Acetabular Component Positioning in Total Hip Arthroplasty With and Without a Computer-Assisted System: A Prospective, Randomized and Controlled Study

Abstract

In a study of the acetabular component in total hip arthroplasty, 20 hips were operated on using imageless navigation and 20 hips were operated on using the conventional method. The correct position of the acetabular component was evaluated with computed tomography, measuring the operative anteversion and the operative inclination and determining the cases inside Lewinnek's safe zone. The results were similar in all the analyses: a mean anteversion of 17.4 degrees in the navigated group and 14.5 degrees in the control group (P = .215); a mean inclination of 41.7 degrees and 42.2 degrees (P = .633); a mean deviation from the desired anteversion (15 degrees) of 5.5 degrees and 6.6 degrees (P = .429); a mean deviation from the desired inclination of 3 degrees and 3.2 degrees = .783); and location inside the safe zone of 90% and 80% (P = .661). The acetabular component position's tomography analyses were similar whether using the imageless navigation or performing it conventionally.