Radiograph of the pelvis (image 1) shows findings of right-s | Figure 1

CincyKidsRad

Cincinnati Children's Radiology

Radiograph of the pelvis (image 1) shows findings of right-sided developmental dysplasia of the hip. The right femoral head is smaller than the left, the right acetabular angle is steeper than the left, and the right hip is subluxed superolaterally. A fluoroscopic image (image 2) was obtained during arthrogram and hip reduction for hip dysplasia. The arthrogram shows that the majority of the femoral head is cartilaginous and not visible on x-ray. Developmental hip dysplasia is usually treated by placing the child in a Pavlik harness. #MSKMonday

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AP (image 1) and frog leg (image 2) views of the pelvis in an infant show dysplasia of the left hip. What are the findings on these radiographs that allow you to make this diagnosis? #FridayQuizDay #FridayQuiz

Image description AP pelvis radiograph (image 1) shows lateral displacement of the right femoral head (arrow) from the acetabulum. Axial (image 2) and three-dimensional reconstructed (image 3) CT images show posterior and lateral dislocation of the hip (arrow) with external rotation of the femoral head.

Teaching point Posterior hip dislocation typically results from high-energy trauma. On physical examination, the affected limb is classically shortened, flexed, adducted, and internally rotated, reflecting posterior displacement of the femoral head. CT is used to assess alignment, identify associated fractures, and evaluate for intra-articular fragments following reduction.

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