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Fig. 2. —Longitudinal sonographic image obtained along lateral joint line in 80-year-old woman with total knee arthroplasty shows sonographic appearance of metal–bone–polyethylene interface in total knee arthroplasty. Polyethylene (thick arrow) is being measured by electronic calipers. Note linear echogenic interface superficially and posterior acoustic shadowing generated by polyethylene. In contrast, that with metallic tibial and femoral components (thin arrows) shows posterior reverberation artifacts. A = 0.96 cm.

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