Fig. 2

Photographs and schema of the wrist during and after arthroscopic treatment. (a) Arthroscopic view from the 3–4 portal. The triangular fibrocartilage complex (TFCC) extends over to the radial side. (b) Arthroscopic view from the proximal distal radioulnar joint (DRUJ) portal. A fragment of the ulnar styloid is trapped between the sigmoid notch and ulnar head. The TFCC extends to the fragment. (c) Arthroscopic view from the proximal DRUJ portal. The sigmoid notch faces the ulnar head after the ulnar styloid is reduced. (d) Schema of the arthroscopic procedure from (a) to (c). The arrowhead indicates the view from the 3–4 portal (a), and the arrow indicates the view from the proximal DRUJ portal (b) and (c). (e-g) Schema of the procedures of reduction. (e) The elevatrium from the distal DRUJ portal was brought under the entrapped fragment of the ulnar styloid by guiding it to the radial side of the ulnar head. (f) The fragment of the ulnar styloid was lifted up by the elevatrium. (g) The entrapment of the fragment of the ulnar styloid was reduced. (h) Postoperative site of the dorsal wrist. L, lunate; T, triangular fibrocartilage complex; R, radius; US, ulnar styloid; SN, sigmoid notch; UH, ulnar head