Although avascular necrosis after fracture of the scaphoid is common, it rarely develops without apparent trauma. However avascular necrosis of the triangular bone is extremely rare. It is there fore extremely rare to find the former condition on one side with the latter on the other, and this has not been reported previously in any literature.
This paper presents one case of idiopathic avascular necrosis of the triangular and of the scaphoid.
A 42-year-old female cook complained of motion pain in her right wrist since her restaurant opened. One year later motion pain in her left wrist was added. Radiographs showed ulnar plus variant; 5mm at right and 4mm at left, and showed cysts in the triangular bone and scaphoid. She was treated conservatively, and her complaints decreased. MRI was taken three times over six months, and it was shown that the triangular developed a tendency to heal but the scaphoid tended to become worse. In following conservative treatment MRI examination is useful.
