Onvida's newest surgical robot doesn't do the surgery. It keeps the surgeon from cutting too far.

When people hear "robotic surgery," a lot of them picture a machine doing the work while the surgeon watches. The new system at Onvida Health is closer to the opposite.

Onvida has started using a robotic platform called CORI for joint replacement, the Yuma Sun reported Oct. 23. For now, it's shoulders only.

How it works

Before surgery, the patient gets a CT scan. The system turns that scan into a 3D model of the joint, and the surgeon plans exactly where the implant goes and how much bone has to come out.

In the operating room, tracking markers tell the system where the surgeon's handheld bone-removal tool is at every moment. If the tool drifts outside the planned area, it stops.

Dr. Michael Tracy, an orthopedic surgeon and Onvida's physician vice president of surgical services, put it plainly to the Sun: "The robot is a tool." The surgeon still does the work. The machine draws the lines and won't let the tool cross them.

That's different from the da Vinci robots Onvida already uses for general surgery, like appendix removals. Tracy told the Sun that even though both get called robots, they're very different platforms.

What's next

According to Tracy:

• Shoulder replacement is available now.
• Knee replacement is expected next, on the same hardware with updated software.
• Hip replacement is waiting on final approvals from the Food and Drug Administration.

The Sun reported that the system has been released to a limited group of hospitals. Tracy named Duke, Stanford, UC San Francisco and NYU among the others using it.

What we don't know yet

The Sun's report didn't say how many patients have had the procedure in Yuma so far, what it costs, or how insurance treats it compared with a conventional shoulder replacement. Those are the questions most patients will actually have. If you're facing a joint replacement, they're worth asking your surgeon directly, along with the most basic one: whether robotic assistance makes a real difference for your particular case.

For a hospital in a mid-size desert city to have equipment that, by Tracy's account, sits alongside a short list of big academic medical centers is notable. Whether it means fewer people driving to Phoenix or San Diego for joint surgery is the part that'll be worth watching.

Sources

• Yuma Sun, Matilda Carpenter, Onvida rolls out cutting-edge robotic system for joint replacement surgery, Oct. 23, 2026. All system details and Tracy's statements.
• Featured image: Jesuiseduardo, YRMC Main Entrance, CC BY-SA 4.0, cropped. The cropped image is shared under the same license.