Patent ID: 8172841

Claim:
An intramedullary fixation device for use with a bone having a proximal end, including a head, an intramedullary channel, a distal end, and a neck, comprising: a nail having a first portion having a longitudinal axis, at least a portion of the first portion being sized and configured to be located in the intramedullary channel such that the longitudinal axis is aligned within the intramedullary channel when in use, the nail having a lateral side and a generally laterally extending bore; an arm sized and configured to be located in the bore of the nail so that at least a first portion of the arm extends from one side of the bore and a second portion of the arm extends from the other side of the bore, the arm having a threaded portion at one end for fixation into the head of the bone; and a locking mechanism to prevent rotation of the arm relative to the nail, the locking mechanism comprising a groove provided in one of the arm and/or nail, and a nub provided on the other of the arm and nail that can protrude into the groove, the nub configured to slide in the groove thereby allowing the arm to slide relative to the nail, the locking mechanism configured to be located on the lateral side of the nail and the distal portion of the bone when the arm is disposed within the bore.