Compared to quadriplegia, spastic quadriplegia is defined by spasticity of the limbs as opposed to strict paralysis.It is distinguishable from other forms of cerebral palsy in that those afflicted with the condition display stiff, jerky movements stemming from hypertonia of the muscles.ompared to quadriplegia, spastic quadriplegia is defined by spasticity of the limbs as opposed to strict paralysis.