Spastic diplegia is a term used to describe one of the most common diagnoses for cerebral palsy. Spastic refers to the movement disorder of spasticity which is a velocity dependent catch in the movement of a limb. Diplegia is a reference to the distribution or topology for CP meaning it involves both legs. Spastic diplegia is often referred to as “bilateral cerebral palsy” though this newer term does not isolate the limbs involved in the movement disorder.