Irreducible fracture-dislocation of the distal radioulnar joint

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secondary to entrapment of the extensor carpi ulnaris tendon. Hanel-DP; Scheid-DK Department of Orthopedic Surgery, St. Louis University Medical Center, Missouri. Clin-Orthop. 1988 Sep(234): 56-60 Entrapment of the extensor carpi ulnaris (ECU) tendon between the ulnar head and the sigmoid notch of the radius occurred in a 12-year-old boy. This led to an irreducible dorsal dislocation of the distal radioulnar joint (DRUJ). Irreducible DRUJ dislocations are uncommon, and the entrapped ECU has not been previously described in a skeletally immature patient. The physical and roentgenographic findings of a dorsally displaced ulna, a widened DRUJ, and the inability to obtain a closed reduction should alert the examiner to the need for exploration. A dorsal exposure is required to free the ECU and reconstruct the triangular fibrocartilage complex.