Knee Revision Surgery: Why Some Get a 2nd Replacement

Executive Summary

• While most knee replacements last about 15 to 20 years, some patients require a 2nd knee replacement on the same knee to preserve their mobility and quality of life.
• During knee revision surgery, surgeons remove some or all components of the original implant and clean and prepare the bone surfaces before replacing the implant with new components designed for stability and durability.
• Some of the most common reasons people need knee replacement revision surgery include implant loosening, wear and tear, improper alignment, and underlying conditions that affect joint health.
• If you notice early warning signs, such as increasing pain, persistent swelling, reduced mobility, or instability, promptly schedule a medical evaluation to prevent further damage.

Why Knee Revisions Sometimes Become Necessary

Total knee replacement surgery is one of the most successful orthopedic procedures, helping 790,000 Americans regain mobility and reduce chronic pain every year. Modern implants can last 15 to 20 years or longer, meaning many patients never need a 2nd knee replacement on the same knee. However, others might need their previously implanted artificial joint replaced or adjusted if it no longer functions properly.

Getting a 2nd knee replacement may be necessary if you have experienced degeneration or loosening from wear, complications such as infection or improper alignment, or changes in joint health. Moreover, many individual factors affect how long a knee replacement lasts, from activity level and weight to bone quality and overall health, making it important to discuss your likelihood of needing knee replacement revision surgery with your medical provider.

Nonetheless, this guide can help you tailor your expectations and catch warning signs. It also answers questions like, “Is a second knee replacement easier than the first?”

Top 4 Factors That Contribute to the Need for a Second Replacement

A 2nd knee replacement on the same knee is only recommended when the original implant fails to perform as expected. This can happen for a variety of mechanical, biological, and lifestyle-related reasons. The need for knee revision surgeries can often be traced back to one of the four factors below.

1. Implant-Related Issues

Even though artificial knee joints are designed to be durable, they are not indestructible. Therefore, components naturally wear down, especially in younger or more active patients. Some examples of common implant-related concerns are:

• Loosening – The implant may detach slightly from the bone, leading to pain and instability.
• Wear and tear – The plastic spacer between metal components can degrade over time. Since 60 to 70 years old is the average age for knee replacements, patients who live longer are more likely to need revision surgery. 
• Mechanical failure – Although it is rare, implant components can break or malfunction before reaching their typical lifespan.

2. Post-Surgical Complications

Complications following the initial surgery can also necessitate revision. Some examples of potential post-surgical problems include:

• Infection – The Centers for Disease Control and Prevention (CDC) estimates that 1-3% of patients develop surgical wound infections, which sometimes require implant removal.
• Stiffness – If you are still experiencing a severely limited range of motion that interferes with daily activities well after your recovery, revision surgery may be necessary.
• Improper alignment – If a surgeon poorly positions an implant, it can affect both function and longevity.

3. Biological and Health Factors

The body itself plays a significant role in how well a knee replacement holds up over time. Some biological and health-related factors that may increase the likelihood of knee revision surgery include:

• Chronic conditions, such as diabetes and other inflammatory diseases
• Poor bone quality or bone degeneration
• Participation in high-impact, joint-stressing activities

4. Surgical Technique and Rehabilitation

The success and longevity of a knee replacement also depend on surgical precision, making it essential to choose a trusted surgical team that uses cutting-edge technologies, such as Mako SmartRobotics™ and the CORI surgical system, to ensure proper alignment and implant positioning. 

Post-operative care is also key, as early rehabilitation contributes to long-term outcomes. Patients who follow their physical therapy plans and activity guidelines tend to experience better durability and function.

Recognizing Signs That Revision May Be Needed

Knowing when something isn’t right is key to protecting your joint health. While some discomfort is normal after knee replacement, ongoing or worsening symptoms may signal a problem. 

Look out for common warning signs like:

• Lingering or increasing pain that does not improve with rest or treatment
• Inflammation that continues beyond the normal recovery period
• Instability that makes you feel like your knee may give out
• Reduced range of motion or increasing stiffness over time
• Difficulty with daily activities, such as walking, climbing stairs, or standing

These symptoms don’t always mean a revision is necessary, but they do warrant further evaluation. So, if you are having trouble reducing swelling after knee surgery or you are encountering any of the other issues mentioned above, consult your medical provider as soon as possible.

An orthopedic specialist can carry out imaging studies, such as X-rays and MRIs, to assess the condition of the implant and surrounding structures. Early diagnosis can help identify minor issues before they progress into more serious complications.

