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What is revision knee replacement?
Revision knee replacement means removing and replacing some or all parts of an existing knee implant. It is usually more complex than the first operation because bone may have been lost and scar tissue is present. Special implants, bone grafts or longer stems may be needed. Planning is tailored to the reason for revision.
Common reasons for revision
- Infection: bacteria can infect the joint early after surgery or years later, sometimes spreading from elsewhere in the body. Treatment often involves surgery, and sometimes a two-stage revision.
- Loosening: the bond between the implant and bone can weaken over time, causing pain.
- Instability: the knee may feel wobbly or give way if the soft tissues are unbalanced or the parts are mispositioned.
- Wear: the plastic insert can wear, and wear particles can lead to bone loss (osteolysis).
- Fracture of the bone around the implant, usually after a fall.
- Stiffness that does not respond to physiotherapy or other treatment.
After a partial knee replacement, arthritis progressing in another compartment is another reason for revision to a total replacement.
What are the warning signs?
Contact your surgeon if you notice:
- New or increasing pain, especially pain that develops after a period of comfort.
- Pain at rest or at night.
- Swelling that keeps returning.
- A feeling that the knee is unstable or giving way.
- Loss of movement, or a knee that is becoming stiffer.
- Redness, warmth, wound discharge or fever.
Some ache and swelling are normal during the first months of recovery after knee replacement, so changes are judged against your expected progress.
How is a painful knee replacement evaluated?
A painful knee replacement needs careful investigation to find the cause before any decision on surgery. Evaluation typically includes:
- A detailed history and examination, including the hip and spine, which can cause referred pain.
- X-rays compared with earlier images to look for loosening, wear, position problems or fracture.
- Blood tests for markers of infection and inflammation.
- Aspiration of fluid from the joint in a sterile setting when infection is suspected.
- Further scans in selected cases.
Revision is not done for pain alone without a clear cause, because it may not help.
What does treatment involve?
Treatment depends on the cause. Some problems, such as stiffness or mild instability, may first be treated with physiotherapy or bracing. Early infection may sometimes be treated by washing out the joint and exchanging the plastic insert along with antibiotics. Established infection may need a one-stage or two-stage revision. Loosening, wear and significant instability usually require revision of the affected parts.
Revision surgery carries higher risks than the first operation, including infection, blood clots, stiffness and the need for further surgery, and recovery may take longer.
What does recovery after revision involve?
Recovery after revision is often slower than after the first knee replacement and depends on the reason for surgery. After revision for infection, a course of antibiotics is usually needed, and with a two-stage approach there is a period between operations with a temporary spacer in the knee. After revision for loosening or fracture, weight-bearing may be limited for a time to allow the bone to heal.
Physiotherapy follows similar principles to the first operation: restoring straightening and bending, strengthening the thigh muscles and gradually improving walking. Goals are set realistically. Many people achieve good pain relief and function after revision, but outcomes vary, and it is important to discuss expectations openly with your surgeon before deciding.
Questions to ask your surgeon
- What is the most likely cause of my symptoms, and how certain is it?
- Are there non-surgical options worth trying first?
- What would revision involve in my case: one stage or two?
- What are the specific risks for me?
- How long might recovery take, and what help will I need?
- What could I expect to be able to do afterwards?
Bringing your original operation notes, implant details and earlier X-rays, if available, can help with planning.
Can you reduce the risk of revision?
Some measures may help protect a knee replacement: keeping to a healthy weight, staying active with low-impact exercise, preventing falls, treating infections elsewhere in the body promptly and attending follow-up appointments. Tell any doctor or dentist treating you that you have a joint replacement.
When to seek help
When to seek urgent care: go to the nearest emergency department if your replaced knee becomes hot, red and swollen with fever, if a wound starts discharging, or if you cannot bear weight after a fall.
For gradually increasing pain or instability, arrange a review with an orthopaedic surgeon. Discuss your situation with Dr. Karnav Panchal for an assessment of a painful or problematic knee replacement.
Common questions
How long does a knee replacement last?
Many knee replacements function well for many years. How long one lasts depends on factors such as activity, weight, implant type and whether complications occur.
Is pain after knee replacement always a sign of failure?
No. Some discomfort is normal during recovery. New, worsening or night pain, especially after a comfortable period, should be checked.
Can a revision knee replacement be done more than once?
Further revision is possible in some cases, although each operation tends to be more complex. Your surgeon will discuss what is realistic for your knee.
Is revision surgery more difficult than the first operation?
Usually yes. It can involve bone loss and scar tissue, and recovery may take longer. Careful planning is needed.
Related treatment page: Knee Replacement. To talk about your own symptoms, request a consultation.