Robotic Revision Knee Replacement in Birmingham
Revision of a failed knee replacement with the precision of the Smith and Nephew CORI robotic system. In June 2026 Mr Hussain became the first surgeon in the Midlands, and one of the first in the UK, to perform robotic revision knee replacement, at the Royal Orthopaedic Hospital Birmingham. ENDO-Klinik Hamburg trained in complex revision surgery.
CORI robotic revision knee
545 verified reviews
ENDO-Klinik Hamburg
Medically reviewed by Mr Shakir Hussain, MBBS MRCS FRCSEd (Tr & Orth), Consultant Orthopaedic Surgeon · Last reviewed: June 2026 · Next review due: June 2029
In Short
Robotic revision knee replacement is surgery to replace a failed knee replacement with the help of a robotic system, in Mr Hussain's practice the Smith and Nephew CORI. Unlike the robots used for first-time knee replacement, CORI needs no CT scan: it maps the bone that is actually left once the old implant has been removed, guides bone preparation within planned limits, and gives live alignment and balance measurements while the new knee is fitted. The operation typically takes 2 to 4 hours, most patients stay 3 to 5 nights, and meaningful recovery takes 3 to 6 months. Mr Shakir Hussain performs robotic revision knee replacement privately at the Royal Orthopaedic Hospital Birmingham, where he carried out the Midlands' first CORI robotic revision in June 2026. Robotic assistance adds nothing to the package price.
Also known as: robotic-assisted revision knee replacement, robot-assisted revision total knee arthroplasty (revision TKA), CORI revision knee replacement. This page covers the robotic technique; the full guide to failure causes, implant choices and the conventional operation is on the revision knee replacement page, and first-time robotic surgery on the robotic knee replacement page.
On This Page
- What is robotic revision knee replacement?
- Why robots have struggled with revision knees
- How CORI helps in revision knee surgery
- Who is suitable for robotic knee revision
- How robotic knee revision is performed
- Recovery after robotic knee revision
- Research on robotic revision knee surgery
- Robotic knee revision costs & insurance
- Why Mr Hussain for robotic knee revision
- Robotic knee revision FAQs
Overview
What Is Robotic Revision Knee Replacement?
Revision knee replacement is the operation to remove a knee implant that has failed and rebuild the knee with new components. It is among the most demanding procedures in orthopaedics: the surgeon works around scar tissue, bone that has already been cut once, and landmarks that the previous implant has altered or destroyed. Robotic revision knee replacement brings robotic assistance into that operation, so that bone preparation, implant positioning and ligament balancing are guided by live measurements rather than estimation.
Robotic surgery has transformed first-time knee replacement over the past decade, and Mr Hussain is one of a small number of UK surgeons certified on all three major platforms, MAKO, ROSA and CORI. Until recently, though, the technology stopped at the primary operation. Revision patients, who arguably had the most to gain from precision, were left with conventional instruments. That changed with the CORI system, which was the first robotic platform cleared specifically for revision knee replacement, and in June 2026 Mr Hussain became the first surgeon in the Midlands, and one of the first in the United Kingdom, to use it for a revision at the Royal Orthopaedic Hospital Birmingham.
The robot does not perform the operation. It sharpens the accuracy of the surgeon who does. Revision experience comes first; robotic precision supports it. Mr Hussain trained in complex revision arthroplasty at ENDO-Klinik Hamburg under Professor Thorsten Gehrke and Professor Mustafa Citak, and performs revision knee surgery at the Royal Orthopaedic Hospital, Priory Hospital Edgbaston and Harborne Hospital.
- Image-free robotic mapping of the knee during surgery, with no pre-operative CT scan needed
- Bone preparation confined to the planned boundaries, protecting the remaining bone stock
- Live alignment and gap-balance data throughout the reconstruction
- Compatible with modern revision implant systems including stems, augments and cones
- Performed by a surgeon trained at one of the world's highest-volume revision centres
The Technical Problem
Why Has Robotic Surgery Been Difficult in Revision Knee Replacement?
Most robotic knee systems plan the operation from a pre-operative CT scan. The scan is converted into a three-dimensional model of the knee, the surgeon positions the new implant on that model, and the robot then holds the cutting tools to the plan. In a first-time knee replacement this works well because the scan shows clean bone.
In a revision it breaks down for a simple reason: the knee already contains a metal implant, and metal distorts CT and MRI images. The scan cannot reliably show the bone hidden beneath the old components, nor the defects that will only become apparent once they are removed. A plan built on a distorted picture is a plan built on guesswork.
