The evolution of muscular contractures and skeletal deformities in cerebral palsy, and criteria for prevention or therapeutical decisions are analized. Developmental brain damage produces a disbalance between bone and muscular growth. Orthopaedic palliative treatments try to avoid malposition of the extremities and to compensate mechanical disbalance during the entire skeletal growth. Therapeutical options are based is on the distinction between dynamic situations and rigid ones; and also on the presence or absence of articular fixed deformities.