Corrosion of Modular Dual-Mobility Acetabular Components Leading to Acetabular Bone Loss and Protrusio

Corrosion of Modular Dual-Mobility Acetabular Components Leading to Acetabular Bone Loss and Protrusio

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Dual-mobility bearings are being increasingly utilized in Motorcycle Kit total hip arthroplasty.Contemporary modular designs often feature inner cobalt-chromium liners that are seated in outer titanium acetabular shells.However, mating of these 2 dissimilar metals may lead to complications.We present a case report of a patient who was found to have osteolysis and acetabular protrusio due to an backpacks adverse local tissue reaction from corrosion between a cobalt-chromium liner and titanium acetabular shell that appeared to be well-seated clinically and radiographically.This case suggests that implant failure and associated adverse local tissue reactions may occur even in seemingly well-seated modular dual-mobility implants.