Surgical Robots: What They Replace, What They Don't, and What's Next

The Intuitive Surgical da Vinci system has been used in more than 10 million surgical procedures. Stryker Mako is transforming orthopaedic outcomes in knee and hip replacement. Accuray CyberKnife is the standard of care for certain radiation oncology applications. These are not pilot programmes or research demonstrations. They are established clinical infrastructure in hospitals across every developed healthcare market.

The frame of "surgical robots as emerging technology" was accurate in 2000. It is not accurate in 2026. The relevant questions are not whether surgical robots work — outcomes data across millions of procedures answers that — but what they replace, what they cannot replace, and where the technology is going next.

For the broader context: Robot Augmentation, Not Replacement and Will Robots Replace Nurses?. Surgical workforce displacement data: Emergency Room Surgeon on the Geppetto Jobs Index.

What Surgical Robots Replace

The answer is not the surgeon. The answer is open surgery.

In traditional open surgery, accessing an internal surgical site requires a large incision — large enough for the surgeon's hands, instruments, and visual access. That incision has consequences: significant blood loss, post-operative pain, high infection risk, lengthy recovery.

Robotic surgery replaces that access model with small port incisions through which robotic instruments and a camera are introduced. The surgeon operates the robot from a console, viewing a magnified, high-definition three-dimensional image of the operative field. The robot's instruments have a range of motion exceeding the human wrist, operate in confined spaces hands cannot reach, and filter out natural hand tremor.

What this delivers clinically: smaller incisions, significantly reduced blood loss, shorter hospital stays, faster return to normal activity, reduced infection risk, and equal or superior oncological outcomes in documented procedure categories.

The surgeon is still operating. They are making every decision, controlling every instrument movement, and bearing full clinical responsibility. The robot is an instrument system — extraordinarily capable, but an instrument.

The Procedures Surgical Robots Have Transformed

Intuitive Surgical da Vinci Xi

Robotic-assisted radical prostatectomy using the da Vinci system now accounts for more than 80% of radical prostatectomies in the United States — the clearest example of a robotic platform achieving procedural dominance through accumulated clinical evidence. The Xi is the current flagship multi-port system, with four robotic arms, integrated fluorescence imaging, and a redesigned arm architecture for multi-quadrant abdominal and pelvic access. Applications span urology, gynaecology, colorectal surgery, thoracic surgery, and general surgery.

Compare: da Vinci Xi vs CMR Versius | da Vinci Xi vs Stryker Mako

CMR Surgical Versius

Versius is the primary commercial challenger to da Vinci in soft-tissue robotic surgery. Its modular design allows individual arms to be positioned independently, giving theatre teams more flexibility in positioning. Deployed across the UK NHS, European, and Asian markets.

Stryker Mako

Mako is a robotic-arm-assisted orthopaedic system for total knee, total hip, and partial knee replacement. Pre-operative CT imaging creates a patient-specific plan; the robotic arm constrains the surgeon's cutting instrument to planned boundaries during surgery. Outcome: implant positioning accuracy that consistently exceeds manual technique, with documented reductions in alignment outlier rates and improved patient-reported outcomes.

Compare: Mako vs da Vinci Xi

Accuray CyberKnife M6

CyberKnife M6 delivers precisely targeted radiation beams from multiple non-coplanar angles, with real-time imaging that tracks target movement including respiratory motion. For brain metastases, spinal tumours, prostate cancer, and certain lung tumours, CyberKnife SBRT has replaced both open surgery and conventional fractionated radiotherapy as the preferred approach in defined clinical scenarios. Treatment in one to five sessions versus 25–40 for conventional radiotherapy. The beam delivery is fully autonomous within a clinician-designed treatment plan.

Stereotaxis Genesis

Genesis is a robotic navigation system for cardiac electrophysiology, steering flexible catheters through cardiac chambers using magnetic fields with precision exceeding manual manipulation. Deployed in electrophysiology laboratories for complex ablation procedures treating atrial fibrillation and ventricular tachycardia.

What the Outcomes Data Actually Shows

Where evidence is strongest: Radical prostatectomy (consistent evidence for improved continence and potency outcomes); total knee/hip replacement via Mako (consistent evidence for improved implant positioning accuracy); stereotactic radiosurgery (consistent tumour control with reduced toxicity versus conventional radiotherapy); hysterectomy and myomectomy (reduced blood loss and shorter hospitalisation across multiple meta-analyses).

Where evidence is more equivocal: Colorectal surgery (some meta-analyses show equivalent outcomes to laparoscopic surgery at significantly higher cost); cost-effectiveness analyses vary by health system and procedure.

What the evidence does not show: That surgical robots perform procedures without surgeon input, that outcomes are uniformly superior to expert laparoscopic surgery in all settings, or that the technology eliminates adverse outcomes.

What Surgical Robots Cannot Replace

Surgical judgment: Whether to operate, which approach to use, how to respond to unexpected anatomy, whether to convert to open surgery — these require clinical judgment no current robotic system exercises.

Patient communication: Pre-operative assessment, informed consent, explaining risks, post-operative communication. Entirely human functions.

Complication management: Intra-operative complications — unexpected bleeding, anomalous anatomy, unexpected findings — require contextual adaptive decision-making that robots do not have.

Emergency surgery: High-complexity emergencies require speed and adaptability that does not fit robotic surgery's setup requirements.

Complex unstructured anatomy: Procedures involving severely distorted anatomy from previous surgery, tumour involvement of major structures, or rare anatomical variants.

