a congenital disorder, caused by genetic factors in 30% of cases. It is marked by distorted joints in different body areas, for example, clubfoot, and a greater than average incidence of mental retardation. In some cases arms may be rotated inward, the hips may be dislocated, and the muscles may be small, weak, and hypotonic. The term itself means crooked-joint disorder.

ARTHROGRYPOSIS MULTIPLEX CONGENITA: "A person with the congenital disease arthrogryposis multiplex congenital may have one or more distorted joints, for example, a clubfoot. "