Knee replacement surgery is one of the most effective treatments for severe knee arthritis and joint damage. The procedure replaces damaged joint surfaces with artificial components designed to restore smooth movement and relieve pain. Most patients experience significant improvement in mobility and quality of life following knee replacement surgery.

However, in some cases the artificial joint may fail or complications may develop over time. A failed knee replacement occurs when the implant no longer functions properly or causes persistent symptoms such as pain, stiffness, or instability. When this occurs, further evaluation by an orthopedic specialist is necessary to determine the cause and identify the most appropriate treatment options.

Advances in orthopedic technology and surgical techniques allow many patients with failed knee replacements to undergo revision procedures that restore joint function and relieve pain.

What Is a Failed Knee Replacement?

A failed knee replacement occurs when the artificial knee joint no longer performs as intended. Knee implants are designed to replicate the natural movement of the knee and withstand many years of use. However, various factors can affect the longevity and performance of the implant.

Failure may occur shortly after surgery due to complications, or it may develop many years later as the implant components gradually wear down. Identifying the cause of failure is essential for determining the most effective treatment.

Common Causes

Several factors may contribute to a failed knee replacement.

Implant Loosening
Over time, the artificial components may loosen from the bone. This is one of the most common causes of knee replacement failure.

Implant Wear
The plastic or metal components of the implant can gradually wear down after years of use.

Infection
Infection around the joint replacement can damage tissues and compromise the implant.

Joint Instability
If the ligaments around the knee are not properly balanced, the joint may feel unstable or may give way.

Scar Tissue and Stiffness
Excess scar tissue can restrict joint motion and cause discomfort.

Malalignment
Improper positioning of the implant components can place abnormal forces on the joint.

Periprosthetic Fractures
Fractures around the knee implant may occur due to trauma or weakened bone.

Symptoms

Patients with a failed knee replacement may experience:

• Persistent or worsening knee pain
• Swelling or warmth around the joint
• Difficulty walking or standing
• Knee instability or giving way
• Reduced range of motion
• Clicking or mechanical symptoms within the joint

Any new or worsening symptoms following knee replacement surgery should be evaluated by an orthopedic specialist.

Diagnosis

Diagnosing a failed knee replacement involves several steps.

Medical History and Physical Examination
The orthopedic specialist will evaluate symptoms, mobility, swelling, and joint stability.

Imaging Studies
X-rays are used to assess implant alignment and detect loosening or fractures. CT scans may provide more detailed images when necessary.

Laboratory Tests
Blood tests may help determine whether infection is present.
Joint Aspiration
Fluid may be removed from the joint and analyzed to evaluate for infection.

Diagnosis

Diagnosing a failed knee replacement involves several steps.

Medical History and Physical Examination
The orthopedic specialist will evaluate symptoms, mobility, swelling, and joint stability.

Imaging Studies
X-rays are used to assess implant alignment and detect loosening or fractures. CT scans may provide more detailed images when necessary.

Laboratory Tests
Blood tests may help determine whether infection is present.
Joint Aspiration
Fluid may be removed from the joint and analyzed to evaluate for infection.

Treatment Options

Treatment depends on the cause of failure and the severity of symptoms.

Non-surgical treatment options may include:

• Physical therapy
• Anti-inflammatory medications
• Bracing
• Activity modification

If structural problems are present, revision knee replacement surgery may be recommended. Revision procedures replace part or all of the original implant and restore proper joint function.

At East Bay Orthopedic Specialists, you’ll be cared for by highly experienced surgeons including Dr. Michael Krosin, Dr. Steven Zourabian, and Dr. Virginia Lieu—trusted experts in knee replacement in the East Bay Area.

Schedule your consultation today to receive a personalized treatment plan and get back to pain-free movement as quickly as possible.