Rectus femoris injury: bull's eye sign
Football player complains of snapping and pain in left thigh while playing.
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Note bull's eye sign of ruptured deep tendon of rectus femoris. This is best seen on axial sections.
The rectus femoris has two separate origins, the direct head originates from the antero- inferior 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.
- 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
- 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