PMC6481123_01
Clinical examination. (a) Bony spur on the anterior-posterior plain radiograph of the wrist joint (white arrowhead). (b) Bony spur on the lateral plain radiograph of the wrist joint (white arrowhead). (c) Bony spur on computed tomography (white arrowhead).
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The anterior-posterior and lateral plain radiographs showed a bony spur arising from the volar ulnar aspect of the distal radius (Figures 1(a) and 1(b)). Computed tomography revealed that the bony spur from the radius was a part of DRUJ OA (Figure 1(c)).
Intraoperative findings. (a) Rupture of the flexor digitorum profundus of the index finger (black arrowhead). Degeneration of the flexor digitorum superficialis of the index finger (white arrowhead). (b) A pinhole-sized perforation of the distal radioulnar joint capsule (white arrowhead). The bony spur covered with a joint capsule (black arrowhead).
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The FDP of the middle finger had undergone slight degeneration; however, tension of the FDP of the middle finger was normal (Figure 2(a)). The bony spur toward the volar side was covered with a joint capsule (Figure 2(b)). The volar capsule of the DRUJ had a pinhole-sized perforation (Figure 2(b)). There was synovial fluid from the pinhole-sized perforation (Figure 2(b)).