Which of the following describes the lumbar spine facet joint arthrokinematic motion during (L) lateral flexion in the neutral position?
a. Ipsilateral facet moves caudal and anterior; contralateral facet moves caudal and lateral.
b. Ipsilateral facet moves cephalic and posterior; contralateral facet moves caudal and posterior.
c. Ipsilateral facet moves caudal and anterior; contralateral facet moves cephalic and posterior.
d. Ipsilateral facet moves cephalic and medial; contralateral facet moves cephalic and medial.
ANS: C
During lateral flexion to the left, the ipsilateral facet would travel in a caudal direction. Due to the
coupled motion of the spine, there would also be slight rotation of the segment in the opposite
direction; therefore, the ipsilateral facet would move slightly anterior. On the contralateral side, the
facet would move in a general cephalic direction with a slight posterior rotation due to the coupled
motion.
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