A 49 year-old right-handed man fell backward on his outstretched left hand. He supported his entire body on his palm with the left shoulder in 40° of extension, the elbow in maximal extension, the forearm in 90° of supination and the wrist in maximal extension. Immediately after the injury, he felt pain, swelling and limitation of motion in the left wrist. When we examined him 2 hours after the injury, he complained of pain on the dorsoulnar side of the wrist with limitation of movement. Examination of the wrist showed no joint effusion or tenderness of the distal radius, the anatomical snuffbox or the scaphoid tubercle to suggest a fracture. There was some swelling and discrete tenderness on the dorsoulnar side of the wrist, exactly at "the triquetral point" (Letts and Esser, 1993), the first bony prominence on the dorsum of the wrist, immediately distal to the ulnar styloid.
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