The CT problem
Image-based robots need an accurate scan before surgery. The existing metal implant scatters the X-ray beam, producing streaks and shadows exactly where the surgeon most needs detail: at the bone-implant interface and in the metaphyseal bone that will carry the new implant. The true extent of bone loss is often only visible once the old components are out, by which point a CT-based plan is already fixed.
The CORI answer
CORI is image-free. Instead of a scan, the surgeon maps the surfaces of the knee with a tracked probe during the operation itself. In revision surgery that mapping is done after the failed implant has been removed, so the plan is built from the bone that is actually there, defects included. The robot then guides bone preparation to that plan and reports alignment and gap balance in real time as the new components are trialled.
This is why CORI was the first robotic platform to receive a specific revision knee indication, in 2022, paired with the LEGION revision knee system, and why Mr Hussain, despite being certified on all three platforms, uses CORI for robotic revision.
Robotic Precision Where It Counts
How Does the CORI Robot Help in Revision Knee Surgery?
Every advantage robotic assistance brought to primary knee replacement counts double in revision, where the margin for error is smallest and the bone least forgiving. Four things matter most.
Real-Time Bone Mapping
Once the old implant is out, Mr Hussain maps the remaining femoral and tibial bone with a tracked probe. CORI builds a three-dimensional model of what is left, including cavities and defects, and the reconstruction is planned on that model in theatre. No CT scan, no metal artefact, no surprises hidden by the old implant.
Bone-Preserving Preparation
Bone stock is the most precious commodity in revision surgery: every millimetre kept makes the new fixation stronger and preserves options for the future. CORI's handheld robotic cutting tool works only within the planned boundaries and slows or stops if it strays, so old cement and damaged surfaces are cleared without sacrificing healthy bone.
Objective Alignment and Balance
Restoring a straight, stable leg is the central challenge of revision, and the usual landmarks are often gone. CORI displays leg alignment and the gaps between femur and tibia through the full range of movement as each trial component is fitted, replacing estimation with numbers and helping Mr Hussain choose the right constraint level, insert thickness and augment size.
Built for an Unpredictable Operation
Revision surgery rarely goes exactly to plan. CORI's compact handheld design fits the changing workflow of a revision more readily than a large robotic arm, and its quick set-up adds little to operating time. If the plan needs to change once the bone is exposed, the surgeon re-maps and re-plans in minutes.
In plain terms: revision knee surgery means rebuilding a knee where the normal landmarks are gone and the bone is already compromised. The CORI robot maps what is actually there, in theatre, in real time, then helps the surgeon remove only what was planned and nothing more. Accuracy matters most precisely where there is least room for error.
Is It Right for You?
Who Is Suitable for Robotic Revision Knee Replacement?
Robotic assistance is a technique, not a separate operation, so the first question is always the same as for any revision: why has the knee failed? Mr Hussain's assessment includes examination, X-rays, blood tests, and CT or knee aspiration where needed; the failed knee replacement page explains the warning signs and the diagnostic pathway. Once the cause is clear, robotic assistance is considered for the reconstruction.
Situations where CORI is most useful
Revision of a failed partial (unicompartmental) knee replacement to a total knee replacement, where accurate cuts on the untouched side of the knee and precise balancing determine the result. Aseptic loosening of one or both components, where the bone defects left behind need mapping and reconstruction. Instability and malalignment, where objective gap and alignment data guide the choice of constraint. Stiffness with a component sizing or positioning problem that needs correcting.
Situations decided case by case
Infection changes the priorities: eradicating it comes first, whether by DAIR surgery for early acute infection or two-stage revision for established infection, and whether robotic assistance is used for the definitive reconstruction is decided individually. Very severe bone loss requiring a hinged implant or distal femoral replacement, and fracture around the implant, are also planned individually. Mr Hussain will tell you plainly at consultation whether robotic assistance offers a benefit in your case.
The Operation
How Is Robotic Revision Knee Replacement Performed?
The operation is performed under spinal or general anaesthetic, chosen with a specialist anaesthetist; our guide to spinal versus general anaesthetic explains the options. It follows the same two broad stages as any revision, removal and reconstruction, with the robot brought in at the point where precision matters most.
Exposure and Implant Removal
The previous incision is used wherever possible and scar tissue is released to restore access and movement. The failed components are removed with fine saws and osteotomes at the implant-bone or implant-cement interface, protecting the bone beneath and guarding the extensor mechanism throughout. All cement and inflammatory membrane are cleared.
