Introduction
Knee care · Knee arthritis
Robotic vs conventional knee replacement: what the evidence shows
Dr Sean Leo
Written by Dr Sean Leo, a consultant orthopaedic surgeon whose clinical focus is the knee, sports injuries and the lower limb.
Last updated: 15 October 2026.
Robotic-assisted and conventional knee replacement are two ways of performing the same operation. Robotic assistance adds a 3D plan and computer-guided bone preparation, which makes implant placement measurably more accurate. Current evidence shows similar function, outcomes and complication rates in the short term, and long-term superiority has not been established [1] [3].
This page sets out the evidence in both directions.
Take-home: Robotic assistance is a technique option, not a guarantee of a better result. The evidence shows more precise alignment, similar short-term outcomes, and no established long-term superiority [1] [3].
Dr Sean LeoOrthopaedic Surgeon, Singapore
Clinic enquiries · Not an emergency service
Illustrative image
Is robotic knee replacement a different operation
Is robotic knee replacement a different operation
Is robotic knee replacement a different operation?
No. In both approaches the surgeon replaces the damaged surfaces of the knee joint with artificial components. This is total knee replacement (TKR, also called total knee arthroplasty).
Robotic assistance supports the precision of certain steps, such as alignment and bone preparation [2]. It is one of several ways the procedure can be carried out, not a separate operation. Your surgeon still performs the surgery. Technology supports a plan; it does not replace one.
What’s covered on this webpage
Follow the route in order, or jump to the stop you need. Stops you have read are marked.
What does robotic assistance actually add
What does robotic assistance actually add
What does robotic assistance actually add?
A detailed plan, and guidance while the bone is prepared.
- The system builds a 3D model of the knee, which allows personalised planning [2]. Some systems plan from a CT scan taken before surgery (the Mako system is one example). Others, called imageless systems, build the model during the operation without a scan [2].
- During bone preparation, the system gives real-time feedback while the surgeon keeps the cuts within the planned boundaries [2].
Two practical points follow. The systems NICE evaluated are all “closed”, which means each works only with that company’s implants [2]. Some also need a pre-operative CT scan [2]. These are points to discuss with your surgeon.
How do the two approaches compare side by side
How do the two approaches compare side by side
How do the two approaches compare side by side?
| Conventional | Robotic-assisted | |
|---|---|---|
| What is the same | Joint surfaces replaced with artificial components | Joint surfaces replaced with artificial components |
| Planning | Planned from X-rays | 3D plan, from a CT scan or built during surgery [2] |
| Bone preparation | Mechanical cutting guides | Cuts guided within planned boundaries [2] |
| Alignment accuracy | Set with mechanical guides | More accurate in trials, largely with older systems [3] |
| Short-term function and complications | No significant difference found [1] [3] | No significant difference found [1] [3] |
| Longer-term results | Decades of registry data; around eight in ten knee replacements still working at 25 years [7] | Long-term superiority not established [1] [3] [4] |
| Practical points | No platform needed | Often tied to one company’s implants; may need a CT scan; availability varies [2] |
| What the choice does not decide | Whether you need a replacement | Whether you need a replacement |
What does the evidence show?
What does the evidence show?
What does the evidence show?
Robotic assistance places the implant more precisely, but research has not shown that this leads to better results for patients.
Alignment. A 2024 analysis of seven randomised trials (1,942 knees) found more accurate alignment after robotic surgery [3]. Alignment means how precisely the implant sits along the weight-bearing line of the leg, measured on X-rays. Five of the seven trials used an older robotic system, so the findings may not fully apply to today’s platforms [3]. An X-ray measure does not tell us how the knee feels.
Function and complications. The 2022 AAOS guideline found no significant short-term difference in function, outcomes or complications [1]. The 2024 trial analysis likewise found similar clinical and functional outcomes and complication rates [3]. A second 2024 analysis of nine trials gave a mixed picture. WOMAC scores (a standard questionnaire on knee pain, stiffness and function) were better with robotic surgery, while bending range was better with conventional surgery in the long term. Its authors say more data are needed [4].
