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Fig. 2B —Femoral and patellar components of prostheses. 63-year-old woman with cobalt chrome prosthesis. Sagittal proton density-weighted MR image shows extensive periprosthetic metallic susceptibility artifact. Quadriceps tendons and suprapatellar recess (white arrows), bone-prosthesis interface (black arrows) of femoral component, and patellar component (arrowheads) are markedly obscured by metal artifact.