Robotic Registration and Mapping
Small tracking arrays are attached to the femur and tibia so the CORI camera can follow the leg's position. Mr Hussain then maps the exposed bone surfaces with a tracked probe, and the system builds a three-dimensional model of the remaining bone, including any defects, in a matter of minutes. The leg's mechanical axis is recorded at the same time.
Planning on the Real Anatomy
On the intra-operative model, the new components are sized and positioned to restore the joint line, alignment and rotation. CORI predicts the gaps between femur and tibia through the range of movement for the chosen plan, so the level of constraint, insert thickness and any augments can be decided before a cut is made.
Robotically Guided Bone Preparation
The handheld robotic cutting tool prepares the bone to the plan and only to the plan: it slows or stops at the planned boundary. Damaged bone and residual cement are removed and defects are shaped to receive augments, cones or graft while healthy bone is preserved.
Reconstruction, Balancing and Fixation
Defects are rebuilt with metaphyseal cones, metal augments or bone graft, and intramedullary stems carry load past the reconstructed area into healthy bone. Trial components are fitted and CORI reports alignment and gap balance through the full range of movement; adjustments are made until the knee is stable and straight. The definitive components are then fixed, the patella assessed and resurfaced where needed, and the wound closed in layers.
The implant systems used are the same modern revision platforms as in conventional surgery, including primary-style components for simpler cases, constrained condylar knees for ligament deficiency, and stemmed revision systems with augments and cones for bone loss; the implant options in knee revision are described in full on the main revision knee page.
Case example: failed partial knee replacement revised to a CORI robotic-assisted total knee replacement
A patient whose partial (unicompartmental) knee replacement, performed many years earlier, had become increasingly painful as arthritis spread across the rest of the joint, with the leg drifting into a 10 degree bow-legged (varus) alignment and bending limited to about 100 degrees despite non-operative treatment (left). Mr Hussain revised it to a total knee replacement with CORI robotic assistance: the femur and tibia were mapped once the old implant and cement had been removed, the bone defects were mapped and the cuts adjusted to the bone actually present, a small defect on the tibia was bypassed with a cemented stem, and the kneecap was resurfaced (right). By the end of the operation the leg alignment had been corrected to within a few degrees of neutral, the ligaments were balanced throughout the range, and the knee moved from full extension to 140 degrees.
Case example: stiff, painful total knee replacement revised with CORI robotic assistance
A patient whose total knee replacement, performed about four years earlier, had become stiff and painful, bending only from 5 to 85 degrees despite several manipulations under anaesthetic and extensive physiotherapy (left). Infection was excluded and the case was discussed at the multidisciplinary meeting before surgery. At operation the soft tissues were heavily scarred and the original implants were well fixed, so they were removed carefully with minimal loss of bone. The CORI robot mapped the femur and tibia once the components were out, planned the fresh cuts to the bone actually present, and guided the additional cuts needed for augments on the femur. Stemmed revision components were cemented in place and the kneecap resurfaced (right). By the end of the operation the knee moved from 5 to 130 degrees.
Getting Back On Your Feet
Recovery After Robotic Revision Knee Replacement
Recovery follows the same path as any revision knee replacement and takes longer than after a primary knee. Robotic assistance does not by itself shorten rehabilitation, although preserving bone and achieving a well-balanced knee are the foundations on which good recovery is built. Most patients follow a path like this:
- Day of surgery to day 1: standing and walking with physiotherapy support, and early knee bending exercises begin.
- Days 3 to 5: discharge home once pain is controlled, the wound is settled, and you are safe with walking aids.
- Weeks 1 to 6: progressive physiotherapy for range of movement and quadriceps strength; weight-bearing is protected where the reconstruction requires it.
- Months 3 to 6: meaningful improvement in pain and day-to-day function for most patients.
- Months 12 to 18: maximum function is reached.
Follow-up is closer than after primary surgery, with reviews at 6 weeks, 3 months, 6 months and 12 months, and physiotherapy support throughout.
An Honest Look at the Data
What Does the Research Say About Robotic Revision Knee Surgery?
Robotic revision knee replacement is new, and it is important to be honest about what the evidence does and does not yet show. A 2026 systematic review in Current Reviews in Musculoskeletal Medicine gathered 19 studies of robotic-assisted knee replacement in complex primary and revision cases, including five studies and 340 revision knees, 298 of them robotic. Across those revision series the leg alignment achieved was within about one degree of neutral, implant survival was 97 percent, and the rate of further revision was 1.5 percent over the follow-up periods reported, with complication rates in the same range as conventional revision.