The Autonomous Surgery Question

The most significant demonstration of autonomous surgical capability to date is the Smart Tissue Autonomous Robot (STAR), developed at Johns Hopkins, which in 2022 performed laparoscopic intestinal anastomosis autonomously in a pig model, outperforming human surgeons on specific consistency metrics.

This is a genuine research milestone. It is also a controlled demonstration on a single procedure in a pig model. The gap between this and autonomous clinical surgery in human patients is not primarily technological — it is a regulatory, liability, and ethical framework gap without a near-term resolution path. Fully autonomous surgery in clinical settings is decades away.

The nearer-term trajectory is autonomous execution of defined sub-tasks within surgeon-led procedures: robotic systems that autonomously perform specific steps — stapling, suturing, knot-tying — while the surgeon supervises and manages the overall procedure.

What's Next

Haptic feedback: The most significant current limitation. Surgeons operating da Vinci or Versius cannot feel tissue resistance, suture tension, or instrument force. They compensate visually, but this is a real loss versus open surgery. Multiple platforms are developing force and tactile feedback systems. Restoring haptic feedback is the single most impactful near-term improvement the field can make.

AI-guided procedure assistance: Real-time AI analysis of the surgical camera feed to identify structures at risk, alert to anatomical variations, and provide guidance cues. Several platforms are integrating this capability.

Miniaturisation: Single-port and endoluminal robotic systems that enter the body through natural orifices or a single small incision, opening procedure categories current systems cannot access.

Cost reduction: The da Vinci's capital cost ($1.5–2.5 million) limits robotic surgery to well-resourced hospitals. Systems like Versius and new entrants are explicitly targeting lower price points to broaden access.

The Cricket's Assessment

> Intuitive Surgical has a gross margin above 70% and a near-monopoly on robotic surgery. The da Vinci is not the best surgical robot that could exist. It is the surgical robot with 10 million procedures of outcomes data, trained surgeons in every major hospital, and a service network that competitors cannot easily replicate. CMR Versius has better hardware in some respects. Switching costs are real. > > This matters for the competitive analysis but not for the clinical question. The clinical question is whether robotic-assisted surgery produces better patient outcomes than the alternative in a given procedure category. For prostatectomy, the data are clear. For colorectal surgery, more equivocal. For orthopaedic replacement via Mako, the implant positioning data are compelling. Evaluate by procedure type and outcomes metric, not by platform marketing. > > The absence of haptic feedback is an under-reported limitation. Surgeons who trained on open surgery have lost something real when they move to robotic surgery — the sense of tissue resistance, the feel of a suture under tension. The next generation of systems that restore this will represent a more significant clinical advance than the incremental camera and instrument improvements dominating current product cycles.

Frequently Asked Questions

How many surgical procedures use robots?

The Intuitive Surgical da Vinci system alone has been used in more than 10 million procedures globally, with approximately 1.5–2 million procedures performed annually. Stryker Mako has been used in millions of orthopaedic replacement procedures. Collectively, robotic surgery platforms perform millions of procedures annually across surgical specialties in hospitals in over 60 countries.

Does a robot surgeon operate independently?

No. In all commercially deployed surgical robot systems, a trained human surgeon controls the robot throughout the procedure. The da Vinci, Versius, and Mako systems have no autonomous operative capability — every instrument movement is directed by the surgeon. CyberKnife executes a pre-planned radiation treatment autonomously, but the treatment plan is designed by the clinical team and supervised throughout. Fully autonomous surgery remains in research stages.

What is Stryker Mako and how does it work?

Mako is a robotic-arm-assisted system for orthopaedic joint replacement. Before surgery, CT imaging of the patient's specific anatomy creates a personalised pre-operative plan specifying exact implant position and bone cut boundaries. During surgery, the robotic arm constrains the surgeon's cutting instrument to planned boundaries, preventing unintended bone removal. The result is implant positioning accuracy that consistently exceeds manual technique, with documented improvements in alignment outlier rates.

What is CyberKnife and who is it for?

Accuray CyberKnife delivers precisely targeted radiation from a robotic arm that positions the beam from hundreds of non-coplanar angles. Real-time imaging tracks target position including respiratory motion. Appropriate indications include brain metastases, spinal tumours, localised prostate cancer, and early-stage lung cancer. Treatment is typically one to five sessions versus 25–40 for conventional radiotherapy.

Why doesn't robotic surgery have haptic feedback?

Current generation systems including da Vinci and Versius do not transmit force or tactile information from instrument tips to the surgeon's hands. The technical challenge is transmitting accurate, appropriately scaled force feedback through a robotic system without instability or latency. Force feedback surgical robotics exists in research settings but is not commercially deployed at scale.

What procedures is robotic surgery used for?

Established procedure categories include: urology (radical prostatectomy, partial nephrectomy), gynaecology (hysterectomy, myomectomy), colorectal surgery (low anterior resection, colectomy), thoracic surgery (lobectomy), orthopaedics (total and partial knee/hip replacement via Mako), cardiac electrophysiology (catheter ablation via Stereotaxis Genesis), and radiation oncology (brain, spine, prostate, lung tumours via CyberKnife).

When will fully autonomous surgery be available?

Not within the foreseeable clinical horizon for complex procedures. The 2022 STAR robot demonstration at Johns Hopkins — autonomous intestinal anastomosis in a pig model — is the most significant milestone to date. The gap to clinical deployment is not primarily technological; it is regulatory, liability, and ethical. Autonomous execution of defined sub-tasks within surgeon-led procedures is the near-term trajectory.

The Geppetto directory covers surgical robots and medical robotics platforms with full specifications, procedure indications, and deployment data.