Hip joint instrument and method

A surgical instrument for operating hip joint osteoarthritis in a human patient, a hip joint comprising an acetabulum, the acetabulum being a part of a pelvic bone, and a caput femur, the caput femur being a proximal part of a femoral bone, wherein said surgical instrument is adapted to assist in the operating of the hip joint osteoarthritis from an abdominal side of the pelvic bone of said human patient, said surgical instrument comprising an abdominal portion insertable through an incision in skin in an abdominal region and adapted to be placed between the incision in the abdominal region and the pelvic bone when the instrument is in use, and a pelvic portion connected to the abdominal portion, being partially insertable through a hole in the pelvic bone from the abdominal side of the pelvic bone, when the instrument is in use, wherein a portion of the pelvic portion is adapted to operate at least partially in a surgically created hole in the pelvic bone.