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Radiographic threshold values for hip screening in cerebral palsy
Gunnar Hägglund1, Henrik Lauge-Pedersen, Måns Persson
1Department of Orthopaedics, Lund University Hospital, 221 85, Lund, Sweden, gunnar.hagglund@ort.lu.se.
Journal of Children'S Orthopaedics
|March 25, 2009
Summary
Migration percentage (MP) is sufficient for screening hip dislocations in children with cerebral palsy (CP). An MP of 33% or higher warrants observation, while 40% or higher may require surgery.
Area of Science:
- Orthopedics
- Pediatric Radiology
- Cerebral Palsy Research
Background:
- Hip screening is crucial for children with cerebral palsy (CP) to prevent dislocations.
- Standard radiographic measurements like acetabular index (AI) and migration percentage (MP) are used.
- Understanding the efficacy of different thresholds is vital for optimal management.
Purpose of the Study:
- To evaluate the impact of various radiographic measurements and threshold values for hip screening in children with CP.
- To determine the most effective screening parameters for identifying hip dislocations.
Main Methods:
- Analysis of 1,067 standardized hip radiographs from 272 children with CP (born 1992-1998).
- Measurement of acetabular index (AI) and migration percentage (MP) for each radiograph.
- Comparison of threshold values for AI and MP to assess their predictive accuracy.
Main Results:
- Lateral femoral head displacement occurred frequently, often preceding acetabular dysplasia.
- A significant proportion of hips with elevated AI or MP values normalized without intervention.
- Hips with MP >= 40% showed increased lateral displacement, suggesting a need for surgery.
Conclusions:
- Migration percentage (MP) measurement alone is adequate for screening hip dislocations in children with CP.
- An MP threshold of 33% is recommended for initiating observation or intensified monitoring.
- For MP values between 33-40%, treatment decisions should integrate clinical signs and MP progression.
