Abstract: A method for controlling the mutual angle between the parts of an artificial hip joint during an operation for insertion of the artificial hip joint, is described. The stem of the femoral hip prosthesis is fastened permanently or removable in the usual manner in the proximal end of the femur. A tool for controlling of the mutual angle between the stem of the prosthesis and the cup of the prosthesis is fastened to the stem. The femur of the patient is then oriented in a predefined position and the cup is then brought into its intended position by means of the femur of the patient and the mentioned tool. A tool for controlling the mutual angle between the parts of the artificial hip joint is also described.

Abstract: The present invention relates to the area of orthopaedic surgery, and in particular to a system for ensuring that prosthesis components or parts thereof are inserted correctly upon implantation of artificial hip joints and to methods for ensuring correct insertion of the parts of an artificial hip joint or femoral prosthesis during surgery. This system comprises a tool (30) for controlling the mutual positioning of the main components in a hip prosthesis, a measuring device (40), for measuring the distance between two supports connected to the patient's pelvis and leg, and connection members (46, 47) arranged at said measuring device, where said connection members are adapted to interact with receptors at said supports.