types of cerebral palsy
Two children both have cerebral palsy, yet they look nothing alike. One is stiff, his limbs held in tight bent or scissored postures. Another writhes and twists with movements he cannot control. A third is wobbly and unsteady, missing when he reaches. To make sense of this variety, clinicians sort cerebral palsy two ways: by the kind of movement problem, and by which parts of the body are affected.
By movement type there are three main families. Spastic CP, by far the commonest, is dominated by velocity-dependent stiffness from upper-motor-neuron damage — the limbs resist quick movement and tend toward contracture. Dyskinetic CP features involuntary, uncontrolled movements: slow writhing (athetosis), sustained twisting postures (dystonia), or sudden jerks. Ataxic CP, the rarest, is marked by poor balance and clumsy, inaccurate movement from cerebellar involvement. Mixed pictures are common. The second axis is topography — which limbs are involved: hemiplegia (one side of the body, an arm and leg), diplegia (mainly both legs, arms milder), and quadriplegia (all four limbs, often with the trunk and head, usually the most severe).
These labels are not just tidiness; they steer treatment and predict problems. Spastic diplegia points the team toward leg bracing, gait work, and watching the hips; spastic hemiplegia toward one weak hand and a possible role for constraint therapy; dyskinetic CP responds differently to tone medication and rarely to the same surgery; ataxic CP needs balance training more than stiffness control. The honest caveat is that real children seldom fit one box cleanly, and the type, while a useful shorthand, says less about a child's daily ability than a functional measure like the GMFCS does.
A clinic note reads 'spastic diplegic CP': the legs are stiff and scissoring while the arms are nearly normal. Down the hall, 'dyskinetic CP' describes a girl whose hands twist beyond her control. Two very different plans follow — leg bracing and gait work for the first, communication aids and tone medication tailored to the second.
Two axes: movement type (spastic / dyskinetic / ataxic) and topography (hemi / di / quadriplegia).
The movement-type and topography labels are useful shorthand but say little about what a child can actually do day to day — a functional scale like the GMFCS describes that far better. Most spasticity-targeting treatments help spastic CP, not dyskinetic or ataxic forms.