A locking universal-joint hinge having a first and a second orthogonally oriented pivot axes (X, Y), the universal-joint hinge comprising: a first-axis clevis connector having a first arm and a second arm; a second-axis clevis connector having a first arm and a second arm; a cross-shaft member positioned between the two arms of each clevis connectors; a first-axis clevis pin pivotally connecting the two arms (141a, 141b) of the first-axis clevis connector to the cross-shaft member and defining the first pivot axis; a second-axis clevis pin pivotally connecting the two arms of the second-clevis connector to the cross-shaft member and defining the second pivot axis, a first screw for connecting the universal-joint hinge to a base member of an orthopedic external fixator, the first screw being configured to be threaded into a mounting hole in the base member, wherein the first-axis clevis pin extends from the first arm to the second arm of the first-axis clevis connector and through the cross-shaft member, wherein the first-axis clevis pin is configured and adapted to lock the first pivot axis by urging the cross-shaft member against one of the two arms of the first-axis clevis connector causing a surface of the cross-shaft member to contact a surface of the one of the two arms of the first-axis clevis connector and generating a frictional or mechanical interference between the two contacting surfaces, characterised in that the first screw is configured to be threaded into the second-axis clevis connector, the first screw having an internally threaded longitudinal bore; and in that the locking universal-joint hinge further comprises a second screw configured to be threaded into the longitudinal bore, the second screw being configured to be tightened against the cross-shaft member to generate sufficient frictional interference between a distal end of the second screw and the cross-shaft member and to lock the second-axis clevis connector in unison with the cross shaft member. a first-axis clevis connector having a first arm and a second arm; a second-axis clevis connector having a first arm and a second arm; a cross-shaft member positioned between the two arms of each clevis connectors; a first-axis clevis pin pivotally connecting the two arms (141a, 141b) of the first-axis clevis connector to the cross-shaft member and defining the first pivot axis; a second-axis clevis pin pivotally connecting the two arms of the second-clevis connector to the cross-shaft member and defining the second pivot axis, a first screw for connecting the universal-joint hinge to a base member of an orthopedic external fixator, the first screw being configured to be threaded into a mounting hole in the base member, wherein the first-axis clevis pin extends from the first arm to the second arm of the first-axis clevis connector and through the cross-shaft member, wherein the first-axis clevis pin is configured and adapted to lock the first pivot axis by urging the cross-shaft member against one of the two arms of the first-axis clevis connector causing a surface of the cross-shaft member to contact a surface of the one of the two arms of the first-axis clevis connector and generating a frictional or mechanical interference between the two contacting surfaces, characterised in that the first screw is configured to be threaded into the second-axis clevis connector, the first screw having an internally threaded longitudinal bore; and in that the locking universal-joint hinge further comprises a second screw configured to be threaded into the longitudinal bore, the second screw being configured to be tightened against the cross-shaft member to generate sufficient frictional interference between a distal end of the second screw and the cross-shaft member and to lock the second-axis clevis connector in unison with the cross shaft member.