When Is the Right Time for Knee Replacement Surgery?

How do you know when the time is right? William R. Sterba, MD, is a joint replacement and adult reconstruction surgeon at Northwestern Medicine. He helps explain how to weigh your options.

Why Timing Matters

Knee replacement surgery, also called arthroplasty, can help reduce pain and stiffness, improve movement and help you return to daily activities — including the ones you enjoy most.

Getting the timing wrong, however, can affect your results:

• About 90% of patients wait too long, which can limit how much they improve.
• Around 25% have surgery too early, when benefits may be minimal.

“Quality of life is the most important factor when considering surgery,” says Dr. Sterba. “When pain and the limitations that come with arthritis affect your lifestyle, surgery can be an excellent option to improve your life.”

What Happens When You Wait Too Long?

Over time, damaged cartilage in the knee joint continues to break down. This can lead to:

• More pain and stiffness
• Swelling that limits movement
• Changes in how you walk, such as developing a bowlegged appearance
• Reduced range of motion

You may also start avoiding movement, which can make it harder to stay active.

“Less movement and more pain lead to greater immobility and can make people less active over time,” says Dr. Sterba. “As we know, staying active supports our overall health, and it’s good for our mind and spirit.” 

Waiting too long may also make it more difficult to regain full function, even after surgery, Dr. Sterba adds.

What Happens if You Have Surgery Too Early?

Getting a total knee replacement too soon also has downsides.

A knee replacement is a major surgical procedure. Even though techniques have improved — with some patients going home the same day — there are still risks, including:

• Infection
• Blood clots
• Complications that affect healing

If your symptoms are still mild, surgery may not significantly improve your pain management or movement.

Another concern is that artificial joints don’t last forever. If surgery happens too early, you may need another joint replacement surgery later in life. Revision surgeries are often more complex.

Are There Alternatives to Knee Replacement Surgery?

Joint preservation is a care approach that focuses on easing pain, improving function, and delaying or avoiding surgery when possible. It is often most effective in the earlier stages of arthritis or joint damage.

These options may include:

• Physical therapy to strengthen the muscles around the knee and improve stability
• Activity modification, such as reducing high-impact exercises and switching to low-impact activities like swimming or cycling
• Weight management to reduce stress on the knee joint
• Medications or injections to ease pain and improve function
• Bracing or orthotics to help support the joint and improve alignment

Minimally invasive procedures — such as arthroscopy or cartilage restoration techniques — may also be considered for certain patients.

The Northwestern Medicine Hip and Knee Joint Preservation Center was created to diagnose problems early, says Dr. Sterba. “At the center, we also help manage symptoms and use other options short of joint replacement. This approach can help prolong the life of the joint while preserving quality of life.”

Joint preservation is not a permanent solution for everyone. Over time, arthritis may continue to progress. However, these knee health strategies can help many people stay active, reduce pain and delay the need for joint replacement surgery.

5 Signs It May Be Time

How do you know when it’s time to consider joint replacement? Dr. Sterba recommends looking at several factors:

• Ongoing knee pain that limits daily activities
• Trouble walking, climbing stairs or standing
• Persistent pain and stiffness, even with treatment
• Reduced range of motion
• Imaging that shows severe cartilage damage

If you start giving up activities you enjoy or using more medication for pain management, it may be time to talk with your doctor or a joint replacement specialist.

The Role of Shared Decision-Making

There is no one-size-fits-all answer. That’s why experts emphasize a shared decision-making approach.

This means you and your care team work together to decide what’s best based on:

• Your symptoms and goals
• Your overall health
• Your lifestyle and activity level

Your doctor may also recommend options like physical therapy before surgery to improve strength and function.

After Knee Replacement: What To Expect

When done at the right time, total knee replacement can:

• Reduce pain
• Improve movement
• Help you stay active

Most patients take part in physical therapy after surgery to rebuild strength and improve range of motion. The goal is better long-term mobility and a higher quality of life.

“I tell my patients that the surgery is just the first step of the joint replacement journey,” says Dr. Sterba. “Working hard with physical therapy and overcoming the challenges of surgery are key parts of recovery. It helps the patient use their artificial knee as much as possible, which can lead to a fuller, more active and happier life.”   

Making the Right Move

The best time for surgery is when knee pain and symptoms begin to affect your daily activities and quality of life — but before your mobility declines too much.

If you are unsure, talk with your doctor about a shared decision-making plan. The right timing can make all the difference in helping you improve knee function and get back to what you love.

Learn more about your knee health with a knee pain assessment.