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©2013 UpToDate ® Print Email Displaced (two-part) proximal humerus fracture This anteroposterior radiograph shows a signficantly displaced fracture of the humerus at the surgical neck. In the Neer classification system this is categorized as a two-part fracture. The superior displacement of the distal fragment was clinically apparent as shortening of the upper arm. Courtesy of Rebecca Bassett, MD.