References regarding Sign of the Buttock
[Evans2001]  Ronald C. Evans.
Illustrated Orthopedic Assessment.
St. Louis: Mosby (2001).
Unless specifically noted above, references used in the construction of this web page include the following:
[FMU] Lecture notes from Functional Medicine University.
[SCNM] Lecture notes from Southwest College of Naturopathic Medicine.
[UT] Lecture notes from the University of Tennessee graduate programs in Chemistry, Microbiology, and Biochemistry.