Anatomy & Physiology for Health Professions 3rd Edition by Bruce Colbert,Jeff Ankney,Karen Lee

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Answer the following:
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.