Elastic joint for a suspension arm of a motor vehicle, said joint comprising at least: - an external casing, - an internal bushing which extends axially along an articulation axis and which is adapted to cooperate with an axial articulation rod secured to the suspension arm, the internal bushing being mounted such that it can move axially in the external casing along the articulation axis between a front position, a rear position, and an intermediate rest position, and - an insert ring which is interposed radially between the internal bushing and the external casing, and which is adapted to elastically return the internal bushing to its intermediate rest position, the external casing comprising a first reduction in diameter forming a first front stop and a second reduction in diameter forming an opposite second rear stop, the internal bushing comprising a radial flange which has a first bearing face which is adapted to cooperate with said first front stop and a second bearing face which is adapted to cooperate with said second rear stop so as to limit the travel of the internal bushing, characterized in that the insert ring comprises: - a tubular filtering element which is secured to the internal bushing and which is made of elastically deformable material to allow the elastic return of the internal bushing to its intermediate rest position, and - a cage which surrounds the filtering element and which is interposed axially along the articulation axis between the second bearing face of the flange of the internal bushing and the second rear stop of the external casing. - an external casing, - an internal bushing which extends axially along an articulation axis and which is adapted to cooperate with an axial articulation rod secured to the suspension arm, the internal bushing being mounted such that it can move axially in the external casing along the articulation axis between a front position, a rear position, and an intermediate rest position, and - an insert ring which is interposed radially between the internal bushing and the external casing, and which is adapted to elastically return the internal bushing to its intermediate rest position, the external casing comprising a first reduction in diameter forming a first front stop and a second reduction in diameter forming an opposite second rear stop, the internal bushing comprising a radial flange which has a first bearing face which is adapted to cooperate with said first front stop and a second bearing face which is adapted to cooperate with said second rear stop so as to limit the travel of the internal bushing, characterized in that the insert ring comprises: - a tubular filtering element which is secured to the internal bushing and which is made of elastically deformable material to allow the elastic return of the internal bushing to its intermediate rest position, and - a cage which surrounds the filtering element and which is interposed axially along the articulation axis between the second bearing face of the flange of the internal bushing and the second rear stop of the external casing. - a tubular filtering element which is secured to the internal bushing and which is made of elastically deformable material to allow the elastic return of the internal bushing to its intermediate rest position, and - a cage which surrounds the filtering element and which is interposed axially along the articulation axis between the second bearing face of the flange of the internal bushing and the second rear stop of the external casing.