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 ...

Marco Arkesteijn does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...