A comparison between imageless navigated and manual freehand technique acetabular cup placement in total hip...

The purpose of this study was to compare acetabular component positioning using an imageless system to a matched control group using conventional techniques. Thirty procedures were performed using navigation. A multislice computed tomographic scan was used to assess cup position. There was no significant difference between mean inclination (P = .11) and anteversion (P = .24) but a statistical significant difference for mean deviation from the desired position for inclination (P = .003) and anteversion (P = .007). There was a significant difference in the percentages of correctly placed cups with inclination (P = .046) and with anteversion (P = .006). Combining both anteversion and inclination, there was a significant difference (P = .01). We demonstrated a significant increase in accuracy of placement of acetabular cups within the desired position and safe zone using imageless navigation.