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Radiologists' Diagnostic Performance in Differentiation of Rickets and Classic Metaphyseal Lesions on Radiographs: A

Boaz Karmazyn1, Megan B Marine1, Richard H Jones2

  • 1Department of Radiology and Imaging Sciences, Indiana University School of Medicine, Riley Hospital for Children, 705 Riley Hospital Dr, Rm 1053, Indianapolis, IN 46202.

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Summary

Radiologists accurately differentiate classic metaphyseal lesions (CML) from rickets in children, with high confidence and agreement. Distinct radiographic signs aid in distinguishing these conditions, crucial for child abuse diagnosis.

Keywords:
child abuseclassic metaphyseal lesionradiographsrickets

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Area of Science:

  • Pediatric Radiology
  • Skeletal Dysplasias
  • Child Abuse Diagnosis

Background:

  • Classic metaphyseal lesions (CML) are key indicators of child abuse.
  • Some experts question if CML result from rickets instead of trauma.

Purpose of the Study:

  • To assess radiologists' ability to differentiate rickets from CML on knee radiographs.
  • To evaluate diagnostic performance and interobserver agreement.

Main Methods:

  • Retrospective analysis of knee radiographs from children <2 years with rickets or CML.
  • Eight radiologists independently interpreted images, noting confidence and radiographic signs.
  • Radiographs were cropped and zoomed for consistent presentation.

Main Results:

  • High interobserver agreement for CML (κ=0.89) and rickets (κ=0.92).
  • Radiologists achieved 95.1% sensitivity, 97.0% specificity, and 96.0% accuracy for CML.
  • Distinct radiographic signs were identified for rickets and CML, with <4% overlap.

Conclusions:

  • Radiologists reliably differentiate rickets and CML with high diagnostic performance.
  • Age is a key differentiator: CML are common in infants <6 months, rare after 1 year.
  • Distinct radiographic features enable confident differentiation.