Robotic assistance is a tool used during knee replacement surgery. It does not replace the surgeon — the surgeon plans the operation, controls the instruments, and makes every decision. What the technology adds is a detailed three-dimensional model of your knee and real-time feedback on implant sizing, positioning, and soft-tissue balance while the operation is underway.
At a glance: Robotic-assisted knee replacement uses a model of your knee to guide implant placement. The surgeon performs the operation; the system provides measurement and feedback intended to improve the precision of component positioning. It is used for both total and partial knee replacement.
The joint replacement surgeons at Midwest Orthopaedics at Rush use robotic assistance for both total knee replacement and partial knee replacement. Whether it is used in your case depends on your anatomy, the procedure planned, and your surgeon's assessment.
No, and this is the most common misunderstanding about the procedure. Arthroscopic surgery is done through very small incisions using a camera inside the joint, and knee replacement is not an arthroscopic operation regardless of whether a robot assists.
A robotic-assisted knee replacement uses an incision comparable to a conventional knee replacement. The robot is not inserted into your knee. It is a positioning and measurement system that works alongside the surgeon, and it adds small additional incisions for the tracking pins described below. Robotic assistance is about accuracy, not about making the operation smaller.
The term covers a sequence of steps rather than a single machine action:
What it does not do is operate independently. There is no scenario in which the robot decides anything or moves on its own. Every cut and every decision belongs to the surgeon.
A knee replacement is a mechanical construct inside a moving joint. Component alignment, rotation, and soft-tissue balance determine how the knee feels and functions through its arc of motion. Positioning outside the intended range is associated with pain, stiffness, and accelerated wear, and it is one of the reasons a replacement may eventually need revision surgery.
Robotic assistance is aimed squarely at that problem: making the executed position match the planned position more consistently, and reducing the outliers. It is a precision tool, and it is one factor among several — surgeon experience, implant selection, your anatomy, and your rehabilitation all bear on the result.
Yes. Robotic-assisted knee replacement requires training on the specific system being used, and there is a recognised learning curve — early cases typically take longer than the surgeon's conventional operations before the workflow becomes routine.
This is worth asking about directly. A reasonable question for any surgeon offering the procedure is how many robotic-assisted knee replacements they have performed and how long they have been using that system. The technology does not substitute for surgical judgment about implant selection, soft-tissue balance, or whether you should have a knee replacement at all.
Candidacy for robotic assistance follows candidacy for knee replacement itself. Your surgeon will evaluate:
Not every knee replacement calls for robotic assistance, and a well-performed conventional replacement remains a very good operation with decades of outcome data behind it. Your surgeon will tell you what they recommend for your knee and why.
If knee arthritis is limiting what you can do, an evaluation will establish which procedure fits your knee and whether robotic assistance is part of the plan.
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Precision is arguably most consequential in partial knee replacement. Only one compartment is resurfaced, and the implant has to work alongside the patient's own remaining cartilage, bone, and ligaments — including an intact ACL. There is less margin for a component that sits slightly proud, slightly rotated, or slightly over-corrected, because the rest of the natural knee has to accommodate it.
Robotic assistance is used for both partial and total knee replacement, and your surgeon will discuss which procedure fits the pattern of arthritis in your knee.
If your surgeon uses a system that plans from a CT scan, that scan is done in advance — typically a short appointment, and the images are used to build your knee model before you arrive. Systems that map the knee during surgery need no advance imaging.
On the day itself, the experience is much the same as a conventional knee replacement: anesthesia (regional, general, or a combination), the operation, then recovery. The setup and registration steps can add some time in the operating room, which does not change what you experience under anesthesia. Many patients are candidates for a same-day discharge, depending on health history and support at home.
Recovery after a robotic-assisted knee replacement follows the same path as the conventional operation: early walking with an assistive device, physical therapy focused on range of motion and quadriceps strength, and a gradual return to daily activity over the following months.
Timelines vary by patient, by whether a partial or total replacement was performed, and by your health and rehabilitation. Some patients go home the same day; others stay overnight. Your surgeon and physical therapist will set the milestones for your knee rather than working from a generic schedule.
