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Improvements in acetabular positioning seen with robotic-assisted THA during learning curve
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Investigators of this study found robotic techniques compared with fluoroscopy guidance in total hip arthroplasty yielded significant, immediate improvements in acetabular component positioning during the learning curve.
Researchers performed a retrospective study on three types of total hip arthroplasties (THAs) between 2008 and 2014. One hundred of the procedures were robotic-assisted posterior-approach THAs performed by principal investigator, 100 were fluoroscopy-guided direct-anterior approach THAs performed by senior investigators and each investigator also performed 100 manual posterior THAs. Radiographs were used to measure component position. Investigators calculated the percentage of hips in each surgeon’s “target zone” and “safe zone” of Lewinnek and Callanan, as well as the relative risk reduction and absolute risk reduction. Variability of cup position was described with variances.
Results showed 76% of manual posterior THAs were in the “target zone,” while 84% of fluoroscopic anterior THAs and 97% of robotic-assisted posterior THAs were in the “target zone.” Investigators noted the 87% relative risk reduction for robotic-assisted THA vs. manual posterior THAs was statistically significant. Robotic-assisted THAs compared with fluoroscopic anterior THAs had a relative risk reduction of 81%.
According to researchers, the robotic-assisted THAs had lower acetabulum inclination variances and anteversion variances compared with both the fluoroscopic anterior THAs and manual posterior THAs. Differences amongst the three THAs were statistically significant. ‒ by Monica Jaramillo
Disclosures: Kamara reports no relevant financial disclosures. Please see the full study for a list of all other authors’ relevant financial disclosures.
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