Short answerRobotic knee replacement places the implant a little more accurately on X-ray. In trials, patients did not report better pain or function than with a standard operation.
Probably does not help, for how the knee feels and works
What it is
In a standard total knee replacement, the surgeon uses cutting guides to prepare the bone. In robotic-assisted surgery, a planning system and a robotic arm help the surgeon to place the cuts and the implant. The aim is to get the alignment of the implant as close to the plan as possible.
What the research shows
with 2,200 people compared robotic and standard knee replacement. Robotic surgery probably made little or no difference to patient-reported scores. The difference on the WOMAC score was less than half a point on a scale where lower is better, and the range crossed zero. Range of movement was also much the same.
Robotic surgery did give more accurate alignment. Fewer knees were placed outside the planned alignment, with a relative risk of 0.43, and the average error was about one degree smaller. The authors noted that this gain in X-ray accuracy may not be clinically meaningful. Revision rates and major side effects did not differ, but there was not enough evidence to be sure about revisions and complications.
What the Australian joint registry shows
In the Australian joint registry, robotic assistance was used in about 4 in 10 total knee replacements in 2024. After allowing for differences between patients, robotic knees needed another operation no more and no less often than standard knees, over up to 7 years of follow up . Most robotic knees have only been followed for a few years, so longer results are not yet known.
Risks and effort
The risks of the operation itself are the same as for any knee replacement. The review did not report long term results.
What usually works instead
A well-planned standard knee replacement by an experienced surgeon gave similar scores in these trials. See Total Knee Replacement and Does knee replacement work better than non-surgical care?.
Questions people ask
Will a robotic knee last longer?
Not so far. The trials cannot say. In the Australian joint registry, robotic and standard knees had the same rate of further surgery over up to 7 years once differences between patients were taken into account . Longer results are not yet known.
Does the surgeon matter more than the technology?
The review compared the two methods and not surgeons. Ask your surgeon about their own experience and results with the method they propose.
Is it more dangerous?
The review found no difference in major side effects, but it said the evidence on complications was not sufficient.
What is the downside to robotic knee replacement?
In 12 trials with 2,200 people, patients did not report better pain or function than with a standard operation, and long term results are not known. Major side effects did not differ, but the evidence on complications was not sufficient to be sure.
Do you heal faster with robotic knee replacement?
The trials did not show faster or better recovery in pain, function or knee movement.
What is the success rate of a robotic knee replacement?
Similar to a standard knee replacement in the trials. The difference in the WOMAC score was less than half a point, and revision rates did not differ over the time studied.
Sources
Select a source to read what the study or guideline found, in plain words, with a link to the original.
Last reviewed 24 October 2026. Next review due October 2027.
