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BMC Musculoskeletal Disorders
Published in: BMC Musculoskeletal Disorders 1/2019

Open Access 01-12-2019 | Hip Dislocation | Research article

The migration percentage measured on EOS® standing full-leg radiographs: equivalent and advantageous in ambulant children with cerebral palsy

Authors: Jef Neirynck, Renee Proost, Anja Van Campenhout

Published in: BMC Musculoskeletal Disorders | Issue 1/2019

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Abstract

Background

During ambulatory follow-up of patients with cerebral palsy (CP) systematic radiographic screening is required firstly to evaluate hip migration and development in the prevention of hip dislocation and secondly to analyse lower limb alignment and leg length. The Migration Percentage (MP) is a radiographic measurement used to describe the extent of femoral head lateralisation on conventional supine pelvic radiographs. Our goal was to assess the comparability of the MP measured on low radiation dose EOS® standing full-leg radiographs with that of conventional supine pelvic radiographs.

Methods

Patients presenting with CP were prospectively selected from our outpatient follow-up consultation at our institutions CP reference centre and underwent conventional supine pelvic and EOS® standing full-leg radiographs the same day for diagnostic and screening reasons.

Results

Out of 28 prospectively selected patients we included 21 (42 hips), of which 10 were female, with a mean age of 9.25 years and GMFCS levels of I, II and III. Seven out of 28 patients were excluded due to insufficient quality of radiographic images. The absolute differences in MP measured on both conventional supine pelvic and EOS® standing full-leg radiographs ranged between − 8 and 6% with an absolute mean difference of 0% (SD ±3.5) and were not statistically significant (p = 0.99). A Bland-Altman plot showed acceptable agreement between both measurements without proportional bias.

Conclusion

There is no statistical significant difference between the Migration Percentage measured on conventional supine pelvic radiographs and EOS® standing full-leg radiographs in ambulant patients. These images use lower radiation doses and contain more radiographic information.

Trial registration

Approved by the Medical Research Ethics committee of the University Hospitals Leuven (MP001492).
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Metadata
Title
The migration percentage measured on EOS® standing full-leg radiographs: equivalent and advantageous in ambulant children with cerebral palsy
Authors
Jef Neirynck
Renee Proost
Anja Van Campenhout
Publication date
01-12-2019
Publisher
BioMed Central
Keyword
Hip Dislocation
Published in
BMC Musculoskeletal Disorders / Issue 1/2019
Electronic ISSN: 1471-2474
DOI
https://doi.org/10.1186/s12891-019-2746-2

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