A proposed questionnaire for investigating JHM by history.
|(1)||Can you now (or could you ever) place your hands flat on the floor without bending your knees?|
|(2)||Can you now (or could you ever) bend your thumb to touch your forearm?|
|(3)||As a child did you amuse your friends by contorting your body into strange shapes or could you do the splits?|
|(4)||As a child or teenager did your shoulder or kneecap dislocate on more than one occasion?|
|(5)||Do you consider yourself double jointed?|
|Adapted from .|