How come some people are double jointed and others are not?

gdec1

Joint hypermobility means some or all of your joints have an unusually large range of movement; you may be particularly supple at one or more joints. Joint hypermobility occurs because connective tissue in the joints, muscles, tendons, and ligaments are more loose and stretchy than in most people. This means the joints are more flexible and can extend further. It is often first noticed when as a child you could bend into strange positions or were called ‘double jointed’. Joint hypermobility can vary greatly between different people. If your hypermobility is mild it will not affect you too much and will not need treatment. If it is more severe you may be in some pain, your joints may often dislocate and you could injure yourself. http://www.nhsdirect.nhs.uk/articles/article.aspx?articleId=563 Jul 31 06, 8:40 AM