A plate for treating a bone, comprising: a plate body extending along a longitudinal axis from a first end to a second end and being sized, shaped and contoured to be positioned along a desired surface of a bone; and a slotted opening extending through the plate body from a first surface which, when the plate is positioned along the desired surface of the bone faces away from the bone, to a second surface which, when the plate is positioned along the desired surface faces toward the bone, wherein the slotted opening is defined by a first portion sized and shaped to permit a head portion of a bone fixation element fixed to the bone to be passed therethrough and a second elongated portion extending along the longitudinal axis from the first portion in communication with the first portion , the second portion sized to prevent the head portion of the bone fixation element from being passed therethrough so that, when the head portion of the bone fixation element is received through the first portion , the plate is slidable relative thereto such that the second portion engages the head portion of the bone fixation element , the plate further comprising a second hole extending through the plate body from the first surface to the second surface and being open to an exterior of the plate body via a lateral opening , characterized in that the second elongated portion extends from the first portion toward the second end of the plate body and the lateral opening is at the first end of the plate body or the second elongated portion extends from the first portion toward the first end of the plate body and the lateral opening is at the second end of the plate body. a plate body extending along a longitudinal axis from a first end to a second end and being sized, shaped and contoured to be positioned along a desired surface of a bone; and a slotted opening extending through the plate body from a first surface which, when the plate is positioned along the desired surface of the bone faces away from the bone, to a second surface which, when the plate is positioned along the desired surface faces toward the bone, wherein the slotted opening is defined by a first portion sized and shaped to permit a head portion of a bone fixation element fixed to the bone to be passed therethrough and a second elongated portion extending along the longitudinal axis from the first portion in communication with the first portion , the second portion sized to prevent the head portion of the bone fixation element from being passed therethrough so that, when the head portion of the bone fixation element is received through the first portion , the plate is slidable relative thereto such that the second portion engages the head portion of the bone fixation element , the plate further comprising a second hole extending through the plate body from the first surface to the second surface and being open to an exterior of the plate body via a lateral opening , characterized in that the second elongated portion extends from the first portion toward the second end of the plate body and the lateral opening is at the first end of the plate body or the second elongated portion extends from the first portion toward the first end of the plate body and the lateral opening is at the second end of the plate body. <EOS>