Hip joint device, system and method

An implantable medical device for implantation in a hip joint of a human patient, the hip joint comprising a caput femur shaped like a ball, being connected to a collum femur and being the upper extremity of a femoral bone, the collum femur and caput femur having a longitudinal axial distribution with a longitudinal caput femur centre axis reaching from the collum femur, in the centre of the collum femur and caput femur and towards an acetabulum, the acetabulum is a bowl shaped section of the pelvic bone, with an opening towards the caput femur, the acetabulum having an acetabulum centre axis reaching from the centre of the bottom of the bowl towards the centre of the opening and the normal position of the caput femur, wherein the caput femur centre axis is aligned with the acetabulum centre axis in a special centered position, when the caput femur is aligned, centered and symmetrical in the acetabulum, the caput femur and acetabulum each having a hip joint carrying surface, facing each other and contacting each other, the hip joint carrying surfaces, carrying weight in the hip joint, wherein said medical device comprises:

• an artificial caput femur or an artificial caput femur surface comprising a positioning through-hole having at least one opening, said positioning through-hole being adapted to receive a positioning shaft, wherein the positioning through-hole is adapted to at least partly surround the shaft, for positioning said artificial caput femur or artificial caput femur surface in a desired position in the hip joint,
• an artificial acetabulum or an artificial acetabulum surface comprising a positioning through-hole having at least one opening, said positioning through-hole being adapted to receive a positioning shaft, wherein the positioning through-hole is adapted to at least partly surround the shaft, for positioning said at least one artificial hip joint surface in a desired position in the hip joint, and
• a stiff positioning shaft adapted to be placed in a bore in at least one of the femoral bone and the pelvic bone, and adapted to penetrate the positioning through-holes of the artificial caput femur or the artificial caput femur surface or the artificial acetabulum or the artificial acetabulum surface, for positioning said artificial caput femur or artificial caput femur surface in relation to said artificial acetabulum or artificial acetabulum surface and in relation to the femoral bone and/or the pelvic bone.