The present invention relates to a device (1) for stabilising joints, comprising a receptacle (20), wherein the receptacle (20) is filled with a filling medium (30), a first body (40) for interaction with the filling medium (30), wherein the first body is arranged displaceably in the receptacle (20), a force-transmission means (50) for the transmission of an external force onto the first body (40), a second body (60) for interaction with the filling medium (30) which is arranged displaceably in the receptacle (20), wherein the second body is coupled elastically to the first body (40) via a coupling element (70), wherein at least one of the second body (60) and the first body (40) have at least one outlet opening (64) through which the filling medium (30) can flow, and wherein the first body (40) forms a valve body and the second body (60) forms a valve seat so that a flow of the filling medium (30) through the outlet opening (64) can be allowed or prevented as a function of the valve position.