We report a case of a patient who had aseptic loosening of a total hip prosthesis model PM. At revision we found severe metallosis. A black surgery, seven years after the device was implanted pigment that penetrated the capsule and sorrounded the femoral and acetabular components was found. Histological examination of a the specimen of capsular tissue showed histiocytes loaded with small size metallic particles. Of particular interest was the absence of severe clinical and radiological changes. These finds are unusually associated with aseptic loosening níade by polymeric wear debris. The reason of metallosis was supposed tobe the friction between the neck of femoral component and lower rim of the acetabular component.

We report a case of a patient who had aseptic loosening of a total hip prosthesis model PM. At revision we found severe metallosis. A black surgery, seven years after the device was implanted pigment that penetrated the capsule and sorrounded the femoral and acetabular components was found. Histological examination of a the specimen of capsular tissue showed histiocytes loaded with small size metallic particles. Of particular interest was the absence of severe clinical and radiological changes. These finds are unusually associated with aseptic loosening níade by polymeric wear debris. The reason of metallosis was supposed tobe the friction between the neck of femoral component and lower rim of the acetabular component.