CONSERVATIVE estimates of the number of persons in the United States with hearing impairment range upward from 3,000,000.1 A large-scale survey of hearing showed that 1 per cent of the population had a severe handicap as evidenced by a loss of 45 decibels or greater, which is of sufficient magnitude to impair hearing for loud speech.2 In the past three decades, surgery and electronic sound amplification (hearing aids) have become practical means for the management of most patients with hearing loss.The innovations that have made surgery effective have been improved knowledge of the complex anatomy and physiology of the . . .
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Schuknecht et al. (1969) studied this question.
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