Orthopaedic fixation system, targeting device for such a fixation system and orthopaedic fixation method

An orthopaedic fixation system comprising an anchoring element which is anchorable to a bone and at least one stabilisation element for connecting the anchoring element to a further anchoring element, wherein the anchoring element comprises a stabilisation element seating, into which the at least one stabilisation element is insertable, and also with an extension device for the anchoring element having a longitudinal extent as well as a proximal section and a distal section, which distal section is detachably fixable to the anchoring element, wherein the fixation system comprises a holding device with a probe seating for an extracorporeal ultrasound probe, a coupling device for coupling the holding device to the proximal section of the extension device, an ultrasound probe which is positionable in the probe seating, and a tool for guiding the at least one stabilization element,

• the holding device and the extension device configured to be movable relative to one another, the holding device further configured to be displaceable in an axial direction relative to the extension device along an axis defined by the extension device,
• the coupling device comprising at least one first coupling member on the extension device, and at least one second coupling member on the holding device,
• the at least one first coupling member configured as a seating that comprises an axially extending longitudinal groove, and
• the at least one second coupling member configured as a projection that cooperates with the axially extending longitudinal groove of the at least one first coupling member, the projection adapted to be displaced in the axial direction to allow axial displacement of the holding device with respect to the extension device.