Arthrodesis Device

The device according to claim 8, wherein said third fastening direction (F3-F3′) is orthogonal to said main plane (P).10. The device according to claim 1, wherein said proximal portion (2) is provided with a fourth fastening orifice (8D), which is configured so as to receive and guide a fourth fastening means (9D) according to a fourth fastening direction (F4-F4′) in order to fasten said nail (1) to said tibia (Ti).11. The device according to claim 10, wherein said fourth fastening direction (F4-F4′) is orthogonal to said main plane (P).12. The device according to claim 10, wherein said proximal portion (2) is provided with a fifth fastening orifice (8E), which is configured so as to receive and guide a fifth fastening means (9E) according to a fifth fastening direction (F5-F5′), which is preferably parallel to said fourth fastening direction (F4-F4′), in order to fasten said nail (1) to said tibia (Ti).13. The device according to claim 12, wherein one amongst said fourth (8D) and fifth (8E) fastening orifices has an oblong shape according to said first direction of extension (A-A′).14. The device according to claim 1, wherein said proximal portion (2) has a cylindrical general shape and is provided with a means for blocking the rotation of the nail (1) about said first direction of extension (A-A′), said blocking means preferably comprising at least one longitudinal groove (6) or fin.15. The device according to claim 1, which further comprises an instrument (10) for setting said nail (1) in place within said joint of the ankle of the patient through a plantar approach, said instrument (10) being preferably designed so as to be removably coupled to a distal end (5) of said nail (1).16. The device according to claim 15, wherein said instrument (10) for setting said nail (1) in place comprises a means (18) for compressing the joint of the ankle of the patient.17. A surgical method for carrying out an arthrodesis of an ankle joint, in which an arthrodesis device according to claim 1 is used, said surgical method comprising at least one step during which said nail (1) is set in place within the joint of the ankle of the patient, wherein during said step of setting the nail (1) in place, said nail (1) is implanted in the joint of the ankle so that said distal portion (4) of the nail (1) is directed rearwards of the ankle of the patient, and a step during which the nail (1) is simultaneously fastened to the talus (L) and to the calcaneus (Ca) via said fastening orifice (8A) and using said first compressive fastening means (9A) received and guided within said first fastening orifice (8A).