An arm stabilizer includes a stabilizer bar and one or more modular attachments that can be detachably secured to the stabilizer bar. A wrist support attachment can be secured to the distal end of the stabilizer bar. A reducer attachment can be secured to the stabilizer bar between the wrist support attachment and the proximal end of the stabilizer bar. The reducer attachment includes a telescoping post with a rest plate that provides a support for applying reduction force to the arm. The reducer attachment can be moved along the length of the stabilizer bar at various angular orientations. A removable wrist pad and a removable brace pad are also provided. In some embodiments stabilizer bar is pivotable about a base to allow the stabilizer bar with attachments to be pivoted away from the patient and repositioned at various points in space during use.