The invention relates to an implant that can be located between adjacent spinous processes of two vertebral bodies of a vertebral column in order to separate adjacent vertebrae from each other, where the implant displays four projections and can be located in a stabilizing position in which two projections can be located on opposite sides of the vertebral column and where, on each side, one of the two projections can be located along the vertebral column, laterally to an upper and a lower vertebra. According to the invention, the implant comprises two at least essentially rigid implant parts, each of which displays two projections that can be located on opposite sides of the vertebral column, where the two parts of the implant are connected to each other in articulated fashion by a joint located in the middle area thereof, such that, referred to the direction of insertion of the implant into the space between vertebral processes, each of the two implant parts displays a front and a rear projection, between which the joint is located.