Coronal shear fracture double arc sign

The lateral radiograph above shows the "double-arc" sign (arrow), characteristic of a fracture of coronal fracture. One arc represents the subchondral bone of the capitellum and the other the lateral ridge of the trochlea.

Reproduced with permission from: McKee MD, Jupiter JB, Bamberger HB. Coronal shear fractures of the distal end of the humerus. J Bone Joint Surg Am 1996; 78:49. Copyright © 1996 The Journal of Bone and Joint Surgery, Inc. https://journals.lww.com/jbjsjournal/pages/default.aspx.

Graphic 142522 Version 1.0

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Coronal shear fracture double arc sign