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Treatment in detailRevision knee replacement — when a replaced knee fails
A knee replacement that has become painful, loose, unstable or infected can be redone. Revision is a bigger, more demanding operation than the first — and doing it well is a defined focus of this practice.
Why replaced knees fail
The common mechanisms: aseptic loosening (the implant-bone bond fails over years), infection (early or late, sometimes seeded from elsewhere in the body), instability (the knee gives way because soft-tissue balance was never right or has stretched), stiffness, polyethylene wear, and fracture around the implant. Each failure mode dictates a different operation — which is why the diagnosis must come before any plan.
The workup: finding the cause first
Every painful replaced knee gets the same disciplined sequence: examination, fresh standing X-rays compared against old ones, blood markers of infection (ESR, CRP), and joint aspiration when infection is possible. Operating on a painful knee without a diagnosis is how one failed replacement becomes two.
What revision surgery involves
The old components are removed with bone-preserving technique, the defects left behind are rebuilt with augments, cones or sleeves, and stemmed revision implants restore a stable, aligned joint anchored in sound bone. Infected knees follow their own protocol — most often two-stage: implant removal with an antibiotic spacer first, re-implantation after the infection is proven cleared.
Setting expectations honestly
Revision patients deserve straight talk: the goal is a stable, well-aligned, pain-relieved knee that restores daily life. Most achieve it. It is surgery measured against where you are now — not against the memory of a perfect primary. That framing is discussed openly before consent, because realistic expectations are part of a good result.
How do I know my knee replacement has failed?
Warning signs: pain that is new or worsening in a previously comfortable knee, swelling or warmth, instability or giving way, grinding, reduced movement, or any discharge near the scar. A painful replaced knee always deserves evaluation — X-rays, blood markers and sometimes aspiration identify the cause.
Is revision surgery as good as the first replacement?
Honestly: a well-done revision gives most patients major pain relief and a functional knee, but on average it sits a notch below a well-functioning primary — the soft tissues and bone have been through more. This is exactly why revisions belong with surgeons who do them regularly.
What is two-stage revision for infection?
When a replaced knee is infected, the safest established path is often two operations: first, removing the implant and placing an antibiotic cement spacer while targeted antibiotics clear the infection; then, once blood markers normalise, implanting the new revision knee. Selected early infections can be managed with a single-stage protocol — the choice is made on the organism, duration and your health.
How is bone loss handled when the old implant comes out?
With a dedicated toolkit: metal augments, sleeves and cones that rebuild the defect, and stemmed revision implants that anchor into sound bone beyond it. Planning your reconstruction starts from your X-rays and CT before the operation, not on the table.
How long will I be in hospital, and how is recovery different?
Typically 3–5 days — longer than a primary knee, matching the larger surgery. Walking still begins early; overall rehabilitation is slower and milestones are set individually rather than borrowed from primary-replacement timelines.
Should I go back to the surgeon who did the first replacement?
You are free to — and equally free to seek a surgeon whose practice focuses on revision work. What matters is that whoever operates has the implants, instrumentation and experience the redo demands. A second opinion with your X-rays costs you nothing but clarity.
A knee replacement that has let you down?
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