PEDIATRICS Vol. 90 No. 4 October 1992, pp. 633-636
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Patterned Abusive Bruises of the Buttocks and the Pinnae

KENNETH W. FELDMAN MD1

1 General Pediatric Division, Department of Pediatrics, University of Washington School of Medicine, The Children's Hospital and Medical Center, Seattle, Washington

Patterned bruises often result from abusive injuries. The bruise pattern commonly mimics the injuring object.1 With high-velocity injuries, like whippings or slaps, an unbruised negative image of the cord or hand may be outlined by a fine rim of petechae. At the margin of an injuring object, high-velocity impact stretches capillaries sufficiently to tear them. This may occur even when the force does not crush directly impacted vessels. Greater forces rupture directly impacted vessels creating in addition a positive image bruise of the object. If severe forces are applied more slowly, the elastic limit of the capillaries at the margins will not be exceeded.

Submitted on March 3, 1992
Accepted on April 22, 1992




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