A system for fastening an orthopaedic implant either to a bone or to an orthopaedic implant, including a screw and a driver； the screwing having a first end and an apical end, a head at the first end and a thread at the apical end, a bore running axially from the first end of the screw along a portion of the screw towards the apical end of the screw, a first zone at the first end of the bore and a second zone at the apical end of the bore, where the first and second zones have clipping and peripheral engagement means, respectively, where the driver includes a head having first and second segments, the first segment having means for triggering the clipping means during an axial insertion of the driver head into the bore, where the second segment has means for engaging the peripheral engagement means, and where the second segment of the driver head has a rounded axial section, and the second zone of the bore has a rounded socket shape adapted to engage with the second segment of the driver head in various angled positions of the driver versus the axial direction of the screw.
