Revision Knee Replacement: When a Knee Replacement Fails
Why a knee replacement can fail years later, the warning signs, and what revision surgery involves — from a surgeon who treats these cases in Uppal, Hyderabad.
Published 12 Aug 2026 4 min read
Medically reviewed by Dr. Jagdish Pusa
MBBS, MS Orthopaedics (Osmania University)
Trauma & Joint Replacement Surgeon · 17+ years
Last reviewed 17 Aug 2026
Short answer
Revision knee replacement is a second operation to replace an implant that has worn out, loosened, become infected or unstable. The warning signs are new pain after a pain-free period, a feeling of the knee giving way, swelling that will not settle, or reduced walking distance. It is technically harder than a first replacement because bone must be reconstructed, so it needs a surgeon who performs them regularly.
A knee replacement is not permanent. It is a mechanical bearing under load, and like any bearing it has a service life. Most last fifteen to twenty years. Some do not.
When one fails, patients usually describe the same thing: the knee was fine, sometimes for a decade, and then it started hurting again. That sentence — fine, then not fine — is the single most useful piece of information in the consultation.
Why do knee replacements fail?
Wear. The plastic bearing surface gradually wears. Particles from that wear can provoke the body into resorbing bone around the implant, which then loosens. This is the classic long-term failure and usually shows up after ten to fifteen years.
Aseptic loosening. The implant separates from the bone without infection. Pain is typically worse on standing up and on first steps.
Infection. Can appear early, or years later from bacteria travelling through the bloodstream — from a dental abscess, a skin infection, a urinary infection. Usually painful, often with warmth, swelling and sometimes fever.
Instability. The ligaments balancing the knee stretch or were never quite balanced. The knee feels like it might give way, especially on stairs or uneven ground.
Stiffness. Scar tissue restricting movement, usually within the first year.
Periprosthetic fracture. A break in the bone around the implant, typically after a fall.
What are the warning signs?
Worth getting reviewed if you notice:
- New pain after a comfortable period — the most significant sign of all
- The knee giving way, or feeling unstable on stairs
- Swelling that does not settle, or warmth and redness
- Walking distance shrinking month by month
- A new grinding or clunking sensation
- Pain that is worse on the first few steps after sitting
A separate category worth naming: a knee that never became comfortable after the original surgery. That is not a failed implant so much as an unresolved problem, and it deserves a proper second look rather than being accepted.
How is it assessed?
- X-rays, including standing films, compared against older ones if you have them. Bring every previous X-ray you can find — the change over time is often more informative than any single image.
- Blood tests — CRP and ESR, to flag infection.
- Joint aspiration — fluid drawn from the knee and cultured, when infection is suspected. This is the test that decides between a one-stage and a two-stage revision, so it matters.
- CT or nuclear scans occasionally, for bone loss or hard-to-localise loosening.
- Implant records. If you have the sticker card or discharge summary from the original surgery, bring it. Knowing the exact implant used makes planning considerably easier.
What does revision surgery involve?
The old implant is removed, any deficient bone is reconstructed, and a new implant is fitted — usually with a longer stem to gain fixation in healthy bone further up and down the leg, and sometimes with augments or wedges to replace missing bone.
If infection is present, it is normally a two-stage process: implant removed and an antibiotic-loaded spacer placed, several weeks of antibiotics, then a new implant once the infection is cleared. It is slower and harder, but attempting a single-stage revision through active infection tends to fail.
The reason this needs a surgeon who does it regularly is bone stock. A first replacement is a reproducible operation on predictable anatomy. A revision is a reconstruction problem, and how much bone is left is often only fully clear once the old implant is out. Experience is what makes that manageable rather than improvised.
Reducing the odds of needing one
- Keep weight down — load is the main driver of wear
- Treat infections promptly, including dental ones
- Tell your dentist and any surgeon that you have a joint replacement
- Avoid repetitive high-impact activity
- Have the knee reviewed if anything changes, rather than waiting a year
Getting an opinion in Uppal
Dr. Jagdish Pusa consults in orthopaedics at UNO Super Speciality Clinics, Uppal, Monday to Saturday, 6–9 PM, with revision knee replacement, bone tumours and limb-salvage reconstruction as areas of particular interest.
Bring your old X-rays, the discharge summary from the original surgery, and the implant details if you have them. Not every painful replacement needs revising — a fair number turn out to have a treatable cause outside the implant entirely.
A note on this article. It is written for general awareness and cannot replace an examination. Symptoms that look alike often have very different causes, and the right treatment depends on your own history and scans. If anything here sounds like your situation, please book a consultation rather than self-treating.
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Common questions
How long should a knee replacement last?
Fifteen to twenty years in the large majority of patients, and often longer in someone who is not overweight and not doing heavy manual work. Failure before ten years is uncommon and always worth investigating properly rather than accepting as bad luck.
What are the signs my knee replacement is failing?
New pain after a period of being comfortable is the most important one. Also: a sense of the knee giving way or being unstable, swelling that does not settle, warmth and redness, reduced walking distance, or a grinding sensation that is new. Pain that started immediately after the original surgery and never went away is a different problem and also needs review.
Is revision surgery riskier than the first replacement?
It is a bigger operation. It takes longer, involves more blood loss, and the bone is often deficient where the old implant sat, so reconstruction components may be needed. Recovery is slower. Done by a surgeon who does these regularly, the results are good — but it is not a routine procedure and should not be treated as one.
Can an infected knee replacement be saved?
Sometimes. An infection caught within a few weeks of surgery can occasionally be treated by washing out the joint and exchanging the plastic liner. An established, long-standing infection usually needs the implant removed, a spacer placed with antibiotics, and a new implant fitted weeks later — a two-stage revision.
How long is recovery after revision knee replacement?
Expect it to be slower than a first replacement. Most patients walk with support within a few days, but the full recovery commonly runs nine to eighteen months rather than six to twelve. The final range of movement also tends to be a little less than after a primary replacement.