Arthrogryposis (also called arthrogryposis multiplex congenital or AMC) is a congenital non-progressive neuromuscular disorder characterized by stiffness and limited range of motion in two or more joints. Joint contractures which cause the limited range of motion develop before birth (prenatally) and are evident at birth (congenitally).
Any and all joints can be affected, but it is possible for some joints to be unaffected. No two people are affected the same way. Treatment often includes stretching, range of motion exercises, splinting, serial casting, physical therapy, occupational therapy and bracing.
Arthrogryposis has been estimated to occur once in every 3,000 live births. It is not thought to be a genetic or hereditary condition. Currently, the exact cause is unknown.