Anatomy, Physiology, and Disease 3rd Edition by Karen Lee,Jeff Ankney,Bruce Colbert

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Choose the best answer:
A young gymnast falls from the balance beam, rotating her knee. This is a problem because:
A) the knee is a hinge joint and should not rotate
B) the knee should only rotate when standing
C) the knee joint is not a freely moving joint
D) there is no problem, knees are supposed to rotate