The "screw home" mechanism involves:
A. Hamstring muscle contracting, leading to knee extension
B. Plantaris muscle contraction initiates the knee rotation and flexion
C. Popliteus muscle contraction leading to knee rotation and the start of unlocking
D. Screw home cannot occur if the quadriceps are relaxed
E. The pes anserine muscles contracting to unlock the knee
Answer: C
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Biomechanics
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