In the cervical spine, the greatest amount of rotation is available at which of the following motion segments?
a. C0 to C1
b. C1 to C2
c. C4 to C5
d. C6 to C7
ANS: B
Approximately 55% to 58% of total rotation of the cervical spine occurs at the atlantoaxial joint
(C1 to C2).
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