Robotic knee replacement is the upgrade many people now ask about first. The robot does make the bone cuts more precise. What the best recent evidence has not shown is that this precision leaves you with a better knee, at least in the first year or two.
That matters if you are paying cash, because robotics adds cost somewhere in the chain. This guide covers what these systems actually do, what the 2026 trial and registry data found, what is publicly known about robotic knee surgery in Colombia, and the questions that tell you whether the robot is worth anything in your specific case.
What a "robotic" knee replacement actually is
The robot does not operate on its own. A surgeon still makes the incision, balances the soft tissues and decides where the implant goes. The robotic system is a guidance and control tool: it holds the plan for each bone cut and keeps the saw or burr within the boundaries of that plan.
Systems differ in how they build the plan. Mayo Clinic describes its Mako process as starting with a CT scan before surgery, which is used to plan how much bone to remove and how to position the implant; during surgery the arm gives the surgeon tactile, visual and audio feedback to keep to that plan.1 Not every system plans from a CT scan, so ask what imaging yours needs. Across platforms, the goal is the same: hit the planned alignment more reliably than hand-guided instruments.
The names you will see on quotes
Most robotic knee work worldwide uses one of a handful of platforms. Stryker's Mako is the best known, and DePuy Synthes, Zimmer Biomet and Smith+Nephew sell competing systems.2 On quotes you may see them as VELYS (DePuy Synthes), ROSA (Zimmer Biomet) and CORI (Smith+Nephew). Because each platform comes from an implant manufacturer, ask whether the robot limits which implant you can get. If you want to understand what that implant choice involves, our guide to knee replacement implant types walks through the main design differences.
What the evidence shows: precision yes, better knees not yet
The strongest evidence so far comes from one large randomized trial and two big registries. They point in the same direction.
RACER-Knee: the largest randomized trial (UK, 2026)
RACER-Knee randomly assigned 339 patients at 10 UK hospitals, operated on by 33 surgeons, to either a Mako-assisted total knee replacement or a conventional one. Patients did not know which they had received.3 The results were published in The Lancet in August 2026.
The main outcome was the Forgotten Joint Score at 12 months, a questionnaire measuring how often you are still aware of the knee in daily life. The robotic group scored 49.2 and the conventional group 50.2, with an adjusted difference of −1.5 points and a confidence interval running from −7.5 to 4.5. In plain terms: no meaningful difference.4 Walking ability, pain at three and 12 months, in-hospital pain and the likelihood of a further operation were also comparable.3
The robot did deliver what it promises mechanically. On average the final alignment was 2.0 degrees off the plan with robotics versus 2.8 degrees with conventional instruments.4 That improvement on the X-ray did not translate into patients feeling or functioning better at one year.5
On safety, 16 participants in each arm had a serious adverse event, so robotics did not add risk.4 Two caveats keep this from being the final word: the trial used one system (Mako), and patients will be followed for 10 years to see whether loosening or revision rates diverge later.5
UK National Joint Registry: almost 700,000 knees
A September 2026 study in The BMJ used UK National Joint Registry data from 2018 to 2024, covering 697,145 total or partial knee replacements, of which 22,111 were robotic. After matching patients on age, BMI, diagnosis, fitness, implant type and surgeon volume, the researchers found no difference in implant survival, revision risk or surgical complications over an average of about 2.5 years.6 This is observational data, so it cannot rule out hidden differences between groups, and it did not measure how patients felt.
American Joint Replacement Registry
A study presented at the American Academy of Orthopaedic Surgeons meeting in 2024 looked at 9,220 cementless total knees in the US registry, nearly half done robotically. Two-year revision rates were similar, with no statistically significant difference for all-cause revision, infection or loosening.2 The authors noted a gap: around 60% of registry records did not say whether a robot was used.
| Question | Finding | Source |
|---|---|---|
| Is the alignment more accurate? | Yes. Average deviation from plan 2.0° robotic vs 2.8° conventional | RACER-Knee RCT4 |
| Does the knee feel better at 1 year? | No meaningful difference (Forgotten Joint Score 49.2 vs 50.2) | RACER-Knee RCT4 |
| Is it safer? | Equally safe: 16 serious adverse events in each group | RACER-Knee RCT4 |
| Do implants last longer? | No difference in revision at about 2.5 years | UK registry, 697,145 knees6 |
| Fewer early revisions in the US? | No significant difference at 2 years | US registry, 9,220 knees2 |
| Does it take longer? | About 10.5 extra minutes in surgery | RACER-Knee3 |
Robotics is a precision tool that works as designed. Current evidence says it is about as safe as conventional surgery and no better for function or early implant survival. Long-term data, especially on revision at 10 years, is still being collected.
