STABILIZING BONE FIXATION ELEMENT

摘要

A bone fixation device includes (a) a threaded shaft extending from a proximal end to a distal end; (b) a head located at the proximal end of the shaft; (c) a connector threadably engaging the threaded shaft and movable therealong; and (d) an extension member movable between an insertion configuration for insertion through an opening in a cortex of a bone to a locked configuration when pressed against an inner surface of the cortex. The profile of the wing in the locked configuration in the plane perpendicular to the longitudinal axis of the shaft is increased relative to the insertion configuration to distribute forces transmitted between the bone fixation apparatus and the bone over an increased area of the cortex.