A short-stem femoral implant suitable for use in hip arthroplasty configured to self-stabilise against sliding across the endo-cortex when implanted in a subject's femur. The femoral implant includes a distal end configured to engage in abutment with the lateral endo-cortex of the subject's femur at two distal locations such that when implanted, the femoral implant has a reduced tendency for sliding across the endo-cortex.

A surgical instrument for operating hip joint osteoarthritis in a human patient is provided. The hip joint comprises an acetabulum, being a part of the pelvic bone, and a caput femur, being the proximal part of the femoral bone. The surgical instrument is adapted to assist in the operating of the hip joint osteoarthritis from the abdominal side of the pelvic bone of said human patient.

A femoral prosthetic component has a stem and a neck. The neck defines a centre of rotation when engaging a head articulating within an acetabular cup in use. The component has anterior offset so that the centre of rotation is anteriorly offset with respect to a longitudinal axis of the stem. A proximal portion of the neck has posterior angulation. This three-dimensional geometry, including in the longitudinal plane, increases range of motion and mitigates against impingement.

A surgical and a laparoscopic/arthroscopic method for operating hip osteoarthritis using an instrument that is adapted to create a through-going hole placed in the acetabulum area from the abdominal side of the pelvic bone of the human patient. The instrument comprises: a driving member, a bone contacting organ in connection with said driving member, an operating device adapted to operate said driving member. The bone contacting organ is adapted to create a hole in the acetabulum area starting from the abdominal side of the pelvic bone through repetitive or continuous movement.