A 41 year-old right-hand dominant man presented with a 1-month history of pain in his right wrist after training for rock climbing. He had climbed for 11 years, and had gained the 8+ level of the International Union of Mountaineering Associations (11+ is the top level). During training, he performed the "bouldering technique" (climbing over large rocks). He used the "open grip" position with the right wrist placed in 20° flexion and moderate ulnar deviation, and the metacarpopha-langeal and proximal and distal interphalangeal joints in slight flexion. When extending his wrist under considerable stress, he had heard a "clunk" and had developed severe dorsal wrist pain.
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