Radiographic analysis to determine the treatment outcome in developmental dysplasia of the hip

Area of Science:

• Pediatric Orthopedics
• Radiology
• Developmental Dysplasia of the Hip

Background:

• Developmental dysplasia of the hip (DDH) is a common condition in infants.
• Early diagnosis and treatment are crucial for optimal outcomes.
• Predicting treatment success based on initial presentation can guide clinical decisions.

Purpose of the Study:

• To evaluate if pretreatment radiographic measurements in infants under 6 months with hip dislocation can predict the success of splinting treatment.
• To identify specific radiographic parameters associated with treatment failure.

Main Methods:

• Retrospective review of 35 patients (44 hips) under 6 months with hip dislocation from one institution.
• Analysis of pretreatment anteroposterior radiographs measuring superior and medial hip gaps.
• Comparison with an aged-matched cohort of 20 patients (23 hips) from a second institution.
• Statistical analysis of radiographic measurements, patient age, and splint type (Pavlik harness vs. other orthoses).

Main Results:

• A high failure rate (66-70%) was observed with splinting in dislocated hips across both institutions.
• Abnormal superior and medial hip gaps were consistent predictors of splinting success or failure.
• Specifically, a superior gap ≤ 3 mm or a medial gap ≥ 10 mm indicated likely splinting failure.

Conclusions:

• Pretreatment radiographic assessment of superior and medial hip gaps is vital in infants with hip dislocation.
• Infants with specific gap measurements (superior ≤ 3 mm or medial ≥ 10 mm) are unlikely to benefit from initial splinting treatment.
• These findings suggest alternative treatment strategies should be considered for infants with these radiographic indicators.