Background/Aims: To characterize the impact of cranial asymmetry and age at initiation of therapy on final cranial asymmetry in infants with deformational plagiocephaly treated with helmet orthotics. Methods: We conducted a single-center retrospective review of 45 pediatric patients <12 months of age with deformational plagiocephaly who underwent STARband cranial orthotic helmet treatment. Cranial asymmetry was measured using a 3-dimensional laser surface scanner and defined as a cranial vault asymmetry index (CVAI) >3.5%. Results: Twenty-one patients (47%) were <6 months of age at the start of helmet therapy. A greater initial CVAI or age at therapy initiation correlated with a greater final CVAI (univariate analysis, r = 0.53, p < 0.001; r = 0.42, p = 0.004). Subgroup analysis of 18 patients beginning therapy at 4-5 months of age and 20 patients beginning therapy at 6-8 months of age revealed that only a change in the initial CVAI was associated with a change in the final CVAI (r = 0.43, p = 0.007). Conclusion: In a comparison of patients who initiated helmet therapy at 4-5 and 6-8 months of age, only cranial asymmetry at the outset of therapy was correlated with final cranial asymmetry (r = 0.43, p = 0.007).
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