Citation, DOI & article data
The double-arc sign, also known as the McKee double-arc sign, is a radiographic indication of a coronal shear fracture of the distal humerus, which involves the capitellum and extends beyond the lateral trochlear ridge to include a part of the trochlea 1,2.
The double-arc sign is characterized on a lateral radiograph of the elbow by two separately visible arcs representing the displaced capitellum and the trochlea 1,2.
History and etymology
Michael McKee is a Canadian orthopedic surgeon who first published about the double-arc sign in 1996 when he was a Fellow at Massachusetts General Hospital 2.
- 1. Scott W. Wolfe, Robert N. Hotchkiss, William C. Pederson et al. Green's Operative Hand Surgery. (2016) ISBN: 9781455774272 - Google Books
- 2. McKee M, Jupiter J, Bamberger H. Coronal Shear Fractures of the Distal End of the Humerus. J Bone Joint Surg Am. 1996;78(1):49-54. doi:10.2106/00004623-199601000-00007 - Pubmed