The sequelae of septic hip arthritis in children: a revised classification and case review

Area of Science:

• Orthopedic Surgery
• Pediatric Orthopedics
• Radiographic Classification Systems

Background:

• Current classification systems for pediatric septic arthritis of the hip (SAH) sequelae are complex and may hinder accurate treatment planning.
• A need exists for a simplified, reproducible radiographic classification to evaluate hip joint structural integrity after SAH.

Purpose of the Study:

• To introduce and validate the Xi'an Honghui Hospital Paediatric Orthopaedic Classification (HHPO classification) for pediatric SAH sequelae.
• To compare the reliability of the HHPO classification against the existing Choi system.
• To assess the clinical utility of the HHPO classification in treatment planning and prognostic evaluation.

Main Methods:

• Retrospective analysis of pelvic radiographs from 18 pediatric patients with SAH.
• Development of the HHPO classification based on femoral head/neck integrity and acetabular relationship.
• Comparison of interobserver reliability and intraobserver consistency between HHPO and Choi classifications using six independent observers.

Main Results:

• The HHPO classification demonstrated significantly higher inter- and intraobserver agreement than the Choi classification.
• Distribution of cases by HHPO: Type IA (n=5), IB (n=6), ID (n=2), IIA (n=3), IIB (n=2).
• Earlier infection onset correlated with more severe sequelae; 88.9% hips had satisfactory range of motion, 72.2% were radiologically stable.

Conclusions:

• The HHPO classification is a simpler and more reproducible tool for assessing pediatric SAH sequelae.
• The HHPO system shows potential clinical utility for guiding treatment and predicting outcomes in pediatric hip joint sequelae.
• This novel classification aids in managing the long-term structural and functional consequences of septic arthritis of the hip in children.