Revision Joint Replacement
at Aster MIMS Kannur
A knee or hip replacement that has loosened, worn, or become infected does not mean the end of independent walking. Revision surgery removes the failed implant, reconstructs the bone that has been lost, and rebuilds a stable joint. It is more demanding than the first operation, which is exactly why it deserves a surgeon trained for it and a hospital equipped for it.
Medically reviewed by Dr. Vishnu Baburaj, MS Ortho (PGI Chandigarh), MRCS (UK) · Last updated July 2026
When does a joint replacement need revision?
Modern knee and hip replacements serve most patients well for decades. But no artificial joint is guaranteed for life. Over the years, an implant can loosen from the bone, the bearing surface can wear, wear particles can dissolve surrounding bone (osteolysis), and occasionally bacteria can settle around the implant and cause infection.
The result is a joint that was once comfortable becoming painful, unstable, or swollen. Revision surgery replaces the failed implant with a new one. The challenge is that the surgeon inherits less bone than the first operation had: removing a fixed implant sacrifices bone, and loosening or infection has often destroyed more.
This is why revision is planned differently. Bone defects are mapped on CT, the reconstruction is templated in 3D, and specialised implants (metal augments, porous cones, longer stems, constrained bearings) are ready before the first incision. Infected joints follow a separate staged protocol to clear the infection before a new implant goes in.
Infection ruled out first
Every painful joint replacement is screened for infection with blood inflammatory markers and joint aspiration for culture. The answer changes the entire surgical plan, so it is established before surgery, never assumed.
Bone loss reconstructed, not ignored
Metal augments, highly porous cones and sleeves, longer stems, and bone graft rebuild the deficient bone so the new implant is supported by structure, not hope. The joint line and alignment are restored to plan.
Constraint matched to stability
Revision implants come in increasing levels of built-in stability. Dr. Vishnu uses the least constraint that gives a stable joint, preserving natural movement while preventing dislocation or giving way.
Why implants fail
Aseptic Loosening
The implant gradually separates from bone without infection, often driven by wear particles dissolving bone (osteolysis). The commonest reason for late revision.
Periprosthetic Infection
Bacteria form a biofilm on the implant that antibiotics alone cannot clear. Managed with a staged protocol: removal, antibiotic spacer, and reimplantation after clearance.
Instability & Dislocation
A joint that gives way, buckles, or dislocates repeatedly. Corrected by restoring soft tissue balance, component position, and where needed, a more constrained bearing.
Wear & Osteolysis
The plastic bearing wears over years of use and its particles trigger bone loss around the implant. Caught early, sometimes only the bearing needs exchange.
Periprosthetic Fracture
A fall can fracture the bone around an implant. Treatment combines trauma fixation with revision arthroplasty expertise, both available under one roof at Aster MIMS.
Stiffness & Malalignment
A replaced joint that never regained movement, or components positioned outside the safe zone. Revision restores alignment and allows rehabilitation to succeed.
From diagnosis to a stable joint
Evaluation & infection workup
Clinical examination, radiographs, blood inflammatory markers, and joint aspiration when infection is suspected. The cause of failure is established first, because it dictates everything that follows.
3D planning
CT maps the bone defects. The reconstruction is templated: which augments or cones, what stem lengths, what level of constraint. Implants and backups are confirmed available before the operation is scheduled.
Revision surgery
The failed implant is removed with bone-preserving techniques, defects are reconstructed, and the revision prosthesis is implanted with stable fixation. Infected joints follow the staged protocol with an antibiotic spacer first.
Guided rehabilitation
Walking begins early with support, and physiotherapy progresses on a timeline matched to the reconstruction. Follow-up imaging confirms the implant and any grafts are integrating as planned.
Revision surgery FAQ
How do I know my knee or hip implant is failing?
The common warning signs are new or worsening pain in a previously comfortable joint, a sensation of looseness or instability, swelling, difficulty bearing weight, or a change in leg length or alignment. Some failures are silent and show up only on X-rays. If you have any of these symptoms years after a joint replacement, get the joint evaluated: early diagnosis makes revision surgery simpler and preserves more bone.
Why do joint replacements fail?
The main causes are aseptic loosening (the implant gradually separates from bone, often due to wear particles causing bone loss called osteolysis), infection, instability or dislocation, wear of the bearing surface, fracture of the bone around the implant, and stiffness. Modern implants last well in most patients, but no artificial joint is guaranteed for life, and younger, more active patients place more demand on them.
Is revision surgery more complex than the first replacement?
Yes. The surgeon must remove a fixed implant without damaging bone, reconstruct the bone that has been lost, and achieve stable fixation in compromised bone. This requires specialised implants (augments, cones, stems, constrained bearings), careful pre-operative planning, and experience with the unexpected. It is why revision surgery is concentrated in the hands of surgeons with specific arthroplasty training.
What happens if my joint replacement is infected?
Infection around an implant (periprosthetic joint infection) cannot usually be cleared by antibiotics alone, because bacteria form a protective biofilm on the metal. The standard treatment for established infection is staged revision: the implant is removed, an antibiotic-loaded spacer is placed, and intravenous antibiotics are given until blood markers normalise. A new prosthesis is then implanted at a second operation. Selected early infections can be treated with washout and liner exchange.
How is bone loss reconstructed during revision?
Bone defects are mapped on CT before surgery and reconstructed using metal augments, highly porous cones or sleeves that encourage bone ingrowth, longer stems that bypass deficient bone, and bone grafting where appropriate. The reconstruction is planned in 3D so the joint line, alignment, and stability are restored rather than improvised.
What is recovery like after revision joint replacement?
Recovery follows the same principles as primary replacement, walking early with support and progressing through structured physiotherapy, but the timeline is individualised to the reconstruction. Where bone graft or cones need to integrate, weight-bearing may be protected for longer. Most patients achieve a stable, pain-free joint that restores independent walking.
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