Positional plagiocephaly is associated with sternocleidomastoid muscle activation in healthy term infants

Leung, Amy, Mandrusiak, Allison, Watter, Pauline, Gavranich, John and Johnston, Leanne (2017) Positional plagiocephaly is associated with sternocleidomastoid muscle activation in healthy term infants. Child's Nervous System, 1-8. doi:10.1007/s00381-017-3351-z


Author Leung, Amy
Mandrusiak, Allison
Watter, Pauline
Gavranich, John
Johnston, Leanne
Title Positional plagiocephaly is associated with sternocleidomastoid muscle activation in healthy term infants
Journal name Child's Nervous System   Check publisher's open access policy
ISSN 1433-0350
0256-7040
Publication date 2017-02-24
Sub-type Article (original research)
DOI 10.1007/s00381-017-3351-z
Open Access Status Not yet assessed
Start page 1
End page 8
Total pages 8
Place of publication Heidelberg, Germany
Publisher Springer
Collection year 2018
Language eng
Formatted abstract
Purpose: To explore the relationship between sternocleidomastoid activation and positional plagiocephaly in healthy full term infants.

Methods: Participants were 82 infants from a regionally based-longitudinal study of infant development. Sternocleidomastoid (SCM) activation was assessed using active head-righting responses of body-on-head with and against gravity and head-on-body against gravity at 3, 6 and 9 weeks. Plagiocephaly was assessed using the Modified Cranial Vault Asymmetry Index (mCVAI) at 9 weeks.

Results: More severe plagiocephaly was associated with more severe asymmetry in active head-righting responses at all ages (p < 0.001). Greater right-sided occipital flatness was related to stronger contralateral/left SCM activation at 3 and at 9 weeks (p = 0.008). Greater left-sided occipital flatness was related to stronger contralateral/right SCM activation at 3 weeks (p = 0.004). In infants with any right-sided occipital flatness, the mCVAI was greater in infants with asymmetrical gravity assisted body-on-head responses at 3 weeks (mCVAI = 4.31 (2.01)%, 95% CI 2.87–5.75) compared to those with symmetrical responses (mCVAI = 2.64 (1.66)%, 95% CI 2.06–3.22) (p = 0.011).

Conclusions: Sternocleidomastoid activation asymmetry is a significant contributor to plagiocephaly development by 9 weeks of age due to stronger contralateral SCM activation. Active head-righting responses are appropriate to assess sternocleidomastoid activation in infants under 2 months of age.
Keyword Head-righting response
Infant
Modified cranial vault asymmetry index
Positional plagiocephaly
Sternocleidomastoid
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Health and Rehabilitation Sciences Publications
 
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