A fastener including at least an element to be anchored in an anatomical support, at least a stop element relative to a planar prosthetic component to be fixed, and a linking rod is characterised in that the linking rod is rectilinear and the junction zones of the anchoring element and the stop element with the linking rod enable the fastener to adopt: a non-stressed stripping configuration; a maximum stress configuration, doubled up on itself, for example in a tubular configuration by complete insertion of the fastener into a tube, and a minimum stress configuration, wherein the respective directions of the stop element and the anchoring element form between them, for example in the same plane, an angle not greater than 90.degree..