Abstract
Hip navigation was used as an assessment tool to compare ability to reproduce trial and definitive acetabular placement in total hip arthroplasty, using cemented and uncemented components. We demonstrated a significant difference in reproducibility between components. Of 20 uncemented cups, 4 (20%) deviated from the target inclination by 5° or more compared to none of 21 in the cemented group ( P = .048). Of the 20 uncemented cups, 7 (35%) deviated from the target version by 5° or more compared to none of 21 in the cemented group ( P = .003). This may explain higher rates of revision for dislocation with uncemented components. There was also a significant difference between the groups with regard to deviation from planned leg length ( P < .001).
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