Acetabular dysplasia presenting as developmental dislocation of the hip

Area of Science:

• Pediatric Orthopedics
• Developmental Dysplasia of the Hip

Background:

• Developmental dysplasia of the hip (DDH) is a common condition in children.
• Acetabular dysplasia, a risk factor for DDH, involves inadequate coverage of the femoral head by the acetabulum.

Observation:

• A cohort of eleven hips in nine children presented with acetabular dysplasia.
• Clinical signs typically associated with hip dislocation, such as tight abductors and limping, were absent.
• Standard radiographs did not show the characteristic femoral head protrusion indicative of dislocation.

Findings:

• Arthrography confirmed acetabular dysplasia in all cases.
• Crucially, arthrography revealed no evidence of hip dislocation in any of the children.
• This highlights a subset of acetabular dysplasia cases that lack overt dislocation signs.

Implications:

• Accurate grading of hip dysplasia is essential for correct diagnosis.
• Misdiagnosis of acetabular dysplasia as hip dislocation can occur, complicating management.
• Improved diagnostic methods and grading systems are needed to address this recurring clinical challenge.