Robotic joint surgery promises greater precision, but two large UK studies found no better short-term outcomes than conventional knee and hip replacement.
Walk into many private hospitals in India today and you are likely to see advertisements for robotic knee and hip replacement. If a robot helps make the operation more precise, patients should recover better and their new joint should last longer.
Many patients have trusted that promise. But two large studies from the United Kingdom have now raised an important question. The research found that robotic knee and hip replacement did not produce better patient outcomes than conventional surgery.
The studies, published in The BMJ, analysed data from England's National Joint Registry. One study examined 666,283 hip replacements, including 10,203 performed with robotic assistance. The other covered 697,145 total or partial knee replacements, of which 22,111 were robotic procedures. The operations were performed in public and private hospitals between 2018 and 2024.
Comparing the two approaches is not straightforward because patients who undergo robotic surgery may differ from those who have conventional operations. To make the comparison more reliable, researchers matched patients according to factors including age, sex, body weight, diagnosis, general health, implant type and the surgeon's experience with the procedure.
After this adjustment, the researchers found no meaningful difference in implant survival, the need for further surgery or complications between robotic and conventional procedures. Patients were followed for an average of around two and a half years.
What Does the Robot Actually Do?
Robotic systems use computer-assisted technology, cameras and specialised instruments to help surgeons plan and perform joint replacement. They can help improve the precision of bone cuts and implant positioning.
The technical advantage is real. The studies did not argue otherwise.
The bigger question is whether greater precision translates into a better outcome for the patient. The new research found no evidence that it does, at least during the period covered by the studies.
That distinction matters because patients are not paying for precision on a computer screen. They are paying for a surgery that helps them walk better, reduces pain and gives them a reliable joint for many years.
The Cost of Robotic Surgery
Cost is another important part of the debate.
Robotic joint replacement has expanded rapidly in India, particularly in private hospitals, over the past decade. The researchers noted that a robotic system can cost around £1 million to purchase and may add approximately £1,000 to £2,500 to the cost of each operation.
The financial question becomes even more important when a technology is promoted as superior but does not yet have strong evidence showing better long-term outcomes.
The authors also examined the UK's plans to expand robotic surgery. The National Health Service intends to increase the use of robotic surgery substantially by 2035. The researchers argued that the evidence currently available does not justify assuming that robotic joint replacement produces better results than conventional surgery.
Doctors Have Raised Questions Before
Dr Shah Alam Khan, professor of orthopaedics at AIIMS, New Delhi, said the findings were not surprising.
According to him, doctors have long known that the benefits of robotic joint replacement are not necessarily as large as they are sometimes presented to patients. He also pointed to the role of commercial interests in the medical technology market.
Some robotic systems are linked to particular implant manufacturers. This can create a commercial relationship in which the sale of the robotic system and the sale of implants are connected.
It does not mean robotic surgery is ineffective. It does mean patients should separate technological sophistication from proven clinical benefit.
The Study Does Not Mean Robots Are Useless
The research has important limitations.
Both studies were observational. Researchers analysed existing surgical records rather than randomly assigning patients to robotic or conventional surgery. Observational studies can identify patterns and associations, but they cannot establish cause and effect as strongly as a randomised clinical trial.
There may also be factors affecting surgical outcomes that were not captured in the registry data.
More importantly, patients were followed for an average of only about two and a half years. Hip and knee replacements are expected to function for 15 to 20 years or longer. A technology could theoretically show benefits over a much longer period that are not visible in early follow-up.
Previous research has also suggested that robotic surgery may offer advantages in certain aspects of joint replacement. The researchers therefore say longer-term studies are needed before drawing final conclusions about its value over the lifetime of an implant.
What Should Patients Ask Before Surgery?
For someone considering a knee or hip replacement, the findings do not mean robotic surgery should automatically be rejected. They do suggest that patients should ask more questions before paying extra for it.
Start with the surgeon rather than the machine. Ask how many knee or hip replacements the surgeon performs and how experienced they are with the particular procedure.
Ask why robotic assistance is being recommended in your specific case. A patient should be able to understand what additional benefit the technology is expected to provide.
The cost should also be explained clearly. Find out how much the robotic system adds to the total bill and whether that additional expense is justified by a specific clinical advantage.
Patients should also ask about the implant being used, its track record and how long it has been in use. A second opinion can be useful, particularly when the recommendation comes with a substantially higher price.
Joint replacement can change how a person walks, climbs stairs and manages everyday life. In India, many patients already delay surgery because of cost, fear or uncertainty.
When a new technology comes with a higher price, patients have a reasonable right to ask for evidence that it will make a meaningful difference to their lives.
For now, the large UK registry studies offer a cautious message. Robotic assistance may make parts of joint replacement more precise, but greater precision has not yet translated into better short-term patient outcomes compared with conventional surgery.