The case for robotic assistance rests on accuracy, and that case is well established. Across published studies, robotic-assisted knee replacement places components closer to the surgical plan and produces fewer knees that fall outside the intended alignment range than conventional instrumentation does. Reducing those outliers is the reason our surgeons use the technology.
Component position is not a technicality. Alignment, rotation, and soft-tissue balance are what determine how a replaced knee feels and moves, and positioning outside the intended range is associated with pain, stiffness, and accelerated wear. A technique that hits the plan more consistently is addressing the variable most within a surgeon's control.
Longer-term data on implant survival is still accumulating, simply because the technology has not been in widespread use for the twenty-year horizons that joint replacement is measured over. Our surgeons use robotic assistance where it adds precision to your particular knee, and will tell you directly whether they recommend it in your case.
The risks are those of knee replacement generally — infection, blood clots, stiffness, persistent pain, implant loosening or wear over time. Considerations more specific to robotic assistance include:
Robotic-assisted knee replacement is performed by board-certified, fellowship-trained orthopedic surgeons at Midwest Orthopaedics at Rush. Our knee and sports medicine surgeons completed subspecialty fellowship training after residency, and the group treats knee conditions across the full range — from first-time injuries through complex reconstruction.
Our joint replacement surgeons perform both total and partial knee replacement with robotic assistance, and several practise at high annual volume. Because there is a learning curve with any robotic system, it is a fair question to ask your surgeon how long they have used theirs — ours will answer it.
Browse our knee specialists to read individual profiles, see where each surgeon practices, and request an appointment directly. Appointments are available across our Chicago-area locations.
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Knee replacement itself is generally a covered procedure when it is medically necessary, and robotic assistance is typically treated as part of how the operation is performed rather than as a separately billed service. Coverage still depends on your specific plan, your deductible, and the facility. Confirm the details with your insurer before surgery — our team can help you work through what to ask.
Medicare covers medically necessary knee replacement. Robotic assistance is generally not billed to the patient as a separate line item, but plan specifics, supplemental coverage, and facility setting all affect what you pay. Verify with Medicare and any supplemental plan directly.
Studies consistently show robotic assistance improves the accuracy of implant positioning compared with conventional technique. Whether that produces measurably better function or longer implant survival over the long term is still being studied. Knee replacement overall has a strong track record, and your surgeon can discuss what the current evidence suggests for a patient in your situation.
Robotic assistance places implants more accurately and produces fewer knees outside the intended alignment range — that advantage is well documented, and it is why our surgeons use it. Conventional knee replacement is also a highly successful operation with decades of results behind it, and surgeon experience remains the largest single factor either way. The right question is not which technique is better in the abstract, but which approach your surgeon recommends for your knee.
No. Your surgeon performs the operation. The system provides planning, measurement, and guidance; the surgeon controls the instruments and makes every decision.
Some studies report modest advantages in early pain and function with robotic assistance. Recovery still follows the same broad path either way, and how you do depends most on your knee, your health, and how you engage with rehabilitation. Many patients are candidates for a same-day discharge regardless of technique.
The approach to the joint is essentially the same as a conventional knee replacement, and how much soft tissue is disturbed depends on the surgical approach your surgeon uses, not on whether a robot assists. Robotic assistance does not by itself make the operation less invasive.
Broadly comparable to a conventional knee replacement, with some additional time for setup and registration. That difference tends to shrink as a surgeon accumulates experience with the system, and it does not change your experience under anesthesia.
It depends on the system. Some build the model from a CT scan taken in advance; others map the knee during the operation and need no advance imaging. Your surgeon will tell you which applies.
Yes, and precision is particularly relevant there, because only one compartment is resurfaced and the rest of your natural knee has to work alongside the implant. See our page on partial knee replacement.
If knee arthritis is limiting what you can do, an evaluation is the first step in understanding which options fit your knee. Schedule an appointment with the knee specialists at Midwest Orthopaedics at Rush.
This page is general information about a surgical technique and is not medical advice. Talk with a physician about your own symptoms, imaging, and treatment options.