Double jointedness is a complete medical myth, as nobody actually has extra joints hiding in their skeletal structure; they just have extremely loose ligaments.

A closer look

Double jointedness is a complete medical myth, as nobody actually has extra joints hiding in their skeletal structure; they just have extremely loose ligaments. Hypermobility allows people to bend their thumbs backward to their wrists or contort their limbs into horrifying angles that look like cheap practical effects in a horror movie. While it makes for a fantastic party trick when you are twelve years old, these stretchy connective tissues often lead to a lifetime of terrible joint pain, arthritis, and accidental dislocations. Your collagen is basically made of cheap, overstretched rubber bands that fail to hold your bones together tightly, meaning your body is constantly on the verge of falling apart. The people you were jealous of in gymnastics class are now spending a fortune on physical therapy just to keep their shoulders from popping out when they sneeze