A Case of Pseudotumor Detection Using Contrast-Enhanced Tomosynthesis After Metal-on-Metal Total Hip Arthroplasty

IntroductionPseudotumor is a known complication of Metal-on-Metal (MOM) total hip arthroplasty (THA). MRI is usually used to visualize pseudotumor formation. However, small pseudotumors close to the THA components may not be observed using MRI due to image distortion by the interaction between the metallic objects and the magnetic fields. The CT image quality also degrades because MOM THA components can induce X-ray beam-hardening effects. Therefore, we evaluated contrast-enhanced (CE) tomosynthesis. Tomosynthesis is known as an X-ray tomography technique that provides images with fewer metal artifacts and lower X-ray doses for the patients. The aim of this report was to investigate the detectability of pseudotumors by tomosynthesis.Case ReportA 71-year-old woman had undergone unilateral cementless large-diameter MOM THA using a couple of Conserve Plus acetabular cup and Profemur Z femoral component (Wright Medical, Memphis, Tennessee) for primary arthritis of the left hip at our hospital. She presented w...