Extract
Various mechanisms of injury to the triquetrum have been described,
including rotational or twisting
injuries1, shearing
by impingement of the hamate on the posteroradial projection of the
triquetrum2,
impaction by the ulnar
styloid3,4,
falls with the wrist in extension and ulnar
deviation2,5,
and direct blows to the dorsum of the
triquetrum1,2,6.In spite of the common nature of triquetral fractures, nonunion is an
exceedingly rare complication. In fact, we identified only one other report of
a triquetral body nonunion in our search of the
literature7. The
uncommon nature of this complication probably is explained by the rich blood
supply to the triquetral body, which has extensive internal vascular networks
and numerous intraosseous
anastomoses8,9.