The invention relates to Implant device (1) comprising a rigid element (10) being designed to be fastened to a femur implant (20) in a fastened state of said rigid element (10), wherein particularly said femur implant (20) is an intramedullary nail or a femoral stem. According to the invention said rigid element (10) is designed as a hook-shaped plate (10) for encompassing the greater trochanter (3) of the femur (2) at least in sections when being arranged in said fastened state and when said femur implant (20) is arranged in or on the femur (2) as intended.