Revision. Early Australian registry data, as reported in a secondary source, showed a small difference in revision favouring robotic surgery at three and five years, which was no longer significant after adjusting for other factors [6]. A separate registry analysis found lower revision with technology-assisted surgery only among surgeons performing fewer than 50 knee replacements a year [5]. These are observational data. They cannot show that robotic assistance prevents revision.
Guidelines. NICE in England allows six robotic systems in the NHS while three years of further evidence is gathered. Its early modelling suggested they may not be cost effective for knee replacement [2]. That is conditional use, not routine endorsement. NICE also notes a surgeon and centre learning curve associated with robot-assisted surgery [2].
The baseline is already strong. Registry data show around eight in ten knee replacements still working at 25 years [7], a figure for groups of patients, not a promise for any one person.
The usual risks of knee replacement apply to both approaches, including infection, blood clots, stiffness, ongoing pain in a minority of people, and a possible later revision. Most people improve, but not all, whichever technique is used. The total knee replacement page covers these risks in full.
Who might robotic assistance suit?
Who might robotic assistance suit?
Who might robotic assistance suit?
That is a decision for the surgical discussion. The structure of your knee, you as a person, and the goal you want to return to all count.
One use is described in carefully selected cases. After earlier knee surgery, such as fracture fixation, or where hardware has been left in place or the bone is deformed, the usual cutting guides can be hard to apply, because landmarks may be unreliable. Robotic planning can help guide the bone cuts where those guides cannot be used [8]. This may offer a technical advantage in difficult anatomy, not evidence of a better result or a longer-lasting implant. The total knee replacement page says more.
Robotic assistance is also used in partial knee replacement [2]. Whether partial or total replacement suits you is a separate question, covered in partial or total knee replacement.
What questions are worth asking your surgeon
What questions are worth asking your surgeon
What questions are worth asking your surgeon?
- Which system would be used, and why?
- Is it image-based or imageless? Do I need a CT scan beforehand?
- How would robotic assistance change my plan, if at all?
- What does the evidence support for a knee like mine?
- What costs are involved, and what might my insurance cover?
Questions people often ask
Common questions
Frequently asked questions
Is robotic knee replacement better than conventional knee replacement?
It places the implant more precisely. A major clinical practice guideline found no significant short-term difference in function, outcomes or complications, and long-term superiority is not established [1] [3] [4]. It is a technique option, not a premium outcome promise.
Is robotic surgery available in Singapore?
It is not available at every medical facility. Ask your care team what is available to you.
When is urgent help needed?
When is urgent help needed?
When is urgent help needed?
Signs that need urgent help
Some symptoms should not wait for a routine appointment. Each item below says where to go.
After an injury
- The kneecap has slipped out of place and is still out, or the knee looks deformed. Go to an emergency department. If the kneecap went back into place by itself, arrange an early assessment.
- The leg looks twisted or bent, a bone is showing, there is a deep cut, or the foot or leg turns cold, pale, numb, blue or white. Go to an emergency department or call 995.
- You cannot lift your leg up with the knee kept straight, and you may feel a gap just above or just below the kneecap. Arrange an urgent same-day assessment.
At any time
- The knee is stuck and will not straighten, or it is very painful and you cannot move it or put weight on it. Arrange an urgent same-day assessment.
- The knee is suddenly very painful, hot, red and swollen, especially with a fever or feeling generally unwell. Go to an emergency department or call 995.
- One calf or thigh is newly painful and swollen. Arrange an urgent same-day assessment. If you also feel short of breath or have chest pain, call 995.
After knee surgery
- The operated knee becomes more painful, swollen or red, a wound is leaking, or you develop a fever. Contact your surgical team straight away. If you cannot reach them the same day, go to an emergency department. If you feel very unwell, go to an emergency department. If you are short of breath or have chest pain, call 995.
If you are admitted by the doctor at the urgent care centre of one of these private hospitals, the Parkway Pantai hospitals (Mount Elizabeth Orchard, Mount Elizabeth Novena, Gleneagles and Parkway East), Farrer Park Hospital and Thomson Medical Centre, you may ask for Dr Sean Leo to be your attending orthopaedic surgeon. If you are instead discharged and referred for orthopaedic follow-up, you may contact the clinic to arrange an appointment. Both are subject to the hospital’s admission processes and to Dr Leo’s availability.
