A joint prosthesis includes first and second articulated corresponding joint components implantable within a body of a patient, wherein the corresponding joint components have corresponding surfaces that are relatively displaceable with respect to each other over a predefined functional range of motion of the corresponding joint components. The corresponding joint components each comprise one or more magnetic elements creating gradient magnetic fields having relatively strongest and weakest field areas over different portions of each of the corresponding surfaces, wherein the gradient magnetic fields are strongest in attraction at positions of the corresponding surfaces which align when the corresponding surfaces are at a boundary of the predefined functional range of motion, and deter joint dislocation by deterring relative movement of the corresponding surfaces beyond the boundary.