Cerebral palsy: A syndrome caused by non-progressive brain injury and developmental defects from conception to infancy, mainly manifesting as motor deficits and postural abnormalities. Complications of cerebral palsy Mental retardation, epilepsy, perceptual impairment, communication impairment, visual impairment, hearing impairment, dysarthria, behavioral abnormalities, emotional abnormalities, hyperactivity, inattention, and delayed speech. Secondary injury to muscles, bones and joints, such as muscle atrophy, tendon contracture, joint contracture deformation and dislocation, spinal deformity.