The present invention relates to an interspinous implant (1) intended to be implanted between two adjacent dorsal spines (El ES) each including an upper edge (E2) a lower edge (E3) and two opposed latéral faces (E4 E5) wherein the implant (1) includes at least one body (10) with dimensions arranged so as to maintain or restore a distance between the adjacent edges (E2 E3) of the two spinous processes (El ES) and including at least two wings (11 12) extending so that at least a part of each wing (11 12) lies along at least a part of one latéral face (E4 E5) of one of the two spinous processes (El ES) and additionally at least one retainer (2 3 4 7 111 121 221 24 28 29 L 90) for the implant designed to retain the body (10) of the implant between the two spinous processes and to be inserted from the same lateral face as the body (10).
