2026 AAHKS Annual Meeting: Dynamic Impingement Modeling in Robotic THA Reduces Dislocation and Instability Revision

29 277 patients undergoing primary total hip arthroplasty (THA) for osteoarthritis through a posterior approach were retrospectively evaluated, including robotic THA with impingement modeling (n=6647), robotic THA without impingement modeling (n=1793), computer-navigated THA (n=5190), and manual THA (n=15647). The primary outcome was survivorship free from dislocation at 3.5 years. The secondary outcome was survivorship free from revision for instability. Patients were followed for a mean of 5.5 years. Overall, the results revealed that robotic THA with preoperative impingement modeling was associated with significantly lower dislocation risk compared with the other surgical approaches. Manual and computer-navigated THA were also associated with higher revision risk for instability. These findings suggested that patient-specific dynamic impingement modeling may improve implant stability and reduce postoperative complications.