Bull's eye sign of rectus femoris injury
Footballer complains of snapping and pain in left thigh whilst playing
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Note bull's eye sign of ruptured deep tendon of rectus femoris. This is best seen on axial sections.
Coronal plane shows the deep tendon leading into the region of the tear, where there is a wavy contour of the deep tendon with surrounding edema.
The rectus femoris has two separate origins, the direct head originates from the anteroinferior iliac spine and indirect head from the superior acetabular ridge. Both these heads unite to form the deep musculotendinous junction.
The "bull's eye sign" was a term coined by Hughes et al to represent increased signal around the deep musculotendinous junction, which is thought to represent an intramuscular degloving injury of the muscle fibers from the indirect head, while the peripheral direct head fibers remain intact.
- 1. Normal Anatomy and Strains of the Deep Musculotendinous Junction of the Proximal Rectus Femoris: MRI Features Soterios Gyftopoulos, Zehava Sadka Rosenberg, Mark E. Schweitzer, and Marcelo Bordalo-Rodrigues AJR March 2008 190:W182-W186; doi:10.2214/AJR.07.2947
- 2. Hughes CT, Hasselman CT, Best TM, et al. Incomplete, intrasubstance strain injuries of the rectus femoris muscle. Am J Sports Med 1995; 23:500 –506