Robotic vs. traditional knee replacement: what the research shows

I've used Mako robotic-arm assisted surgery for more than a decade, and it's one of the most common topics in my office. The short answer is that the evidence for accuracy is strong, the evidence for faster early recovery is encouraging, and the long-term picture is still being written. Here's the detail.

First, what the robot does and doesn't do

The robot doesn't operate on its own. Before surgery, a CT scan of your knee becomes a 3D model, and I plan the size, position and alignment of your implant on it. In the operating room I guide the robotic arm, and it provides tactile boundaries that help keep bone preparation inside the area I planned. Think of it as a precision tool in the surgeon's hands.

Accuracy: the clearest benefit

The most consistent finding across studies is that robotic assistance places implants closer to the plan. In a randomized trial of 139 partial knee replacements, robotic surgery was more accurate in every direction measured. For the tibial component, 80% of robotic cases were within 2 degrees of the planned position, compared with 22% of conventional cases.¹ A 2025 review that pooled ten systematic reviews of total knee replacement reached the same conclusion: robotic surgery improves alignment accuracy and reduces outliers.²

Early recovery: encouraging results

In a study of 80 consecutive patients, robotic-arm assisted total knee replacement was associated with less pain after surgery, less need for pain medication, better knee bend at discharge, and a shorter hospital stay: a median of 77 hours compared with 105 hours.³

A larger 2025 study of 1,434 knee replacements compared robotic surgery with computer navigation alone. Robotic patients had shorter operations and hospital stays, higher knee scores at two years, and were less often dissatisfied: 3% compared with 9% at two years.⁴

What isn't proven yet

I think it's important to be straight about this. The same 2025 review found that improvements in accuracy and early recovery have not consistently translated into better long-term function, satisfaction or implant survival.² Robotic systems are also expensive, and most studies have short to medium follow-up. Longer studies are under way.

Why I use it

For me, the value is in carrying out a precise, personal plan for every knee, including the knees that don't match the textbook. Precision is a means to an end. The end is a knee that feels natural and lets you get back to what you love. If you'd like to talk through whether robotic surgery makes sense for your knee, I'm happy to walk you through your own scan and plan.