Hypermobility tests
The Beighton Scale is a simple way of testing if your joints are hypermobile. It is broken down into 5 different movements and measures out of a total of 9 points. You are generally considered to be hypermobile if you have a score of 5/9 or more.
Is it bad to be double-jointed?
Hyperextending a limb may feel normal to you — and most of the time, if you're so-called “double-jointed,” it's not harmful to your body.
How do you know if you're double-jointed?
Joint hypermobility tends to decrease with aging as we become naturally less flexible. Signs of the syndrome are the ability to place the palms of the hands on the floor with the knees fully extended, hyperextension of the knee or elbow beyond 10 degrees, and the ability to touch the thumb to the forearm.