Method of extramedullary control of the positioning, in orthopedic surgery, of an element with respect to an anatomical landmark of a bone joint. According to the invention, the method consists in projecting, by means of at least one light source (2) fixed to the element to be positioned, at least one light beam (2a, 2b) according to at least one anatomical plane of reference of the anatomical landmark of the joint, to materialize, by means of at least one light line (3), the intersection of said reference anatomical plane with a limb comprising the bone joint, and to allow a visual check of said positioning of the element relative to the anatomical landmark of the joint.
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