Wear Analysis of 29 Metal-on-Metal Hip Resurfacing Retrievals and Relationship with “Adverse Local Tissue

ALTR I Osteolysis and failure but with no soft tissue mass. Osteolysis was either determined radiographically, or at retrieval upon sectioning of the femoral component (for osteolysis inside the femoral head or neck which could not be detected radiographically). ALTR II Local fluid or solid mass with or without osteolysis. Masses were either discovered upon retrieval or identified using MARS-MRI ALTR III Metal Hypersensitivity determined by histological examination of periprosthetic tissues, with clinical symptom of pain, but without radiographic loosening or verified infection. Figure 1: ALTR classification