Previously it was thought that the abnormal joint flexibility, a rare and unique phenomenon. Doctors fundamentally disagree with this opinion. Many people can bend the joints in both directions, and there is nothing abnormal.
There are congenital and acquired joint flexibility. Purchased flexibility is formed in the gymnastics and sports associated with stretching of muscles and ligaments.
There is a phenomenon of innate flexibility. Often, it is associated with connective tissue dysplasia. This deviation allows you to bend the arms, the legs, the spine in several directions.
Joints with increased flexibility lose their stability. To maintain a static position requires more muscle strength, and the load on the body increases significantly, notes the medical profession.