The true "cost" of ignoring plagiocephaly is not financial or purely cosmetic. Leaving a moderate or severe asymmetry untreated during the critical window of bone plasticity in infants carries real risks. There are numerous indexed international scientific studies demonstrating a direct correlation between uncorrected bone deformities and potential problems in neurological, motor, visual, and auditory development.
1. Alterations in Neurodevelopment and Neurological Functions
Association of positional plagiocephaly and developmental delay within a primary care network
A retrospective study based on electronic medical records of 77,108 children in primary care showed that infants diagnosed with plagiocephaly before 12 months have 1.5 times higher probability (adjusted OR: 1.50; 95% CI: 1.32–1.70) of presenting developmental delays compared to those without this condition.
Additionally, the diagnosis of plagiocephaly preceded that of delay in 92.6% of cases where both conditions coexisted, suggesting that it could act as an early indicator of functional neurological risk.
Cognitive outcomes and positional plagiocephaly
A comparative study in school-age children showed that children with moderate to severe positional plagiocephaly and/or brachycephaly (PPB) during infancy scored lower on cognitive and academic tests compared to controls. Differences were significant only in moderate to severe cases, while in mild cases the associations were negligible. The authors suggest that PPB could act as a developmental risk marker, without necessarily implying a causal relationship.
Neurodevelopment in children with single-suture craniosynostosis and plagiocephaly without synostosis
Study that evaluated cognitive and psychomotor delays in children with single-suture craniosynostosis or plagiocephaly without synostosis using the Bayley-II Scales. 63 children were analyzed before intervention, finding significant delays in psychomotor development (PDI), especially in craniosynostosis. Post-treatment follow-up is recommended to assess improvements.
Long-term developmental outcomes in patients with deformational plagiocephaly
Pioneering follow-up research revealed that a very significant percentage of school-age children with a history of deformational plagiocephaly later required special education services, occupational therapy, or physiotherapy. The findings suggest that it serves as an early marker of functional delays.
Neurodevelopmental delays in children with deformational plagiocephaly
Prospective clinical study of 110 infants that demonstrated that, before any intervention, patients with deformational plagiocephaly show significant delays in both mental and psychomotor development (assessed with the Bayley scales) compared to the standardized population.
Neurological findings in babies with deformational plagiocephaly
Neurological evaluation of 49 infants with plagiocephaly compared with 50 healthy controls. A statistically significant difference was found in overall scores, with a predominance of alterations in muscle tone (abnormally variable tone, both high and low), confirming a functional neurological vulnerability.
Case-control study of neurodevelopment in deformational plagiocephaly
Research comparing babies with plagiocephaly to healthy children, concluding that affected patients scored significantly lower on all Bayley scales (especially in the motor aspect). It strongly suggests that plagiocephaly is a marker of high risk for neurodevelopmental delay.
A prospective study on cranial deformity and delayed development in children
Prospective study of 48 infants with plagiocephaly that evaluated the effect of physiotherapy, cranial orthoses, and family postural exercises on psychomotor development. The results indicate that plagiocephaly is a risk marker for delay (especially in motor and language areas), and that this delay can improve with treatment.
Plagiocephaly and developmental delay: a systematic review
A systematic review of 19 articles found a consistent positive association between plagiocephaly and developmental delay (primarily motor). Early referral to physiotherapy and early intervention are recommended to mitigate long-term risks.
2. Speech, Communication, and Language Problems
Deficient language acquisition in children with single-suture craniosynostosis and deformational posterior plagiocephaly
Study on language acquisition in children with single-suture craniosynostosis and deformational posterior plagiocephaly, which showed an increased risk of speech and language disorders (21% with severe alterations, 3 times more than the general population). Children with sagittal synostosis showed better linguistic development, while those with posterior plagiocephaly (operated or not) also showed delays, contradicting the previous belief that the risk was limited to craniosynostosis.
3. Congenital Muscular Torticollis and Biomechanical Restriction
Craniofacial deformity in patients with uncorrected congenital muscular torticollis: evaluation using 3D computed tomography
Study using 3D computed tomography in 14 patients with uncorrected congenital muscular torticollis (1 month–24 years): cranial and skull base deformity appears from infancy (especially in the posterior cranial fossa), while facial asymmetry (mandible, maxilla, orbit) develops from the age of 5, worsening with age. Early muscle release is recommended to prevent craniofacial deformities.
4. Auditory Problems and Central Sound Processing
Event-related auditory potentials (ERP) reveal brain dysfunction in infants with plagiocephaly
Electrophysiological study demonstrating that infants with plagiocephaly show reduced amplitudes in auditory ERPs (P150/N250), confirming for the first time an early neuroauditory involvement and an increased risk of suffering from sound processing disorders.
5. Vision Problems, Astigmatism, and Orbital Asymmetry
Visual field defects in deformational posterior plagiocephaly
Study of 40 infants with posterior plagiocephaly: 35% had constriction of visual hemifields (≥20°) and 17.5% had asymmetry ≥20°. There was no correlation between the laterality of visual defects and cranial laterality, but plagiocephaly can affect the development of the visual field.
Orbital asymmetry and prevalence of strabismus in children with positional cranial deformities
Observational study: in deformational plagiocephaly, there is no higher prevalence of strabismus (only <1% with esodeviation), but there is a higher prevalence of astigmatism (9% unilateral, 15% bilateral). In plagiocephaly due to craniosynostosis, there is a higher prevalence of strabismus (7% exodeviation) and astigmatism (7% unilateral, 21% bilateral)..