Consider the motion of bringing the left knee to the chest. During normal arthrokinematics of the hip joint, the left femoral head glides (or spins in neutral) on the acetabulum during this motion:
a. Anteriorly/inferiorly
b. Anteriorly/superiorly
c. Posteriorly/inferiorly
d. Posteriorly/superiorly
ANS: C
In this open kinetic chain motion, the convex femoral head will move posterior and inferior on the concave acetabulum.
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