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The Functional Symmetry Observation Scale, Version 2 (FSOS-V2) shows good reliability for single therapists assessing infants with congenital muscular torticollis (CMT). Interrater reliability needs further improvement for consistent multi-therapist use.

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Area of Science:

  • Pediatrics
  • Rehabilitation Medicine
  • Biomechanical Analysis

Background:

  • Congenital muscular torticollis (CMT) is a common pediatric condition affecting head and neck posture.
  • Accurate assessment of postural and movement symmetry is crucial for effective CMT management.
  • The Functional Symmetry Observation Scale, Version 2 (FSOS-V2) is a tool designed to evaluate symmetry in infants with CMT.

Purpose of the Study:

  • To evaluate the intrarater and interrater reliability of the FSOS-V2.
  • To assess the construct validity of the FSOS-V2 in infants diagnosed with CMT.
  • To determine the clinical utility of the FSOS-V2 for therapeutic decision-making.

Main Methods:

  • The FSOS-V2, a video-based assessment, was used by four examiners to score videos of 50 infants with CMT twice.
  • Intrarater reliability was assessed by comparing scores from the same rater across two sessions.
  • Interrater reliability was evaluated by comparing scores across the four raters.
  • Construct validity was examined by correlating FSOS-V2 scores with head tilt angles measured from supine photographs.

Main Results:

  • Fifty infants with CMT, aged 1 to 16 months, were included in the study.
  • Intrarater reliability for the FSOS-V2 was found to be moderate to good.
  • Interrater reliability demonstrated poor to moderate results, indicating variability between different examiners.
  • The study supported the construct validity of the FSOS-V2.

Conclusions:

  • The FSOS-V2 is reliable for repeated use by a single clinician for making clinical decisions in infants with CMT.
  • Further research is recommended to enhance the psychometric properties of the FSOS-V2, particularly concerning interrater reliability.
  • The findings suggest the FSOS-V2 can be a valuable tool in the clinical setting for assessing symmetry in CMT.