Deformational plagiocephaly in normal infants: a systematic review of causes and hypotheses

BACKGROUND

Deformational plagiocephaly (DP) is one of the most prevalent abnormal findings in infants and a frequent reason for parents to seek paediatric advice.

OBJECTIVE

To systematically review the literature and identify evidence and hypotheses on the aetiology and determinants of DP in otherwise healthy infants.

DESIGN

Systematic keyword search in all major biomedical databases to identify peer-reviewed publications reporting (a) empirical research or (b) hypotheses on the aetiology of DP in healthy, term infants. 3150 studies published between 1985 and 2016 and containing relevant keywords were screened. In a two-pronged approach, results were summarised separately for the body of empirical work (22 studies) and the body of hypotheses (110 articles).

REVIEW FINDINGS

Only a few empirical studies have examined risk factors in non-selected patient populations on a higher grade methodological level. The most commonly reported risk factors were: male gender, supine sleep position, limited neck rotation or preference in head position, first-born child, lower level of activity and lack of tummy time. Agreement between empirical studies was poor for most exposures, including supine sleep position, tummy time and use of car seats. The articles reporting hypotheses on the aetiology of DP cover a wide field of environmental and biological factors, but include little suggestions as to the potential influence of the everyday care environment of the baby.

CONCLUSIONS AND RELEVANCE

The evidence on the aetiology of DP is fragmentary and heterogeneous. In addition, factors possibly relevant to the development of DP have not been appreciated in the scientific discussion.

Prevalence, risk factors, and natural history of positional plagiocephaly: a systematic review

This review synthesized current research evidence on the prevalence, risk factors, and natural history of positional plagiocephaly. Research published between 1985 and 2007 was sourced from 13 databases. Evidence was categorized according to a hierarchy and rated on a standardized critical appraisal tool. These evaluations were incorporated into a narrative synthesis of the main results. Eighteen studies met inclusion criteria (prevalence: n=3, risk factors: n=17, natural history: n=1). The methodological quality of studies was fair. The point prevalence of positional plagiocephaly appears to be age-dependent and may be as high as 22.1% at 7 weeks of age. Point prevalence tends to decrease with age and may be as low as 3.3% at 2 years. When compared with historical data, the prevalence of positional plagiocephaly appears to have remained stable over the last four decades. Assisted delivery, first born child, male sex, cumulative exposure to the supine position, and neck problems may increase the risk of positional plagiocephaly. To reduce the risk of positional placiocephaly, infants should experience a variety of positions, other than supine, while they are awake and supervised, and early treatment may be warranted for infants with neck problems and/or strong head preference.