Which of the following statements is true concerning the surface of the sacroiliac joints?
a. The sacral surface is formed from the fused bodies of S1 to S4.
b. Both the sacral and innominate articular surfaces are covered with fibrocartilage.
c. There is a pattern of elevations and ridges only on the sacral surfaces.
d. The innominate articular surface is "C" shaped.
ANS: D
The articular surface of the sacrum is "C" shaped and covered with hyaline cartilage. The
corresponding surface of the ilia is also "C" shaped but is covered with fibrocartilage. After
puberty, grooves and ridges appear on both surfaces to restrict excessive motion.
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