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Factors affecting visualization of posterior rib fractures in abused infants
P K Kleinman1, S C Marks, V I Adams
1Department of Radiology, University of Massachusetts Medical Center, Worcester 01655.
Insights
Detecting rib fractures in abused infants is challenging due to their location. Radiographic visibility is limited by overlapping anatomy and fracture orientation, often requiring advanced imaging for accurate diagnosis.
Area of Science:
- Pediatric Radiology
- Forensic Imaging
- Child Abuse Detection
Background:
- Posterior rib fractures are common in abusive head trauma and infant abuse.
- Acute fractures near costovertebral articulations are often radiographically occult.
- Callus formation is typically the first sign of these injuries.
Purpose of the Study:
- To identify factors affecting the radiographic visibility of posterior rib fractures in abused infants.
- To correlate radiological findings with pathological data for improved diagnostic accuracy.
Main Methods:
- Retrospective analysis of 103 posterior rib fractures in 16 abused infants.
- Radiological assessment of plain film studies.
- Correlation with pathological findings in 15 ribs from four patients.
Main Results:
- Limited visibility is due to transverse process superimposition, oblique fracture lines, and preserved periosteum.
- Nondisplaced fractures are often missed on frontal projections.
- Axial views with postmortem radiography clearly define fresh, invisible fractures.
Conclusions:
- Understanding visibility factors aids in diagnosing infant abuse.
- Explains the higher sensitivity of radionuclide bone scans over radiography for acute posterior rib fractures.
- Highlights the need for specific imaging techniques in suspected cases.
Abstract:
Rib fractures frequently are encountered in abused infants and commonly occur in the posterior rib arcs. Fractures occurring near the costovertebral articulations are rarely identified radiographically in the acute phase, and callus formation usually is the first indication of injury. To assess the factors influencing the visibility of fractures near the costovertebral articulations in abused infants, 103 posterior rib fractures occurring in 16 abused infants were studied radiologically. The plain radiologic studies were correlated with the pathologic findings in 15 ribs from four patients. The limited visibility of fractures relates to (1) the frequent superimposition of the transverse process over the rib fracture site, (2) a fracture line that crosses at an obliquity to the radiographic beam, and (3) nondisplacement of rib fragments due to preservation of the posterior periosteum. Fresh fractures invisible on a frontal projection are clearly defined when the rib is viewed axially with postmortem radiography. These findings explain the reported superior sensitivity of radionuclide bone scans vs radiography in the identification of fresh posterior rib fractures. A knowledge of the factors influencing the visibility of these important injuries is useful in planning an appropriate diagnostic evaluation in cases of suspected infant abuse.