With you through the seasonsMeet Dr Sean Leo
Meet Dr Sean Leo
A consultant orthopaedic surgeon whose clinical focus is the knee, sports injuries and the lower limb.
- Dr Sean Leo is a consultant orthopaedic surgeon. OrthoKinetics is his professional brand; clinical services are provided through OrthoSports Orthopaedic & Sports Surgery at Mount Elizabeth Novena Specialist Centre and Connexion, Farrer Park Hospital.
- His clinical interests include sports injuries, including those in adolescent athletes; ligament reconstruction; realignment surgery; cartilage repair and joint-preservation approaches; knee replacement; and technology-assisted hip and knee surgery.
- The consistent aim is to return people to meaningful function and activity while avoiding unnecessary downtime.
- Qualifications: MBBS, MRCS (Ed), MMed (Ortho), FRCSEd (Ortho).
More detail: Meet Dr Sean Leo
- Training and career: Dr Leo trained in medicine at the National University of Singapore and served in the Singapore Armed Forces Medical Corps from 2000 to 2012, where his work included the care of soldiers in physically demanding roles. He completed postgraduate orthopaedic training in 2009 and a one-year clinical fellowship at Royal North Shore Hospital in Sydney, Australia, before joining Changi General Hospital as an orthopaedic consultant in 2012, where he later held the positions of Senior Consultant and Director of the Hip and Knee Service. With seniority, his educational contribution has evolved towards mentorship and support for junior doctors.
What should I do next?
What should I do next?
What should I do next?
If you are weighing a knee replacement, an assessment is a sensible next step. It brings together your story, an examination and any tests that help. It looks at the structure involved, you as a whole person and the goal you want to return to. Where robotic assistance is available and suitable, you and your surgeon choose together. An appointment supports an informed decision. It is not a commitment to surgery.
- Read about total knee replacement surgery.
- Watch robotic-assisted total knee replacement: 3D planning explained.
- Compare partial or total knee replacement.
- Browse the Knee Hub for other knee problems.
- Read more about Dr Sean Leo, who is named as the author of this page.
- Arrange a knee assessment when you are ready.
This page provides general information and cannot diagnose an individual condition. OrthoKinetics does not provide emergency or urgent care through this webpage or its WhatsApp contact.
Sources
References
References
- American Academy of Orthopaedic Surgeons. Surgical Management of Osteoarthritis of the Knee: Evidence-Based Clinical Practice Guideline, 2nd edition. 2022. https://www.aaos.org/smoak2cpg
- National Institute for Health and Care Excellence. Robot-assisted surgery for orthopaedic procedures: early value assessment (HTG743). https://www.nice.org.uk/guidance/htg743
- Alrajeb R, et al. Robotic-assisted versus conventional total knee arthroplasty: a systematic review and meta-analysis of randomized controlled trials. Eur J Orthop Surg Traumatol. 2024. doi:10.1007/s00590-023-03798-2. PMID:38133653.
- Daoub A, et al. Robotic assisted versus conventional total knee arthroplasty: a systematic review and meta-analysis of randomised controlled trials. J Robot Surg. 2024. PMID:39382767.
- Association of Technology Usage and Decreased Revision TKA Rates for Low-Volume Surgeons Using an Optimal Prosthesis Combination: An Analysis of 53,264 Primary TKAs. J Bone Joint Surg Am. 2024. doi:10.2106/JBJS.24.00539. PMID:39325857.
- Australian Orthopaedic Association National Joint Replacement Registry. Annual Report 2023, as reported in the Canadian Orthopaedic Association bulletin, June 2025. https://coa-aco.org/coa-bulletins/june-2025-edition/industry-advancements (industry-sponsored bulletin content)
- Evans JT, et al. How long does a knee replacement last? Lancet. 2019. PMID:30782341.
- Vu DN, Nguyen TT, Pham TN, Nguyen TT, Vu DA. Robotic-assisted total knee arthroplasty in post-traumatic and previously operated knees with retained hardware: Practical decision-making workflow. J Robot Surg. 2026;20(1):603. doi:10.1007/s11701-026-03586-0. PMID:42319395.
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