
Arthrogryposis (Arthrogryposis Multiplex Congenita) is a medical term describing the presence of a muscle disorder that causes multiple joint contractures at birth. It can cause lack of muscle build as well as stiff joints.
In some cases, few joints may be affected and the range of motion may be nearly normal. In the “classic” case of arthrogryposis, hands, wrists, elbows, shoulders, hips, feet and knees are affected. In the most severe cases, nearly every body joint may be involved, including the jaw and back. Arthrogryposis is relatively rare, occurring in approximately one in 3,000 births.

