Knee replacement surgery is one of the most successful orthopedic procedures, helping millions of patients regain mobility and live with less pain. Modern knee implants can often last 15 to 25 years or longer. However, like any medical device, a knee replacement can occasionally develop complications that require additional treatment.

In some situations, the implant may need to be cleaned due to an infection, while in others, a revision knee replacement surgery may be necessary to repair or replace part or all of the artificial joint.

At JJ Aesthetics, we believe patients should understand the warning signs that indicate when medical evaluation is needed. Early diagnosis and treatment can often prevent more serious complications and improve long-term outcomes.

What Does It Mean to "Clean" a Knee Replacement?

When doctors refer to cleaning a knee replacement, they are usually talking about a procedure called debridement and irrigation.

This involves:

• Cleaning infected tissue around the implant
• Washing the joint thoroughly
• Removing bacteria and debris
• Preserving the existing implant when possible

This procedure is often considered when an infection is detected early.

What Is Revision Knee Replacement Surgery?

Revision knee replacement is a procedure in which part or all of the original implant is repaired, replaced, or reconstructed.

Revision surgery may be required due to:

• Implant loosening
• Infection
• Wear and tear
• Instability
• Fractures around the implant
• Mechanical failure

Revision procedures are generally more complex than primary knee replacement surgery.

Warning Signs That a Knee Replacement May Need Medical Attention

Persistent or Increasing Pain

One of the most common warning signs is pain that:

• Develops suddenly
• Continues to worsen
• Returns after years of good function
• Interferes with daily activities

While occasional discomfort can be normal, persistent pain should always be evaluated.

Swelling That Does Not Improve

Mild swelling may occur occasionally after activity.

However, significant or persistent swelling can indicate:

• Infection
• Implant loosening
• Inflammation
• Joint fluid accumulation

Swelling that worsens over time warrants medical assessment.

Redness Around the Knee

Redness may be a sign of:

• Infection
• Inflammation
• Soft tissue irritation

If redness is accompanied by warmth or pain, prompt evaluation is recommended.

Warmth Around the Joint

A knee replacement that becomes unusually warm compared to the opposite knee may indicate an underlying problem, particularly if symptoms appear suddenly.

Signs of Infection in a Knee Replacement

Infection is one of the most important reasons a knee replacement may require cleaning or revision surgery.

Fever

A persistent fever after the initial recovery period may suggest infection.

Drainage from the Incision

Any fluid leaking from the surgical site should be assessed promptly.

Possible drainage may include:

• Clear fluid
• Yellow fluid
• Pus-like discharge

Night Sweats or Chills

Systemic symptoms may indicate that infection is affecting the body beyond the knee joint.

Increasing Pain and Swelling

Pain that progressively worsens instead of improving is a common infection-related symptom.

Signs of Implant Loosening

Over time, the connection between the implant and the bone may weaken.

Pain During Weight-Bearing

Pain that occurs while standing or walking may suggest loosening.

Feeling That the Implant Is Moving

Some patients describe a sensation that the knee is shifting or moving abnormally.

Reduced Function

Activities that were once comfortable may become increasingly difficult.

Signs of Knee Instability

A stable knee replacement should feel secure during movement.

Potential warning signs include:

Buckling or Giving Way

The knee may suddenly feel unable to support body weight.

Difficulty Walking

Patients may notice:

• Unsteady movement
• Loss of confidence while walking
• Frequent stumbles

Abnormal Joint Movement

Unexpected movement patterns should be evaluated by an orthopedic specialist.

Stiffness That Continues to Worsen

Some stiffness is normal after surgery.

However, progressive stiffness months or years after recovery may indicate:

• Scar tissue formation
• Infection
• Implant-related problems

Reduced range of motion can significantly affect quality of life.

Unusual Noises from the Knee

Although occasional clicking may be normal, persistent mechanical sounds combined with pain or instability should be investigated.

Examples include:

• Grinding
• Clunking
• Popping sensations

These symptoms may indicate wear or mechanical issues.

Fractures Around the Implant

A fall or injury can cause fractures around the knee replacement.

Warning signs may include:

• Sudden severe pain
• Inability to bear weight
• Significant swelling
• Visible deformity

This situation requires immediate medical attention.

How Are Problems Diagnosed?

Orthopedic specialists may use several diagnostic tools.

Physical Examination

Assessment of:

• Pain location
• Stability
• Swelling
• Mobility

X-Rays

Imaging can help identify:

• Implant loosening
• Bone loss
• Alignment issues

Blood Tests

Blood tests may help detect infection or inflammation.

Joint Fluid Analysis

Fluid may be collected from the knee and tested for signs of infection.

Advanced Imaging

CT scans or other specialized studies may be ordered when necessary.

Can Revision Surgery Be Avoided?

In some cases, early treatment can prevent the need for major revision surgery.

Examples include:

Early Infection Treatment

Prompt diagnosis may allow cleaning procedures and antibiotic therapy before more extensive surgery becomes necessary.

Weight Management

Maintaining a healthy weight reduces stress on the implant.

Regular Follow-Up Appointments

Routine evaluations help identify issues before they become severe.

Fall Prevention

Avoiding injuries can protect both the implant and surrounding bone.

When Should You Contact Your Orthopedic Surgeon?

Seek medical advice if you experience:

• Increasing knee pain
• Persistent swelling
• Redness or warmth
• Fever
• Drainage from the incision
• Instability
• Difficulty walking
• Sudden changes in knee function

Early evaluation often leads to better outcomes.

Why Choose JJ Aesthetics?

At JJ Aesthetics, we are committed to helping patients understand every stage of their orthopedic journey—from initial treatment decisions to long-term implant care. Through expert guidance, patient education, and evidence-based healthcare information, we empower individuals to recognize potential problems early and seek timely medical attention.

Our goal is to support long-term mobility, comfort, and confidence through trusted orthopedic resources and personalized patient guidance.

Conclusion

Most knee replacements function successfully for many years, but complications can occasionally occur. Persistent pain, swelling, redness, warmth, instability, stiffness, drainage, or reduced function may indicate that a knee replacement requires further evaluation.

In some cases, early infections can be treated with cleaning procedures and antibiotics, while more significant issues may require revision knee replacement surgery. Recognizing warning signs early and consulting an orthopedic specialist promptly can help protect the implant and improve long-term outcomes.

If you're concerned about a knee replacement or would like expert guidance regarding joint replacement care and recovery, contact JJ Aesthetics today to learn more.