Hip joint device and method

A medical device for implantation in a hip joint of a human patient, the hip joint having a ball shaped caput femur as a proximal part of a femoral bone with a convex hip joint surface towards a centre of the hip joint and an acetabulum as part of a pelvic bone with a concave hip joint surface towards the centre of the hip joint, the medical device comprising;

• an artificial caput femur, comprising a convex surface towards the centre of the hip joint, wherein said artificial caput femur is adapted to, when implanted:
• a. be fixated to the pelvic bone of the human patient, and
• b. be in movable connection with an artificial acetabulum surface fixated to the femoral bone of the patient, thereby forming a ball and socket joint, wherein
• the medical device further comprises a fixation element comprising a fixation surface adapted to be in contact with a surface of the acetabulum or its surroundings and adapted to fixate the artificial caput femur to at least acetabulum of the pelvic bone, such that there is a gap at least a portion of the artifical caput femur and the acetabulum.