Knee replacement surgery replaces the damaged surfaces of the knee with implants to relieve pain and restore movement, and it is usually advised when arthritis has not improved with other treatment. This guide answers common questions about when to consider surgery, the best age, total versus partial replacement, how long implants last, how successful the operation is and what the risks are. It is general information from the practice of Dr. Sushil Sharma, a joint replacement surgeon at Kailash Hospital & Heart Institute, Noida.

In This Guide

What is knee replacement surgery?
When should I consider knee replacement?
What is the best age for knee replacement, and is there an age limit?
What is the difference between total and partial knee replacement?
Who is a good candidate for partial knee replacement?
How long does a knee replacement last?
Is knee replacement 100% successful?
Can both knees be replaced at the same time?
What are the risks of knee replacement?

What is knee replacement surgery?

Knee replacement surgery replaces the worn or damaged surfaces of the knee joint with metal and medical-grade plastic implants to relieve pain and improve movement. It can be a total replacement or, in selected cases, a partial one. It is usually advised when arthritis has damaged the joint and other treatments no longer help.

When should I consider knee replacement?

Consider it when knee pain from arthritis, most often osteoarthritis, continues despite medicines, physiotherapy, weight management and injections, and it limits walking, climbing stairs, sleep or daily work. Your X-rays and examination show how much damage there is. Surgery is not always the first step, and the decision is made together with your surgeon.

What is the best age for knee replacement, and is there an age limit?

There is no single best age. Most knee replacements are done between about 50 and 80 years of age, but the timing depends on how much pain and stiffness you have and how damaged the joint is, not on your age alone. Younger patients need careful planning because implants wear over time, and older patients often do very well when they are medically fit.

What is the difference between total and partial knee replacement?

A total knee replacement resurfaces the whole joint. A partial knee replacement replaces only the damaged part of the knee, and it suits patients whose arthritis is limited to one area and whose ligaments are healthy. X-rays and an examination show which option is suitable. Dr. Sharma performs both, including with robotic assistance.

Who is a good candidate for partial knee replacement?

Partial knee replacement is considered when arthritis is limited to one part of the knee, usually the inner side, the ligaments (especially the ACL) are intact, the knee is not badly stiff or deformed, and the pain comes mainly from the arthritic area. It is less suitable with widespread arthritis, inflammatory arthritis such as rheumatoid arthritis, or a knee that is unstable. X-rays, sometimes an MRI, and an examination decide. A partial replacement can mean quicker recovery, but it may need to be converted to a total replacement later if arthritis spreads.

How long does a knee replacement last?

Modern knee implants often last 15 to 20 years or more, but there is no guarantee. How long yours lasts depends on your weight, activity level, bone quality, the implant used and how accurately it is positioned. Regular follow-up lets your surgeon pick up wear early.

Is knee replacement 100% successful?

No operation is 100% successful. Most patients get major relief from pain and better movement, and in many studies roughly 8 or 9 out of 10 are satisfied. A smaller group continues to have some pain or stiffness, and a few need further treatment. Results are best when the patient is well prepared, the implant is positioned accurately and rehabilitation is completed. Ask your surgeon what to expect for your own knee.

Can both knees be replaced at the same time?

In suitable patients, both knees can be replaced during one admission. This depends on your heart, lungs and general fitness, and your surgeon will assess you first. If same-sitting surgery is not right for you, the knees can be done in two stages a few months apart.

What are the risks of knee replacement?

As with any major surgery, risks include infection, blood clots, stiffness, persistent pain, problems with the implant over time and anaesthesia-related complications. Most patients do well, and careful preparation, blood-clot prevention and rehabilitation lower the risks. Your surgeon should explain the risks that apply to you before you decide.

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Still Have a Question?

If your question is not answered here, ask Dr. Sharma at your consultation. To book at Kailash Hospital & Heart Institute, Sector 27, Noida, call +91 9873114480 or 9810894321, or use our contact page.

This page gives general information only and does not replace medical advice. In an emergency, go to your nearest emergency department.

About the Author: Dr. Sushil Sharma

Sr. Consultant, Joint & Knee Replacement Surgeon, Kailash Hospital & Heart Institute, Sector 27, Noida.
MBBS, D.O. (Ortho), MCh (Ortho), FJRS (Swiss) | 38+ years of experience | 10,000+ joint replacements | Author of “Defeat Osteoporosis”.
Knee replacement surgeon in Noida

Knee Replacement Surgery Explained: Age, Success, Risks and Types