Patients often arrive at the clinic having read that robotic knee replacement is "better", without a clear sense of what the robot does. Some expect a machine that performs the operation. Others assume it is marketing. Neither is right, and the real answer is more useful than either.
In a robotic-assisted knee replacement, the surgery is planned before a single cut is made. Depending on the system, the plan is built from a CT scan taken beforehand, or from points mapped on the bone during the operation itself. Either way, the result is a three-dimensional model of that particular knee — not a generic one.
The surgeon then decides, on that model, exactly where the implant should sit and how much bone should be removed. During the operation, the robotic system holds the surgeon to that plan, typically by guiding the cutting instrument and restricting it from straying beyond the planned boundaries.
The surgeon performs the operation throughout. The system is a precision instrument, in the same sense that a navigation system in a car does not drive it.
A knee replacement is, in essence, a problem of alignment and balance. The implant has to sit in the right position and orientation, and the soft tissues around the knee — the ligaments that stabilise it — need to be balanced so the joint moves smoothly through its range.
Traditionally this is achieved with mechanical jigs, measurement and the surgeon's judgement. It works, and it has worked for decades. The limitation is variability: small deviations from the intended position are difficult to eliminate entirely, and they are difficult to measure during surgery.
Robotic assistance targets exactly that. It measures, in real time, what is actually being done against what was planned.
This is where honesty matters more than enthusiasm.
The published literature fairly consistently reports that robotic-assisted knee replacement improves the accuracy of implant positioning and reduces variability between cases, compared with conventional instrumentation. That finding is reasonably well established.
What is not established is that this translates into better function years later, or into implants lasting longer. Those studies need long follow-up, and the technology is relatively young. Some trials report small early differences in pain or recovery; others find the difference narrows over the first year.
So the fair statement is this: robotic assistance improves the precision of what is done in theatre. Whether that precision produces a knee that feels better in fifteen years is still being studied. Any surgeon who tells you the question is settled is ahead of the evidence.
Several things are unaffected by the presence of a robot, and they matter more than the technology:
Yes — four are in common use for joint replacement in India: Mako, VELYS, CORI and ROSA. They differ in how they build the 3D model (some need a pre-operative CT scan, others map the joint during surgery), in how the robotic arm interacts with the instruments, and in which procedures they are approved for.
Most robotic-trained surgeons work on a single system, because that is the one their hospital installed. Being trained across systems means the choice of platform can follow the hospital and the case rather than the other way round.
Is robotic surgery safer? It is not a different operation with a different risk profile — it is the same operation performed with additional guidance. The usual risks of joint replacement still apply and should be discussed with you individually.
Does it hurt less? Some studies suggest a modest early difference; this is not consistently found, and pain relief after surgery depends on several factors besides technique.
Does it take longer? Robotic cases often take somewhat longer, particularly early in a surgeon's experience with a system, because of the planning and mapping steps.
Is it worth the extra cost? That depends on your circumstances, and it is a reasonable question to ask directly in consultation rather than to decide from a website.
Robotic assistance is a genuine advance in the precision of joint replacement surgery, not a gimmick — and also not a guarantee. It is one factor among several, and it sits below correct patient selection, sound surgical judgement and committed rehabilitation in order of importance.
If you are considering knee replacement, the useful question is not "do you have a robot?" but "is surgery the right step for me now, and if so, what is the plan?"
Consultations at Sahyadri (Deccan), Bharati Vidyapeeth (Katraj) and Apollo (Swargate).
