New Documentation System for Ulnar Longitudinal Deficiency.

Background: This study examines the value of a new alphanumerical documentation system to classify the whole spectrum of deformities in ulnar longitudinal deficiency (ULD). Methods: The patients with ULD, whom were referred during a 35-year period, were identified from the hospital database. A total of 7 patients with photographs and/or conventional radiographs that could be adequately reproduced were enrolled in the study. Results: Six patients could be classified with the previously proposed classifications and the new documentation system. Three of them were diagnosed with ulnar-deficient hands. One had aplasia of the fifth finger ray (phalanges and metacarpal), a second aplasia of the fourth and fifth finger rays with narrowing of the first web, and a third aplasia of the fifth metacarpal. Furthermore, a fourth patient was diagnosed with hypoplasia of the ulna and congenital wrist amputation; a fifth with hypoplasia of the ulna, dislocation of the radial head, and a bowed radius; and a sixth with partial aplasia involving the middle and distal diaphysis of the ulna. Finally, one patient with an absent ulnar styloid process and oligodactyly with thumb could be classified only with the new system. Conclusions: The proposed new alphanumerical documentation system incorporates all the most widely accepted previous classification schemes, facilitates the morphological and radiographic description of the whole spectrum of the deformities detected in patients with ULD for better communication between scientists, and secures the unrestricted inclusion of new variants in the future.