Device for the treatment of the dysfunction of a facet joint, the device comprising: a body with a first face and a second face adapted to come into contact with the bone or cartilaginous articular surfaces of the facets (24, 26) of adjacent vertebrae, the device presenting at least one retention interface (78) capable of accepting an elongated retainer therethrough； an elongated retainer (72) adapted to generally maintain the location of the body relative to the facet joint (28), the elongated retainer (72) extending through at least one retention interface (78), and presenting: a first part adapted to extend through a first facet (24 or 26) of the facet joint (28)； and a second part adapted to extend through a second facet (24 or 26) of the facet joint (28), characterized in that the first part is provided with a first part enlarged towards its end that has an enlarged cross-sectional area adapted to fit the first facet (24 or 26) of the facet joint (28) and the second part is provided with a second widened part towards its end which has an enlarged cross-sectional area adapted to fit the second facet (24 or 26) of the facet joint (28), in which the elongated retainer is flexible enough to allow the facets (24, 26) to remain capable of making movements with respect to each other.Dispositivo para el tratamiento de la disfunción de una articulación facetaria, comprendiendo el dispositivo: un cuerpo con una primera cara y una segunda cara adaptadas para entrar en contacto con las superficies articulares óseas o cartilaginosas de las facetas (24, 26) de vértebras adyacentes, presentando el dispositivo por lo menos una interfaz de retención (78) apta para aceptar un retenedor alargado a través de la misma； un retenedor alargado (72) adaptado para mantener en general la ubicación del cuerpo respecto a la articulación facetaria (28), extendiéndose el retenedor alargado (72) a través de por lo menos una interfaz de retención (78), y presentando: una primera parte adaptada
