What should be the first step taken by an orthopedic surgeon when evaluating a child with cavus foot to determine the underlying etiology?

The correct answer is B) Conduct a neurological examination to evaluate for underlying neurological conditions. Cavus foot can be caused by a variety of underlying conditions, including neurological conditions such as Charcot-Marie-Tooth disease, cerebral palsy, spina bifida, polio, and muscular dystrophy. Therefore, it is important for the orthopedic surgeon to evaluate for any neurological deficits that may be contributing to the cavus foot deformity or send the patient to a neurologist. While genetic testing and imaging may be necessary, they should be based on the findings of the initial examination. A thorough physical examination should also be performed, but it may not be sufficient to identify the underlying cause of the cavus foot.