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The cerebral palsy hip classification is reliable: an inter- and intra-observer reliability study
M L Murnaghan1, P Simpson, J G Robin
1Hugh Williamson Gait Laboratory, Royal Children's Hospital, Flemington Road, Parkville, Victoria 3052, Australia.
The Journal of Bone and Joint Surgery. British Volume
|March 2, 2010
Summary
This study validates a new hip morphology classification system for adolescents with cerebral palsy. The system demonstrates excellent reliability and validity for assessing hip displacement in this population.
Area of Science:
- Orthopaedics
- Paediatric Medicine
- Radiology
Background:
- Cerebral palsy (CP) often leads to hip displacement.
- Accurate classification of hip morphology is crucial for managing CP.
- A new classification system for adolescents with closed triradiate cartilage has been reported.
Purpose of the Study:
- To test the reliability and validity of a new hip morphology classification system.
- To evaluate the system's utility in adolescents with cerebral palsy and closed triradiate cartilage.
Main Methods:
- A six-grade ordinal scale classification was used.
- Measurements included migration percentage, Shenton's arch, femoral head deformity, acetabular deformity, and pelvic obliquity.
- Four paediatric orthopaedic surgeons and four physiotherapists assessed 42 hip radiographs twice.
Main Results:
- Inter-observer reliability ranged from 0.88 to 0.94.
- Intra-observer reliability ranged from 0.88 to 0.94.
- The classification demonstrated excellent reliability and validity.
Conclusions:
- The tested hip morphology classification system is reliable and valid for adolescents with cerebral palsy.
- This system can aid in natural history studies, outcome assessments, and clinical communication regarding hip displacement in CP.