A medical device for implantation in a hip joint of a patient is provided. The medical device is adapted to be fixated to the femoral bone of the patient. The medical device comprises an inner and an outer surface, wherein a contacting portion of said inner surface is spherical and adapted to face the center of the hip joint when said medical device is implanted, and wherein said medical device is adapted to receive a prosthetic replacement for the caput femur fixated to the pelvic bone having a spherical portion. The medical device comprises at least one extending portion, extending said contacting portion of said inner surface such that said at least one extending portion clasps said spherical portion of said prosthetic replacement for the caput femur, such that said spherical portion is restrained in said medical device.
