An apparatus for locating a curvilinear cut in a bone comprises a jig body (102) and a first arm (104), a top end of which is rotatably coupleable to a first portion of the jig body in combination with a second arm (104), a top end of which is rotatably coupleable to a second portion of the jig body separated from the first portion and a saw guide (106) rotatably coupleable to the first arm, the saw guide including a bottom surface extending along a curve corresponding to a desired path through which a bone is to be cut, the saw guide including a locking feature (such as slots 208, 208', 208'') receiving a bone fixation element (such as a bone pin 20) which, in an operative configuration, is mounted in the bone to align the saw guide relative to the arm so that an operator may precisely align a desired axis of the saw guide with a longitudinal axis of the first arm. The jig body includes an orientation feature formed flush to a surface (114) which is perpendicular to the plane in which the arms extend. The orientation feature is an opening or openings (112) in this surface that can be used for alignment of the apparatus to the bone.
