reasons:
Now that you've thought about the facts and your feelings, you may have a general idea of where you stand on this decision. Show which way you are leaning right now.
Having knee replacement surgery
NOT having knee replacement
1. Knee replacement surgery should be my first choice if I have osteoarthritis of the knee.
2. I will be able to return to all my normal activities right after I have this surgery.
3. Although most surgeries last for at least 15 years, I may need to have my knee replaced again.
1. Do you understand the options available to you?
2. Are you clear about which benefits and side effects matter most to you?
3. Do you have enough support and advice from others to make a choice?
1. How sure do you feel right now about your decision?
2. Check what you need to do before you make this decision.
3. Use the following space to list questions, concerns, and next steps.
| By | Healthwise Staff |
|---|---|
| Primary Medical Reviewer | Anne C. Poinier, MD - Internal Medicine |
| Specialist Medical Reviewer | Stanford M. Shoor, MD - Rheumatology |
Last Revised: April 8, 2011
Author: Healthwise Staff
Medical Review: Anne C. Poinier, MD - Internal Medicine & Stanford M. Shoor, MD - Rheumatology