Location

Wrist

Diagnosis

Wrist fracture

Discussion

Lateral wrist x-ray reveals abnormal bulging of a fat plane adjacent to an area of underlying osseous injury. The ventral bulging of the fat plane overlying the pronator quadratus muscle has been coined the “pronator sign” (Figure A, normal pronator fat pad; Figure B, displaced pronator fat pad). Although it typically means underlying fracture is present, it may also be seen in simple soft-tissue injury of the same region. It is a good sign and should alert the radiologist of possible fracture when present.

Reference

Zimmers TE: Fat plane radiological signs in wrist and elbow trauma. Am J Emerg Med 1984 Nov;2(6):526-32.

Figures

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