Ulnar Wrist Deviation in Children With Obstetric Brachial Plexus Palsy: A Descriptive Study of Clinical and Radiological Findings of Impaired Ulnar Growth and Associated Incongruence of the Distal Radioulnar Joint.

Radiologically visible ulnar head hypoplasia, overgrowth of the distal ulna, or a shortened ulnar diaphysis and an incongruent DRUJ were present in all examined OBPP patients with a clinically evident ulnarly deviated wrists. The radiological findings highlight the morphologic adaptation behind this clinical condition and could allow further investigation into suitable treatment strategies.