title: Sternocleidomastoid ultrasonography data for muscular torticollis in infants.
abstract: BACKGROUND
  This study was performed to obtain normative ultrasonographic data of the sternocleidomastoid (SCM) muscle in infants and to describe an ultrasound method for evaluating muscular torticollis.
  
  
  METHODS
  The thickness and cross-sectional area (CSA) of the sternal and clavicular heads of the SCM in 84 subjects were analyzed retrospectively. The diagnostic performance of ultrasonography (US) was estimated using receiver-operating characteristic analysis.
  
  
  RESULTS
  Muscle thickness increased with age until 10 months. There were no significant differences in thickness or CSA between the right and left sides (P > 0.05) in normal subjects. A ratio of the thickness of the affected side to the unaffected side for the sternal head of the SCM muscle of >1.19 showed a diagnostic sensitivity of 97.9% and specificity of 96.4%.
  
  
  CONCLUSIONS
  Distinguishing the heads of the SCM muscle and comparing the thickness of the same head on both sides using US may be helpful for evaluating torticollis in infants.
authors.affiliation: Department of Rehabilitation Medicine, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
authors.forename: Bo Young
authors.initials: BY
authors.lastname: Hong
authors.forename: Young Jin
authors.initials: YJ
authors.lastname: Ko
authors.forename: Joon Sung
authors.initials: JS
authors.lastname: Kim
authors.forename: Eun Jae
authors.initials: EJ
authors.lastname: Ok
authors.forename: Youngdeok
authors.initials: Y
authors.lastname: Hwang
authors.forename: Hye Won
authors.initials: HW
authors.lastname: Kim
mesh_terms: D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D009334:Neck Muscles / Q000000981:diagnostic imaging*; D012886:Skull / Q000000981:diagnostic imaging*; D013249:Sternum / Q000000981:diagnostic imaging*; D014103:Torticollis / Q000000981:diagnostic imaging*; D014463:Ultrasonography