A bone fixation system includes a bone fixation device (101), including a first element (102) having a first channel (110) extending therethrough and a second element (104) including a proximal portion (140) sized and shaped to be received within the first channel such that the longitudinal axes (Ll,L2)of the first and second elements are substantially coaxial and a distal portion (142) including a bone engaging structure (144), a proximal end (112) of the second element slidably locked within the first channel such that the first and second elements are longitudinally movable relative to one another between a permitted range of motion. The system also includes a driving tool (160), including an outer sleeve (162) and an inner sleeve (166) slidably received therethrough, a distal end (164) of the outer sleeve configured to engage the proximal end (106) of the first element to prevent relative rotation therebetween, a distal end (168) of the inner sleeve configured to engage the proximal end of the second element.
