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Protrusio acetabuli is defined by the femoral head crossing or touching the ilioischial line (left). Compared with a normal hip, the size of the lunate surface is increased, which leads to a pincer type of FAI. The rationale of our treatment was to reduce the size of the lunate surface by circumferential rim trimming, if possible with labral refixation or reconstruction (right). Figure created by Klaus Oberli. Reprinted with permission.
