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To assess the match in size and shape between the native ulnar head and a partial ulnar head implant in cadaver specimens.Ten fresh-frozen cadaver arms (6 male, 4 female, age range 79–91 years) with no history of previous distal radioulnar joint surgery were used. Radiographic measurements before and after implantation were used to compare ulnar head articular height, width, offset, and ulnar variance...