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.
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