For patients, the skill and experience of the surgeon may still matter more than whether a robot is standing beside the operating table.
Walk into many private hospitals in India today and you are likely to see advertisements for robotic knee and hip replacement. If a robot helps make the operation more precise, patients should recover better and their new joint should last longer.
Many patients have trusted that promise. But two large studies from the United Kingdom have now raised an important question. The research found that robotic knee and hip replacement did not produce better patient outcomes than conventional surgery.
The studies, published in The BMJ, analysed data from England's National Joint Registry. One study examined 666,283 hip replacements, including 10,203 performed with robotic assistance. The other covered 697,145 total or partial knee replacements, of which 22,111 were robotic procedures. The operations were performed in public and private hospitals between 2018 and 2024.
Comparing the two approaches is not straightforward because patients who undergo robotic surgery may differ from those who have conventional operations. To make the comparison more reliable, researchers matched patients according to factors including age, sex, body weight, diagnosis, general health, implant type and the surgeon's experience with the procedure.
After this adjustment, the researchers found no meaningful difference in implant survival, the need for further surgery or complications between robotic and conventional procedures. Patients were followed for an average of around two and a half years.
What Does the Robot Actually Do?
Robotic systems use computer-assisted technology, cameras and specialised instruments to help surgeons plan and perform joint replacement. They can help improve the precision of bone cuts and implant positioning.
The technical advantage is real. The studies did not argue otherwise.
The bigger question is whether greater precision translates into a better outcome for the patient. The new research found no evidence that it does, at least during the period covered by the studies.
That distinction matters because patients are not paying for precision on a computer screen. They are paying for a surgery that helps them walk better, reduces pain and gives them a reliable joint for many years.
The Cost of Robotic Surgery
Cost is another important part of the debate.
Robotic joint replacement has expanded rapidly in India, particularly in private hospitals, over the past decade. The researchers noted that a robotic system can cost around £1 million to purchase and may add approximately £1,000 to £2,500 to the cost of each operation.
The financial question becomes even more important when a technology is promoted as superior but does not yet have strong evidence showing better long-term outcomes.
The authors also examined the UK's plans to expand robotic surgery. The National Health Service intends to increase the use of robotic surgery substantially by 2035. The researchers argued that the evidence currently available does not justify assuming that robotic joint replacement produces better results than conventional surgery.
Doctors Have Raised Questions Before
Dr Shah Alam Khan, professor of orthopaedics at AIIMS, New Delhi, said the findings were not surprising.
According to him, doctors have long known that the benefits of robotic joint replacement are not necessarily as large as they are sometimes presented to patients. He also pointed to the role of commercial interests in the medical technology market.
Some robotic systems are linked to particular implant manufacturers. This can create a commercial relationship in which the sale of the robotic system and the sale of implants are connected.
It does not mean robotic surgery is ineffective. It does mean patients should separate technological sophistication from proven clinical benefit.
The Study Does Not Mean Robots Are Useless
The research has important limitations.
Both studies were observational. Researchers analysed existing surgical records rather than randomly assigning patients to robotic or conventional surgery. Observational studies can identify patterns and associations, but they cannot establish cause and effect as strongly as a randomised clinical trial.
There may also be factors affecting surgical outcomes that were not captured in the registry data.
More importantly, patients were followed for an average of only about two and a half years. Hip and knee replacements are expected to function for 15 to 20 years or longer. A technology could theoretically show benefits over a much longer period that are not visible in early follow-up.
Previous research has also suggested that robotic surgery may offer advantages in certain aspects of joint replacement. The researchers therefore say longer-term studies are needed before drawing final conclusions about its value over the lifetime of an implant.
What Should Patients Ask Before Surgery?
For someone considering a knee or hip replacement, the findings do not mean robotic surgery should automatically be rejected. They do suggest that patients should ask more questions before paying extra for it.
Start with the surgeon rather than the machine. Ask how many knee or hip replacements the surgeon performs and how experienced they are with the particular procedure.
Ask why robotic assistance is being recommended in your specific case. A patient should be able to understand what additional benefit the technology is expected to provide.
The cost should also be explained clearly. Find out how much the robotic system adds to the total bill and whether that additional expense is justified by a specific clinical advantage.
Patients should also ask about the implant being used, its track record and how long it has been in use. A second opinion can be useful, particularly when the recommendation comes with a substantially higher price.
Joint replacement can change how a person walks, climbs stairs and manages everyday life. In India, many patients already delay surgery because of cost, fear or uncertainty.
When a new technology comes with a higher price, patients have a reasonable right to ask for evidence that it will make a meaningful difference to their lives.
For now, the large UK registry studies offer a cautious message. Robotic assistance may make parts of joint replacement more precise, but greater precision has not yet translated into better short-term patient outcomes compared with conventional surgery.
For patients, the skill and experience of the surgeon may still matter more than whether a robot is standing beside the operating table.
Leave a Comment