Hip joint device

A medical device for implantation in a hip joint of a patient, wherein said medical device is adapted to be fixated to the pelvic bone of the patient, and wherein said medical device comprises an inner and an outer surface, wherein a contacting portion, of said inner surface is spherical and adapted to face a geometric center of the hip joint when said medical device is implanted, and wherein said medical device is adapted to receive a caput femur or a prosthetic replacement therefor having a spherical portion, wherein said medical device comprises at least one elastic extending portion, extending said contacting portion of said inner surface such that said at least one elastic extending portion clasps said spherical portion of said caput femur, or the prosthetic replacement therefor, such that said medical device is adapted to restrain the spherical portion in said medical device, wherein said at least one elastic extending portion is adapted to flex to allow expansion of an opening of the medical device for allowing insertion of said spherical portion through said opening of the medical device, and wherein said at least one elastic extending portion is adapted to extend in a proximal quadrant and wherein said medical device comprises a second portion, not extending beyond a circular equator line, and wherein said second portion extends at least along an entire distal, dorsal and frontal quadrants, such that abduction is more restricted than flexion when the medical device is implanted in its final position, and wherein said at least one elastic extending portion and the second portion together constitute an entire bottom portion of the medical device.