Helmet Therapy for Positional Plagiocephaly: A Systematic Review of the Tools Used to Diagnose, Offer Treatment Recommendations, and Assess Treatment Outcomes of the Condition.

Background: Positional plagiocephaly (PP) is an asymmetric deformation of the skull as a consequence of external forces acting on a normal and pliable skull. The prevalence of PP ranges between 19.6% and 46.