Ann Rehabil Med.  2012 Feb;36(1):33-38. 10.5535/arm.2012.36.1.33.

Reliability of Hip Migration Index in Children with Cerebral Palsy: The Classic and Modified Methods

• Kim SM
• Sim EG
• Lim SG
• Park ES

• KMID: 2266778
• DOI: http://doi.org/10.5535/arm.2012.36.1.33

Abstract

OBJECTIVE
To determine reliability and clinical use of two methods of migration index (MI) in CP patients with or without hip dysplasia. METHOD: The materials included radiographs of 200 hips of children with cerebral palsy. Conventional anteroposterior radiographs of the pelvis were taken with the child in the supine position with standardized methods. Two rehabilitation doctors measured the migration index using two methods. In the classic method, the lateral margin of the acetabular roof was used as a landmark and in the modified method the lateral margin of the sourcil was used as a landmark. Each rater measured the migration index at three separate times with a time interval of at least one week. Intraclass correlation (ICC) was used to test the inter- and intra-rater reliability.
RESULTS
MI shows excellent intra-rater reliability in both the classic and modified methods, but the inter-rater reliability was higher in the classic method than in the modified method. When categorized according to the sourcil classification, inter-rater reliability was higher in the normal sourcil type and lower in the dysplastic sourcil types.
CONCLUSION
Generally, the classic method showed higher reliability than the modified method, even though the reliability of the MI measurement was relatively high with both methods.

Keyword

Cerebral palsy; Hip joint; Radiography; Migration index; Reliability

MeSH Terms

Cerebral Palsy
Child
Hip
Hip Joint
Humans
Pelvis
Supine Position

Figure

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  Fig. 1 Sourcil (arrow) in the normal hip (A) and dysplastic hip (B).

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  Fig. 2 Migration Index (MI) is measured with the classic method (A) and the modified method (B). H: Hilgenreiner's line, P: Perkin's line, MI=a/b×100 (%).

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