The Knee Revision Surgery Process

If your prosthetic implant fails or causes significant symptoms, your medical provider may recommend a 2nd knee replacement on the same knee. Since everyone’s needs are unique, this can look different for each patient, but in general, a second knee replacement is not easier than the initial operation; revisions are more complex and require specialized expertise.

It is your doctor’s responsibility to tailor your expectations for your specific procedure and cover everything from the planned surgical approach to the pain medications you can take before surgery to provide temporary relief. Still, read through the considerations below to set a foundation.

What Happens During Revision Surgery?

Three of the most important steps a 2nd knee replacement typically involves are:

1. Removing some or all components of the original implant
2. Cleaning and preparing the bone surfaces
3. Replacing the implant with new components designed for stability and durability

In some cases, additional materials such as bone grafts or specialized implants may be used to address bone loss or structural changes.

Partial vs. Total Revision

The surgical approach for revisions depends on the specific issue the patient is facing. For example, sometimes only one component of the implant needs to be replaced, which is classified as a partial revision. In other situations, the entire knee prosthesis may need to be removed and replaced, necessitating a total revision.

Your surgeon will determine whether partial or total knee replacement is right for your second surgery based on imaging, symptoms, and overall joint condition.

Goals of Revision Surgery

Some of the primary goals of performing a 2nd knee replacement on the same knee include:

• Relieving pain
• Restoring joint function
• Improving stability and alignment
• Enhancing overall quality of life

Outcomes are generally positive, and this procedure helps many patients manage knee pain when walking up stairs and performing other everyday tasks. Still, expectations may differ slightly from the first surgery due to the procedure’s complexity.

Recovery After a Knee Revision

Recovery after a knee revision surgery can require even more care and consideration than what was asked of the patient during their first knee replacement. Take the following information into account as you prepare for recovery from your 2nd knee replacement on the same knee.

Is Second Knee Replacement Easier?

No, in most cases, a 2nd knee replacement is not necessarily easier. Since revision surgery is more complex, recovery may take longer and require more intensive rehabilitation. However, many patients still achieve significant pain relief and improved function.

What to Expect During Recovery

After a 2nd knee replacement, most aspects of recovery fall under these three categories:

1. Physical therapy – You will be given a structured exercise program to help rebuild strength and mobility. This is dire because knee revision patients may experience more swelling or stiffness compared to their first surgery.
2. Pain management – Your doctor will prescribe medications and recommend non-invasive strategies to manage pain immediately after surgery.
3. Mobility support – You may be asked to temporarily use a walker, cane, or crutches to ensure you can get around safely and efficiently.

Supporting the Healing Process

Some of the most noteworthy things you can do to promote a smoother recovery after your 2nd knee replacement are:

• Follow your rehabilitation plan closely
• Stay consistent with prescribed exercises
• Elevate and ice the knee as recommended
• Maintain a healthy diet without inflammatory foods
• Stay consistently hydrated

Patience is essential, as progress may be gradual. With time and effort, most patients regain meaningful improvements in function.

Preventing the Need for Future Revisions

While not all revision surgeries can be avoided, there are steps patients can take to extend the life of their initial knee replacement, such as:

• Adhere to rehabilitation protocols – Completing physical therapy can enhance long-term joint health by helping you maintain strength and joint stability.
• Attend routine follow-ups – Scheduling regular check-ups with your orthopedic surgeon can help you detect potential issues early and address minor concerns before they require extensive interventions.
• Maintain a healthy weight – Excess body weight can impact joint health by placing additional stress on the knee, potentially accelerating wear on the implant.
• Protect the joint – Avoid high-impact activities that can strain the knee, such as running or jumping. Instead, focus on low-impact exercises for joint health, such as walking, swimming, and cycling.

Regaining Strength and Mobility

Although the idea of a 2nd knee replacement on the same knee can feel daunting, it’s important to remember that revision surgery is designed to restore function and improve quality of life. While recovery may require more time and dedication, the long-term benefits of joint surgeries like this can be substantial. Many patients experience significant pain relief and regain the ability to perform daily activities.

So, if you are experiencing persistent knee pain, instability, or changes in mobility after already receiving a knee replacement, the team at the Joint Replacement Center of Scottsdale can help. Since we use advanced robotic technology to ensure precision, performing a second knee replacement is easier for our surgeons than for those reliant on more traditional methods.

Contact us today to schedule a consultation. We are excited to shed more light on your options for restoring strength, stability, and confidence in your movement.