Department of Trauma and Orthopaedics, Royal United Hospital, Combe Park, Bath, BA1 3NG, UK Correspondence to: Mr. H. Nagata, 1 Belgrave Place, Bath, BA1 5JL, UK.

The nickname replaces its more technical moniker, distal hyperextinsibility, which is a fancy way of saying super flexible ligaments. It may be a cool party trick, but could it also be a health ...