Differentiating subluxation from developmental dislocation of the hip

Area of Science:

• Pediatric Orthopedics
• Diagnostic Imaging
• Developmental Dysplasia of the Hip

Background:

• Developmental hip dislocation and severe subluxation present identical clinical and radiological features.
• Accurate differential diagnosis is crucial as treatment strategies vary significantly between conditions.

Observation:

• A novel approach utilized the abduction/internal rotation (AIR) radiograph to distinguish between hip subluxation and dislocation.
• In subluxations, the femoral head relocates into the acetabulum on the AIR view, indicated by Shenton's line reconstitution, unlike true dislocations.

Findings:

• Five pediatric patients with delayed hip dysplasia diagnosis were evaluated.
• The AIR view successfully identified hip subluxation, enabling treatment with an Ilfeld abduction splint without necessitating arthrography, anesthesia, or casting.

Implications:

• The AIR view is a valuable tool for accurate diagnosis of hip subluxation, preventing overdiagnosis of dislocation.
• This non-invasive imaging method can help avoid unnecessary diagnostic and therapeutic interventions, improving patient outcomes and treatment assessment.