On developmental screening, an ultrasound of a 6-week-old infant's hip shows the femoral head displaced superolaterally from the acetabulum. The acetabular angle measures 35 degrees. Which radiological line is used to confirm this finding?
- A Perkin's line and Hilgenreiner's line ✓
- B Shenton's line
- C Meyerding's line
- D Bryant's triangle
Correct answer: A. Perkin's line and Hilgenreiner's line
Explanation
Perkin's vertical line drawn from the lateral edge of the acetabulum and Hilgenreiner's horizontal line through the triradiate cartilages are used to assess hip position on pediatric hip X-rays. The femoral head should lie in the inferomedial quadrant formed by these lines. Shenton's line is used in adults for hip fracture or dislocation assessment.
Reference: Caffey's Pediatric Diagnostic Imaging, 12th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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