That person most likely has Elhers-Danlos Syndrome, a connective tissue disorder that makes joints too flexible. "Double jointed" is a bad way of saying too flexible.
http://mbwalz.hubpages.com/hub/What-is- … s-Syndrome
Being able to bend the joints in a greater degree than is usual. So-called double-jointedness is due to the ligaments which hold bones together at a joint being abnormally loose.
The contortionist can bend himself into extraordinary shapes because by long practice he has stretched his ligaments.
by Tony the writer6 years ago
What makes a person double jointed?
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