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ROSA Robotic Technology

What is ROSA Robotic Technology?

You’re unique, and so is your individual anatomy. That’s why Zimmer Biomet offers ROSA® Knee and Partial Knee robotic technology. ROSA, which stands for Robotic Surgical Assistant, is designed to help your specially trained surgeon tailor the placement of your knee implant just for you. Here, we will explain what makes the ROSA Robotics unique, what to expect preoperatively, what will happen with ROSA Knee and Partial Knee during surgery and what to expect after your surgery.

Why ROSA Robotic Technology?


Getting a precise knee implant fit is important to your comfort and overall experience following knee replacement surgery. ROSA Robotics uses data collected before your surgery (preoperative) and during your surgery (perioperative) to inform your surgeon of many details related to your unique anatomy that may affect your implant fit. By using this data to make more informed decisions, your surgeon is able to plan for and carry out a personalized surgery based upon your individual needs.

Why Robotic Knee Surgery?

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Patients can potentially save money on their ROSA robotic surgery as the system does not require the use of CT scans.

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Less exposure to radiation1

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Increased accuracy compared to traditional knee replacement2–3

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Better implant positioning, which can result in a more natural-feeling knee after surgery4

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Potential for better long-term satisfaction and outcomes4

What is the difference between total and partial knee replacement?

Your surgeon will help you ultimately decide what treatment pathway is best for you depending upon your situation and condition, but there are some clinical benefits to a partial knee replacement.

Often, only one side of the knee is damaged. This is usually the inner side of the knee, but although less common, arthritis can also affect the outer side of the knee. A partial knee replacement, also known as a unicompartmental knee replacement, will replace only the damaged side of the knee, preserving the normal, undamaged cartilage. This may result in a smaller incision, keeping the four natural ligaments and an artificial joint which functions more like the natural knee movement.

A Personalized Surgical Experience

Your preoperative experience will be like that of most knee patients. But, unlike traditional knee replacement methods, with ROSA Knee and Partial Knee, a series of x-rays may be used to create a three-dimensional (3D) model of your knee anatomy. This 3D model will enable the surgeon to plan many specifics of your knee replacement prior to your surgery. Due to our innovative technology, CT Scans can be optional, allowing for potential cost reductions to you.

The intraoperative surgical procedure using ROSA Knee and Partial Knee is similar to traditional total and partial knee replacement, but with a robotic assistant. Your surgeon has been specially trained to use the system in order to personalize the surgical approach for your unique anatomy. It’s important to understand that the robot does not operate on its own. That means it does not move unless your surgeon prompts it to. Your surgeon is still in the operating room the entire time and is making all of the decisions throughout your surgery.

During your procedure, the system utilizes a camera and optical trackers attached to your leg to know exactly where your knee is in space. Think of it like a very detailed global positioning system (GPS) that you might use in your car. If your leg moves even a fraction of an inch, the robot can tell and adjusts accordingly. This helps ensure that the plan your surgeon puts into place is executed as intended. Throughout your surgery, the system provides your surgeon with data about your knee. This information, combined with your surgeon’s skill, helps them know how to position your implant based on your unique anatomy.

Following surgery (the postoperative phase), you will be hospitalized based upon the recovery plan your surgeon decides is best for you. This hospitalization may range from one to three days. Recovery time varies, but most people should be able to drive after two weeks, garden after three to four weeks, and golf after six to eight weeks. Your surgeon will tell you when and what activities you can return to, and what activities to avoid.

While uncommon, complications can occur during and after surgery. Some complications include, but are not limited to, infection, blood clots, implant breakage, malalignment and premature wear, any of which can require additional surgery. Although implant surgery is extremely successful in most cases, some patients still experience stiffness and pain. No implant will last forever, and factors such as your post-surgery activities and weight can affect longevity. Be sure to discuss these and other risks with your surgeon.

There are many things that your surgeon may do to minimize the potential for complications. Your surgeon may have you see a medical physician before surgery to obtain tests. You may also need to have your dental work up-to-date and may be shown how to prepare your home to avoid falls.

The decision to have surgery is sometimes difficult. We hope that this information has helped you understand the ROSA Knee System so that you can make the best decision for yourself. This information is not intended to replace the human experience and counsel of your orthopedic surgeon. If you have any further questions, please speak with your orthopedic surgeon.

Total Knee Replacement Videos

Partial Knee Replacement Videos

Additional Information

  1. Parratte, S., et al. Accuracy of New Robotically-assisted Technique for Total Knee Arthroplasty: A Cadaveric Study. The Journal of Arthroplasty. 34(11): 2799-2803, 2019.
  2. Seidenstein A, Birmingham M, Foran J, Ogden S. Better accuracy and reproducibility of a new robotically-assisted system for total knee arthroplasty compared to conventional instrumentation: a cadaveric study. Knee Surg Sports Traumatol Arthrosc. 2020 May 24. doi: 1007/s00167-020- 06038-w. Epub ahead of print. PMID: 32448945. Cadaveric testing is not necessarily indicative of clinical performance.
  3. Kayani B, Haddad FS. Robotic total knee arthroplasty: clinical outcomes and directions for future research. Bone Joint Res. 2019;8(10):438-442. Published 2019 Nov 2. doi:10.1302/2046- 3758.810.BJR-2019-0175.
  4. Marchand RC, Sodhi N, Khlopas A, et al. Patient satisfaction outcomes after robotic arm-assisted total knee arthroplasty: a short-term evaluation. J Knee Surg 2017;30:849-853.
All content herein is protected by copyright, trademarks and other intellectual property rights, as applicable, owned by or licensed to Zimmer Biomet or its affiliates unless otherwise indicated, and must not be redistributed, duplicated or disclosed, in whole or in part, without the express written consent of Zimmer Biomet.  
To find a doctor near you, click the ‘find-a-doc’ link. For printed information on joint replacement, call 1-800-447-5633.
Talk to your surgeon about whether joint replacement or another treatment is right for you and the risks of the procedure, including the risk of implant wear, loosening or failure, and pain, swelling and infection. Zimmer Biomet does not practice medicine; only a surgeon can answer your questions regarding your individual symptoms, diagnosis and treatment.