<Tr> <Th> Specialty </Th> <Td> Rheumatology </Td> </Tr> <Tr> <Td_colspan="2"> (edit on Wikidata) </Td> </Tr> <P> Hypermobility, also known as double - jointedness, describes joints that stretch farther than normal . For example, some hypermobile people can bend their thumbs backwards to their wrists, bend their knee joints backwards, put their leg behind the head or perform other contortionist "tricks". It can affect one or more joints throughout the body . </P> <P> Hypermobile joints are common and occur in about 10 to 25% of the population . It is usually not associated with any symptoms but a minority of people develop other conditions caused by their unstable joints; in such cases, it is known as joints hypermobility syndrome (JHS). </P>

Why do my fingers bend so far back