The invention relates to an elongate guide element (22) for guiding an implant (1) along a tunnel (17) in a bone (12, 14) and for securing the implant within the tunnel. One exemplary guide element comprises: first end and second ends (24, 26)； a pair of support apertures (42) for receiving a support element (3) for the implant, the support apertures being spaced apart in a direction along a main longitudinal axis (28)； a saddle (46) extending transverse to the longitudinal axis, one of the pair of support apertures being disposed between the saddle and the first end and the other between the saddle and the second end. The support element extends through one of the pair of support apertures, at least partly around the saddle and then through the other aperture. The guide element has a generally planar bone facing surface (48) and a second opposite surface (50). The guide element has a height, measured in a direction from the planar surface towards the second surface, the height increasing in a direction from the first and second ends towards an intermediate section of maximum height (H). At least part of the saddle is disposed within the intermediate section and defines a space (54) between the second surface and a maximum height extent of the saddle, for receiving part of the support element.L'invention concerne un élément de guidage allongé (22) pour guider un implant (1) le long d'un tunnel (17) dans un os (12, 14) et pour fixer l'implant à l'intérieur du tunnel. Un élément de guidage donné à titre d'exemple comprend : première extrémité et une seconde extrémité (24, 26) ； une paire d'ouvertures de support (42) pour recevoir un élément de support (3) pour l'implant, les ouvertures de support étant espacées les unes des autres dans une direction le long d'un axe longitudinal principal (28) ； une selle (46) s'étendant transversalement à l'axe longitudinal, l'une des ouvertures de la paire d'ouvertures de support étant disposée entre la selle et la première extrémit
