Native American myopathy (Orphanet_168572, an Orphanet rare-disease nomenclature id) (NAM) is a neuromuscular disorder characterized by weakness, arthrogryposis, kyphoscoliosis, short stature, cleft palate, ptosis and susceptibility to malignant hyperthermia during anesthesia. Also known as: Congenital myopathy - cleft palate - malignant hyperthermia.