The authors' conclusion was measured: robotic assistance reliably restored alignment and produced perioperative and patient-reported outcomes comparable to conventional techniques in complex and revision cases. Most of the studies were retrospective, follow-up was short, and only one randomised trial was included. In plain terms, the technique is accurate and safe in the published series, but it has not yet been shown to produce better long-term results than an experienced surgeon achieves conventionally. That is why Mr Hussain describes robotics as a tool that supports judgement rather than a substitute for it, and why he uses it alongside, not instead of, the revision expertise gained at ENDO-Klinik Hamburg.
You can read the site's plain-English comparison of robotic versus conventional knee replacement, and the account of the Midlands' first CORI robotic revision knee replacement.
Fees & Funding
Robotic Revision Knee Replacement Cost in Birmingham
Mr Hussain's revision knee packages at the Royal Orthopaedic Hospital start from £17,750 for revision of a partial (unicompartmental) knee replacement to a total knee replacement, and from £22,000 for a full single-stage revision. Each package covers the surgeon's fee, the anaesthetist, the revision implant system and your hospital stay. Robotic assistance is included at no additional charge: the price of a robotic revision is the price of the revision. Because no two revisions are alike, the final figure is confirmed in writing after your consultation and imaging review, before you decide to proceed.
Treatment is covered by all major private medical insurers: Bupa, AXA, Vitality, WPA and Aviva. Mr Hussain is fee-assured with the major insurers, and Wendy, his secretary, can guide you through authorisation; our insurance pre-authorisation guide explains the process step by step. Full details are on the fees and pricing page.
Revision Experience First, Robotic Precision in Support
Why Choose Mr Hussain for Robotic Revision Knee Surgery?
Very few surgeons combine a subspecialty revision fellowship with certification on every major knee robot. Mr Hussain trained at ENDO-Klinik Hamburg, one of the world's leading centres for revision arthroplasty, is certified on MAKO, ROSA and CORI, and performed the Midlands' first CORI robotic revision knee replacement in June 2026. His practice at the Royal Orthopaedic Hospital, Priory Hospital Edgbaston and Harborne Hospital is built on more than 5,000 procedures, 33 peer-reviewed publications and a Doctify rating of 4.98 from 545 verified reviews.
Explore his revision hip and knee outcomes and learn how to read your surgeon's NJR results.
Read more about Mr Hussain's work as a revision hip and knee surgeon in Birmingham.
Key Takeaways
Robotic Revision Knee Replacement at a Glance
- Robotic revision knee replacement uses the CORI system to guide the rebuilding of a failed knee replacement with live bone mapping, bounded bone preparation and real-time alignment and balance data.
- CORI works in revision where CT-based robots cannot, because it needs no scan: the bone is mapped in theatre after the old implant has been removed, so metal artefact is never an issue.
- It is most useful for partial-to-total conversions, aseptic loosening, instability and malalignment; infection, severe bone loss and fracture cases are planned individually.
- Published series show accurate alignment and safety comparable to conventional revision; long-term superiority has not yet been demonstrated, and surgeon experience remains the decisive factor.
- Mr Hussain performed the Midlands' first CORI robotic revision knee replacement in June 2026, is certified on MAKO, ROSA and CORI, and trained in revision surgery at ENDO-Klinik Hamburg.
- Packages from £17,750 (partial to total) and £22,000 (full single-stage revision) at the Royal Orthopaedic Hospital, with robotic assistance included at no extra charge; all major insurers accepted.
Patient Questions
Frequently Asked Questions
References and further reading
- Smith+Nephew. First to market with revision knee indication on robotics platform (CORI Surgical System, LEGION Revision Knee System), September 2022. prnewswire.com
- Robotic-Assisted Total Knee Arthroplasty in Complex Primary and Revision Cases: A Systematic Review. Current Reviews in Musculoskeletal Medicine, 2026. pmc.ncbi.nlm.nih.gov
- National Joint Registry (NJR). Annual reports and revision knee implant performance data. njrcentre.org.uk
- National Institute for Health and Care Excellence (NICE). Joint replacement (primary): hip, knee and shoulder, NG157. nice.org.uk/guidance/ng157
- NHS. Knee replacement. nhs.uk/conditions/knee-replacement
Medically reviewed by Mr Shakir Hussain, Consultant Orthopaedic Surgeon. Last reviewed: June 2026. Next review due: June 2029.
Ready to Discuss Your Knee Revision?
Book a private consultation with Mr Hussain at the Royal Orthopaedic Hospital, Priory Hospital Edgbaston, or Harborne Hospital.