A patient's stiff neck turned into severe pain, preventing him from getting up out of bed or even sitting at a desk without neck support. An X-ray revealed what appeared to be a fracture in a patient's spinal bifids. It is possible this fracture was already there as a birth defect. Or, it was the result of recent strenuous activity. If left untreated, the patient could suffer from body paralysis and so neck surgery might then be necessary.
Because a neck bone fracture is potentially paralytic, patients with such symptoms almost always have neck surgery. The appropriate surgery is performed unnecessarily in about 25% of all cases. A newly developed internal scan for the spine is highly accurate, producing 3 misdiagnoses for every 97 correct diagnoses. Clearly, using this test, doctors can largely avoid unnecessary neck surgery without, however, performing any fewer necessary ones than before, since __________.
Which of the following most logically completes the argument?