Joint mobility was examined on 1.136 schoolchildren of both sexes at the ages of 11 and 14 years. At the same time, they were asked if they had a history of bone fractures and about their weekly consumption of liver. The results were that 13% of the boys and 21% of the girls had hypermobility of their joints. A description is made of a short test to detect hypermobility. It was found that liver consumption and hypermobility are related, also that only in boys hypermobility is contrarily related with the history of fractures.