The most severe of the types of cerebral palsy is spastic quadriplegia, according to the Eunice Kennedy Shriver National Institute of Child Health and Human Development.
Spastic quadriplegia involves severe hypertonia (too much muscle tone) of the arms and legs and a floppy neck. Children with spastic quadriplegia are unable to walk and often have speech difficulties.
Patients with spastic quadriplegia may also experience moderate to severe intellectual and developmental disabilities (IDD).