Szukana fraza: [Abstract = "The tests performed indicate that the most probable causes leading to the fatigue fracture of the Aura II stem under examination were material defects in the process of casting and forging \(forging the material with delamination and the presence of brittle oxides and carbides\) that resulted in a significant reduction of strength and resistance to corrosion. In the light of an unprecedented stem neck fracture, this information should be an indication for non\-destructive tests of ready\-made stems aiming to discover the material and technological defects that may arise in the process of casting and drop forging."]