FACTS:

• The word, 'Arthrogryposis,' means, 'curved joint,' which implies the joint is fixed in a curved position. Arthrogryposis Mulitplex Congenita (AMC) means, 'curved joints,' in a number of areas of a person's body at the time of their birth. 
• Anything that prevents the common movements of a baby while they are in the womb may lead to contracture, where their joints do not have the opportunity to move with full range.
• Extra connective tissue fixes a person's joint in place, limiting the joint's movement, leading to tendons around the affected joint and an an inability to stretch to their common length; something that makes joint movement after the child is born even harder. When limitation of movement happens over a period of several months there tends to be a lack of growth in the child's limb as well, something that can make the severity of the contracture they experience more intense.
• Read more: http://www.disabled-world.com/health/orthopedics/arthrogryposis.php#ixzz1XHvEQffE