Robotic knee replacement is marketed heavily, and the claims patients hear range from reasonable to nonsense. It is worth separating what the technology genuinely does from what it is often said to do.
What the robot actually is
It is not an autonomous machine. The surgeon plans the procedure on a three dimensional model of the patient's knee, and the robotic arm then constrains the bone cuts to that plan within a defined boundary. The surgeon performs the operation. The system improves the precision with which the plan is executed.
Put simply, it does not decide what to do. It helps do accurately what has already been decided.
What it improves
The consistent, well demonstrated benefit is accuracy of implant positioning and limb alignment, with fewer outliers. Soft tissue balance can be assessed quantitatively through the range of movement rather than by feel alone, which allows the plan to be adjusted before any bone is cut.
For a surgeon, the practical gain is control over small decisions: a degree of rotation, a millimetre of resection, the balance between flexion and extension gaps.
What it does not change
It is not a different operation. The implant is the same class of implant. The incision is not inherently smaller because a robot was used. Recovery time is determined far more by the surgical approach, pain management and rehabilitation than by whether navigation was used.
Long term survivorship data comparing robotic and conventional knee replacement is still maturing. Claims that a robotic knee will definitely last longer are not yet supported by the evidence, and patients should treat such claims with caution.
Where the approach matters more than the technology
How the surgeon reaches the joint has a large effect on early recovery. A minimally invasive mini subvastus approach works beneath the quadriceps rather than cutting through the extensor mechanism, which tends to allow earlier straight leg raise and earlier confident walking.
Technology and approach are independent choices. A well executed conventional replacement through a good approach by an experienced surgeon usually outperforms a poorly planned robotic one.
The questions worth asking
Ask how many of these procedures the surgeon performs, what approach they use and why, how they manage pain in the first week, and what the rehabilitation plan looks like. Ask what the implant is and why it was chosen for you.
Ask what the plan is if something does not go smoothly. A surgeon who answers that clearly is telling you more about your likely outcome than any brochure about equipment.
A detailed comparison is available here: https://www.mayurajcc.com/knee-replacement-guides/robotic-vs-conventional-knee-replacement
The reasonable summary
Robotic assistance is a genuine advance in precision and a useful tool in experienced hands. It is not a substitute for surgical judgement, correct patient selection or good rehabilitation, and it should not be the main reason a patient chooses a surgeon.