Cost: who pays for the precision
Robots are expensive to buy and to run. The authors of the BMJ registry study put the upfront cost of a system at around £1 million, plus an extra £1,000 to £2,500 per patient.6 In RACER-Knee, the robotic pathway cost roughly £950 more per case and was not cost-effective for the UK's NHS over the first year.3
Those are UK health-system figures, not prices you will be quoted. For a cash patient, the robot's cost shows up in one of three ways: a separate "robotic surgery" line, a higher package price, or a higher implant charge if the platform limits you to one maker's components. We have not found published Colombian prices that separate robotic from conventional knee replacement. If a quote is robotic, ask for the robotic premium in writing as its own line so you can compare it against a conventional quote from the same surgeon or hospital.
For general Colombian knee pricing and how to compare packages, see our sister site Colombia Orthopedics, and use our joint replacement quote packet so every quote you collect covers the same items.
Where Colombia fits: what is publicly documented
Robotic joint replacement in Colombia is relatively new, and public information is thin. Here is what we could document from dated reports.
- December 2022: Colombian national radio reported the first Mako-assisted knee and hip replacements in the country, at a hospital in Barranquilla.7
- October 2023: Colombian health trade press reported that the Mako system had arrived in Colombia for knee and hip replacement, starting in Barranquilla, with other cities expected to follow.8
- July 2025: A hospital in Santander reported performing more than 300 orthopedic surgeries with Mako since 2023, including total knee and hip replacements, and added robotic partial (unicompartmental) knee replacement that year.9
We were not able to confirm these programs on the hospitals' own websites, and in our research we did not find an official hospital page in Medellín or Bogotá listing robotic knee replacement as of October 2026. That does not mean none exists. Programs start, pause and change systems, and press reports age quickly. We are not naming specific hospitals here because we could not verify current availability from an official source, and nothing on this page is an endorsement.
If a Colombian clinic tells you a robot will be used, ask for the system name, the hospital where it is installed, and how many robotic knees your specific surgeon has performed. Confirm the surgeon's license in the ReTHUS registry and the hospital's accreditation separately. A robot is not a substitute for those checks.
When robotic assistance probably doesn't matter
For a typical first-time total knee replacement in an otherwise healthy adult, the evidence above suggests your outcome will depend far more on the surgeon, the implant, infection control and your rehab than on whether a robot guided the cuts. Mayo Clinic itself notes that the robotic approach will not benefit every patient.1
Robot is probably not decisive if
- You are having a routine primary total knee
- Your surgeon's conventional results and volume are strong
- The robotic option costs more or limits your implant choice
- It would require choosing a less experienced surgeon
Worth a deeper conversation if
- Your surgeon routinely uses it and has a large robotic series
- You are being offered a partial knee and the surgeon explains why the robot helps
- There is no price difference between the two options
- Your surgeon can explain what it changes for your anatomy specifically
The key trade-off, in our reading of the evidence: an experienced surgeon doing conventional surgery is a better bet than a less experienced surgeon with a robot. If you are still deciding between a partial and a total knee, read total vs partial knee replacement: the questions to ask first; that decision matters more than the robot.
Questions to ask about robotic knee replacement
- Which robotic system is it, and which implant does it require?
- How many robotic knee replacements have you personally done, and for how long?
- Do you also do conventional knees, and how do your results compare?
- Why do you recommend the robot for my knee specifically?
- Does the system need a pre-op CT scan? Is that scan included in the quote?
- What is the price difference between robotic and conventional, as a separate line?
- If the robot malfunctions on the day, what happens and does the price change?
- Will I get my implant stickers or record for my files? (Our implant record passport shows what to keep.)
How to decide, step by step
- Pick the surgeon and hospital first. Volume, verified credentials, accreditation and infection-control practices matter more than any device.
- Ask for two quotes from the same team. One robotic, one conventional, with the difference listed as a line item.
- Ask what the robot changes in your case. A specific answer about your anatomy is better than a general claim about precision.
- Weigh the premium against the evidence. At present, extra spending buys alignment accuracy, not proven better function or longer implant life.
- Get everything in writing. System name, implant brand and model, and what is included. If you want help structuring the comparison, you can request a quote and we will tell you what each line should include.
Robotic knee replacement is a reasonable choice when an experienced surgeon uses it routinely and it doesn't cost you meaningfully more. It is not a reason to pay a large premium, travel farther, or trade down on surgeon experience. Revisit the question as the 10-year RACER data and longer registry follow-up come in.