system for ulnar osteotomy. It is a bone plate (100) which includes: a first three-part combination hole (110) that runs through a proximal region of the plate, a first part (112) of which is configured to engage the threaded head of a bone fixation member (122), a second part (114) of which being configured to receive a bone fixation element (126) along an axis substantially perpendicular to the longitudinal axis of the bone and a third part (116) of which defining a screw axis extending toward the distal end of the elongate body at a non-perpendicular angle to the longitudinal axis; and a first two-part hole (138) running through the proximal region, a first threaded part (140) of which being configured to engage the head of a bone anchor (122) and a second part (142) of which defining an elongated slot extending along the longitudinal axis of the plate to receive a bone fixation element such that the plate slides along its longitudinal axis relative to the bone fixation element.
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