Robotic knee surgery is becoming increasingly common across Sydney, yet many people still have understandable questions about what it actually involves. Some assume it’s purely a high-tech trend, while others worry it may not be right for them. In reality, robotic-assisted knee surgery is a well-established and clinically supported approach to total and partial knee replacement that enhances surgical precision, not replaces the surgeon.
As a specialist knee surgeon in Sydney, Dr Jonathan Negus offers robotic-assisted procedures using both Mako Total Knee SmartRobotics™ (which uses CT imaging) and VELYS™ Robotic-Assisted Solution (which generates a model intra-operatively without the need for pre-op scans).
This blog aims to clarify some of the most common misconceptions about robotic knee surgery, so you can make informed decisions about your care.
Misconception 1: “The Robot Does the Surgery, Not the Surgeon”
One of the most common myths is that the robot replaces the surgeon. This is simply not the case.
In robotic-assisted surgery, the surgeon remains in full control of every step. The robotic system does not perform any part of the operation independently. Instead, it serves as a highly accurate planning and guidance tool. It allows the surgeon to map the knee’s anatomy in real time, refine implant placement, and make highly personalised adjustments with millimetre-level precision.
Both Mako and VELYS systems assist the surgeon; they do not replace clinical experience or decision-making.
For patients wanting a clearer picture of the process, from surgical planning to implant positioning, learning more about how robotic knee surgery works can provide useful context before discussing your options in detail.
Misconception 2: “Robotic Surgery Is Experimental or Unproven”
Despite how it may sound, robotic-assisted knee replacement is not an experimental technique. It has been used in operating theatres around the world for over a decade, including in leading Sydney hospitals.
Robotic systems are designed to improve surgical accuracy, particularly around bone cuts and implant alignment. Clinical studies suggest that precise alignment may play a role in optimising implant function and potentially reducing soft-tissue irritation. However, like all surgical tools, robotic systems are used in combination with the surgeon’s experience and individual patient needs.
Misconception 3: “It’s Only for Younger or Fitter Patients”
Robotic knee surgery is not limited to younger or more active people. In fact, many older adults or those with complex alignment issues may benefit from the added planning and control robotic systems provide.
Eligibility for robotic-assisted knee surgery is not determined by age or activity level alone. Instead, it depends on your overall joint health, medical status, and what kind of procedure, whether total or partial knee replacement, is most appropriate for your condition.
Your surgeon will assess whether robotic assistance is suitable as part of a broader personalised care plan.
Misconception 4: “Robotic Surgery Takes Longer”
While robotic surgery involves additional planning, including intraoperative mapping or pre-operative CT scans (depending on the system used), this does not necessarily mean a significantly longer operation.
The time spent on robotic setup is generally offset by more efficient decision-making and a smoother implant fit. Robotic systems help the surgeon avoid guesswork and reduce the need for manual trial-and-error adjustments, which may actually streamline the overall process.
Importantly, surgical time is carefully managed and does not compromise safety or quality of care.
Misconception 5: “It Costs More to Have Robotic Surgery”
In Dr Jonathan Negus’s practice, there is no additional charge for robotic-assisted knee surgery. Whether your procedure is performed with Mako or VELYS technology, your fees remain the same as non-robotic surgery.
At the hospitals where Dr Negus operates, including Norwest Private Hospital (which will begin offering robotic total knee replacement from mid-August 2025), this no-gap policy applies to most eligible privately insured patients.
It’s important to note that cost models may vary in other states or hospitals. Patients are encouraged to confirm with their treating surgeon or insurer for full transparency.
Misconception 6: “Recovery Is Instant or Painless After Robotic Surgery”
Robotic assistance may help optimise implant positioning and potentially support smoother joint function, but it doesn’t eliminate the need for recovery. Like any major surgery, knee replacement requires a dedicated rehabilitation process.
Walking aids, physiotherapy, swelling management, and gradual return to activity are all part of the normal recovery pathway, whether or not robotic systems are used. Pain management and sleep quality can also vary from person to person.
