The results of this investigation strongly support an in utero cause of plagiocephaly and demonstrate that intrauterine positioning may play a prominent role in determining both the occurrence and severity of deformational plagiocephaly in twins. These findings confirm that the lower in utero infant is at increased risk for the development of plagiocephaly, likely resulting from the more restrictive intrauterine environment encountered during the later part of the pregnancy.
Seventy-six percent of the sample was found to have some degree of SCM dysfunction, whether it be SCM imbalance or CMT. The finding that over three quarters of our population suffers from some form of SCM dysfunction, either SCM imbalance or CMT, suggests that any degree of SCM dysfunction may act as a precursor to positional plagiocephaly and therefore should be recognized and treated at the earliest opportunity.
Objectives
Infants with positional plagiocephaly often exhibit complex multistructuraI asymmetries that affect the face and skull base as well as the cranial vault. Dynamic Orthotic Cranioplasty (DOC) was developed as a nonsurgical alternative for the treatment of positional plagiocephaly. The effectiveness of DOC has been discussed elsewhere. The purpose of this study was to assess the influence of factors such as entrance age, treatment time, and initial severity on the effectiveness of correction.
Methods
The study sample consisted of 258 children with cranial vault asymmetry (CVA) treated prior to 1 year of age. In addition, 246 patients (92%) exhibited concurrent skull base (SBA) and orbitotragial depth (OTDA) asymmetries. All patients had been diagnosed with nonsynostotic plagiocephaly, did not have other contributing medical conditions, were compliant with DOC protocol, and had complete anthropometric measurements at entrance and exit from treatment.
Results
Mean age at start of treatment was 6.5 (±1.9) months (range, 2.8 to 11.0 months), with an average treatment time of 4.1 (±2.2) months. The effects of the treatment variables were analyzed using three-way analysis of variance. As expected, initial severity was significantly associated with the amount of correction (p = .0001). However, treatment time was not significant (p > .05). Most importantly, the analysis revealed that, having accounted for initial severity, entrance age had a statistically significant effect [F[1,254) = 8.36, p = .0042] on the correction of CVA. Similar results were Identified for both the SBA [F[1,254) = 5.53, p = .0195] and the OTDA [F[1,254) = 5.22, p = .0231] asymmetries.
Conclusions
These findings support clinical observations that earlier intervention results in significantly improved treatment of plagiocephaly, independent of the severity of the presenting asymmetries.
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