Summary. Bilateral congenitally hip luxation and porotic hyperostosis on an early-christian woman's skeleton. Here is studied the skeleton of a young woman, belonging to the Mediterranean type, buried in an early Christian tomb. She suffered from bilateral congenitally displasia of the hip joint and porotic hyperostosis in the skull vault (hyperostosis spongiosa cranii). The hip luxation is obvious but the etiology of porotic hyperostosis is difficult to specify. Many diseases, characterized by swelling bone and porosity, may have caused this porotic hyperostosis, but we shall keep only two of them : either Thalassemia minor (Rietti-Greppi-Micheli desease), or constitutional haemolytic anemia (Minkowski-Chauffard disease).