Robotic surgery is a tool that supports precision. Recovery still depends on multiple individual and clinical factors.
Misconception 7: “All Robotic Systems Are the Same”
Not all robotic knee systems work the same way, and it’s helpful to understand the differences.
The Mako SmartRobotics™ system uses a CT scan taken before surgery to create a detailed 3D plan. This helps guide implant placement with strong anatomical accuracy. The VELYS™ Robotic-Assisted Solution, on the other hand, does not require a CT scan. It builds a model intra-operatively using real-time soft tissue and bony landmarks.
Both systems are designed to support accurate alignment and implant fit. The choice of platform depends on the surgeon’s preference, patient needs, and hospital facilities.
Misconception 8: “Robotic Surgery Is Risk-Free”
No surgical procedure is without risk. While robotic systems support improved accuracy and surgical planning, they do not remove the inherent risks associated with knee replacement, such as infection, stiffness, bleeding, or implant wear.
Rather than viewing robotic surgery as a risk-free solution, it’s better understood as one component in a wider care framework that includes surgical experience, appropriate patient selection, and rehabilitation planning.
Your surgeon will always discuss the potential risks and benefits of robotic knee surgery based on your individual health profile.
Misconception 9: “If My GP Didn’t Mention It, It Must Not Be Necessary”
GPs play a key role in recognising joint problems and making referrals, but they may not always discuss the finer details of surgical techniques such as robotic assistance.
Whether robotic surgery is appropriate will ultimately be determined by your treating specialist. If it hasn’t been mentioned yet, it’s not necessarily because it isn’t suitable; it may simply not have come up in earlier conversations.
Patients are encouraged to ask questions during their specialist consultation to understand all available options clearly.
Separating Fact From Fiction
Robotic knee surgery continues to evolve and is now a standard offering in many modern orthopaedic practices. But like any medical advancement, it comes with its share of misunderstandings.
What matters most is working with a surgeon who takes time to explain your options, answer your concerns, and recommend what’s best for your situation, whether that involves robotic assistance, conventional surgery, partial replacement, full knee reconstruction, or knee arthroscopy.
If you’re exploring knee surgery in Sydney and want balanced, expert guidance on the options available, including robotic-assisted techniques using Mako or VELYS, a consultation with Dr Jonathan Negus can help you understand what’s most appropriate for your individual needs and goals.
Frequently Asked Questions (FAQs)
1. Can robotic knee surgery be used for both osteoarthritis and injury-related conditions?
Yes, robotic-assisted knee surgery may be considered for various causes of joint damage, including osteoarthritis and certain types of post-traumatic or degenerative conditions. Your suitability depends on joint stability, alignment, and overall knee function, not just the original cause of damage.
2. Is robotic knee surgery available in the public hospital system?
Access to robotic-assisted surgery can vary depending on the hospital and location. While some public hospitals in Australia have adopted this technology, robotic systems are currently more widely available in the private sector. It’s best to check with your local hospital or specialist to confirm availability.
3. What kind of imaging or scans are needed before robotic surgery?
This depends on the robotic system used. Mako technology requires a CT scan of your knee before surgery to develop a 3D plan. VELYS, on the other hand, does not require any pre-operative scans and creates the model during the operation using live anatomical data.
4. Can I choose which robotic system will be used for my procedure?
The choice of robotic platform is typically made by your surgeon based on clinical factors, hospital setup, and surgical goals. In Sydney, Specialist Knee Surgeon Dr Jonathan Negus uses both Mako and VELYS systems, allowing flexibility to match the most appropriate technology to the patient’s needs.
5. What if I’m not suitable for robotic surgery? Are there still good options?
Yes. Robotic assistance is one of several tools available. If it’s not suitable for your situation, your surgeon may recommend a conventional knee replacement, arthroscopy, or joint preservation strategy. The goal remains the same: safe, personalised care tailored to your condition. Dr Negus will discuss all available options during your consultation.
