Pain After Hip Arthroplasty: MR Imaging/Ultrasound Correlation

MR imaging and ultrasound (US) have complementary roles for the comprehensive assessment of painful hip arthroplasty. Both modalities demonstrate synovitis, periarticular fluid collections, tendon tears and impingement, and neurovascular impingement, often with features indicating the causative etiology. MR imaging assessment requires technical modifications to reduce metal artifact, such as multispectral imaging, and optimization of image quality, and a high-performance 1.5-T system. US images periarticular structures at high-spatial resolution without interference of metal artifact, permitting real-time dynamic evaluation, and is useful for procedure guidance. Bone complications (periprosthetic fracture, stress reaction, osteolysis, and component loosening) are well depicted on MR imaging.