Am I a Candidate for Robotic Knee Replacement?

It is one of the first questions patients ask me in clinic at Aster MIMS Kannur: "Doctor, am I suitable for the robot?" It is a sensible question, but it usually has the logic slightly back to front. The honest answer is that the robot is rarely the thing that decides who is suitable. Your knee decides that.

Let me explain what I mean, because once you see it, the whole decision becomes much simpler.

First question: do you need a knee replacement at all?

Long before we talk about robotics, there is a more important conversation. A knee replacement is recommended when two things are true together. First, you have significant, persistent symptoms: pain that disturbs your sleep, stiffness that limits your walking, a knee that has stopped letting you live the way you want to. Second, the sensible non-surgical options have genuinely been tried and have stopped helping. That usually means weight management where relevant, activity changes, physiotherapy, painkillers or anti-inflammatories, and sometimes an injection.

When pain and loss of function persist despite all of that, and your X-rays confirm worn-out cartilage that matches your symptoms, a replacement becomes a reasonable option. Notice that none of this depends on the technology in the operating theatre. The case for surgery is built entirely from your story and your X-rays.

So who is a candidate for the robotic version?

Here is the part that surprises people. Almost everyone who is a candidate for a knee replacement is also a candidate for the robotic-assisted version. Robotic assistance is not a different operation reserved for special cases. It is the same operation, planned and executed with more precise guidance.

The CORI robotic system we use at Aster MIMS Kannur is an image-free, handheld tool. It does not need a pre-operative CT scan or MRI. During the operation I map your own bone landmarks with a handheld probe, the software builds a three-dimensional model of your knee, it assesses how the gaps behave as the knee bends, and I then remove bone and position the implant under the system's guidance. The aim throughout is fewer positioning errors than conventional instruments allow. If you want the full picture of how it works, our complete guide to robotic knee replacement walks through each step.

Total or partial: robotic suits both

Not every worn knee needs the whole joint replaced. When only one compartment is damaged, a partial (unicompartmental) knee replacement resurfaces just that part and leaves the healthy bone and ligaments alone. Robotic guidance is useful for total knee replacement, and it is arguably even more valuable in partial knee surgery, where the margins for error are smaller and getting the alignment exactly right matters more.

The honest part: precision is the proven benefit

I will not sell you something the evidence does not support. Across the large reviews of robotic versus conventional total knee replacement, the consistent finding is this: robotic assistance reliably reduces alignment outliers and places the implant closer to the planned position. Where surgeons want neutral alignment, robotic technique gets there more consistently, with fewer knees ending up off-target.

What the same studies show is that short to medium term pain, function and satisfaction scores are so far broadly similar to manual surgery, and complication and revision rates are similar too. In other words, the proven edge is precision and consistency, not a guaranteed better-feeling knee. Robotic surgery does tend to take a little longer in theatre. Long-term benefit and cost-effectiveness are still being studied. You can read more about the operation itself on our knee replacement page.

When we might pause, or choose manual

Most candidacy decisions are straightforward, but not all. There are situations where I will slow down, examine the knee carefully, and sometimes recommend a manual approach instead, or advise against surgery for now. This is why an individual assessment matters more than any general rule.

None of these is automatically a "no". Most are simply a "let us talk about it properly first". And to be clear, factors people worry about most, such as age or having other health conditions, rarely rule out the robotic route on their own. Your overall health is assessed exactly as it would be for any knee replacement, because the recovery and anaesthetic demands are the same.

What we actually assess in clinic

When you come to see me, working out candidacy is a structured, unhurried process. There is no single test that says yes or no. It is a picture built from several things together.

• Your story. How the pain affects sleep, walking, stairs, work and the things you love. This carries more weight than any single image.
• Examination. The range of movement, stability, alignment of the leg, and how the knee behaves under load.
• X-rays. Standing X-rays show the pattern and severity of wear and any deformity, and tell me whether a partial or total replacement fits.
• Overall health. A fitness check for surgery and anaesthesia, done with the anaesthetic team where needed.
• Your goals. What a good result looks like for you, so the plan is built around your life, not a textbook.

Only after all of that do we discuss the approach. For the great majority of people who genuinely need a knee replaced, robotic-assisted surgery with the CORI system is a precise, sensible way to do it. For a small minority, I will recommend something different, and I will tell you exactly why.

Finding out where you stand

If your knee has reached the point where it is limiting your life despite trying the non-surgical options, the most useful next step is an assessment. I run a dedicated knee clinic at Aster MIMS Hospital, Kannur, and see patients from across North Kerala and the Malabar region, including Thalassery, Taliparamba, Payyannur, Mattannur and Iritty. Bring any recent X-rays if you have them. You can book an assessment through the clinic, and we will work out, together, whether a knee replacement is right for you and how best to do it.