Robotic hip replacement matched conventional surgery on implant survival, with fewer malposition revisions

Design

Target trial emulation using national registry data, propensity matched

Population

666,283 total hip replacements (10,203 robotic), UK, 2018–2024

Primary outcome

Five-year implant survival and revision risk

Effect

98.8% vs 98.8%; all-cause revision HR 0.96 (0.75–1.22); malposition HR 0.53 (0.30–0.93)

Using the National Joint Registry for England, Wales, Northern Ireland and the Crown dependencies, this study emulated a target trial of 666,283 total hip replacements done between 2018 and 2024, of which 10,203 were robotic. Propensity matching created comparable groups, with a mean follow-up of 2.5 years.

Five-year implant survival was 98.8% in both groups, and all-cause revision risk did not differ (HR 0.96, 0.75–1.22). Intraoperative complications and patient survival were also similar. The one difference was in revisions for malposition — dislocation, leg-length discrepancy and malalignment — which were about half as frequent after robotic surgery (HR 0.53, 0.30–0.93).

This is the kind of evidence every clinician meets when a new technology arrives: no difference in the outcome that matters most, a benefit in a narrower outcome, and a much higher cost. It is observational, early and open to confounding by which surgeons and patients chose robots.

• When patients ask about robotic hip replacement, five-year implant survival was the same as conventional surgery.
• Fewer revisions for dislocation or leg-length problems were seen with robotic surgery, but these events were uncommon either way.
• Surgeon experience and case selection may explain part of the difference in this observational data.
• Higher cost has not yet been shown to buy better overall outcomes.

Why it matters

It sets a realistic expectation for patients who assume newer means better.

Don't overread it

With 2.5 years' average follow-up, this cannot speak to long-term implant survival.

The statistics, in plain English

A hazard ratio of 0.53 for malposition revision has an upper limit of 0.93, close to no effect, and rests on few events. The near-identical survival figures with narrow intervals are the more robust finding.

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