What is the meaning of cerebral palsy spastic diplegia?

Stiff legs from CP: Cerebral palsy describes disorders of movement & posture related to injury to the developing nervous system before the third birthday.(pregnancy, labor, delivery or after) an injury to the brain cells that handle the motor functions of the lower extremities can produce diplegia (two limb) stiffness.This injury has been associated with a brain hemorrhage near the motor cells.

Stiff legs: Cerebral palsy is a static encephalopathy that affects the control of muscles. If the control problem only affects the legs, it is referred to as diplegia. Different forms include spastic with stiffness, ataxic with poor balance, dyskinetic with random rigid and loose tone, or choreoathethotic with strange random movments. Spastic diplegia is one of the more common and more mild forms.