What muscle is primarily responsible for unlocking the tibia when flexing the knee?
a. Sartorius
b. Biceps femoris
c. Popliteus
d. Plantaris
ANS: C
Even though the "unlocking" mechanism for tibial medial rotation is fairly passive, based on the origin and insertion of this muscle, this muscle's primary force is given to medial rotation or unlocking of the tibia.
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