case_images: PMC6378482_01
case_images: AP pelvic pre-operative radiograph. Polyethylene wear and asymmetrical positioning of the femoral head are visible in the left hip.
case_images: 10.1177_2050313X19827743-fig1.jpg
case_images: PMC6378482_01_10.1177_2050313X19827743-fig1.jpg
case_images: fig1-2050313X19827743
case_images: Radiographs were obtained and revealed severe polyethylene wear and asymmetry in the left hip (Figure 1).
case_images: Anteversion was measured intraoperatively using navigation and found to be more retroverted than indicated on pre-operative radiographs (5  vs 18 ), leading to revision of the cup component.
case_images: 10.1177_2050313X19827743-fig2.jpg
case_images: PMC6378482_01_10.1177_2050313X19827743-fig2.jpg
case_images: fig2-2050313X19827743
case_images: Furthermore, intraoperative measurement with the navigation system indicated anteversion of 5  (radiographic definition), revealing a cup component significantly more retroverted than the 18  indicated by the pre-operative radiograph (Figure 2).
case_images: Post-operative radiograph shows the revised left hip with new acetabular cup component and liner with improved joint articulation.
case_images: 10.1177_2050313X19827743-fig3.jpg
case_images: PMC6378482_01_10.1177_2050313X19827743-fig3.jpg
case_images: fig3-2050313X19827743
case_images: A decision was made to exchange both the liner and the cup component (Figure 3).