DEAR DOCTOR K: This may be a silly question, but here goes: Do people who are “double-jointed” have twice as many joints? DEAR READER: I can see how you might think that. If the question is silly it’s ...

Double-jointed? It’s not just a fun party trick. Uber-flexible joints could be a sign of a rare genetic condition that makes you more susceptible to respiratory illnesses and also complicates recovery ...

Joint flexibility is an oft-coveted trait that provides a special advantage to dancers and athletes, but there can be too much of this good thing. A growing body of research suggests a surprising link ...