Sound conduction of the diseased ear

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Abstract
The degree of hearing loss associated with various pure lesions of the sound conduction mechanism was studied. These lesions, as existing in patients, were quantitated audiometrically and verified at surgery. Five groups were studied. Patients with isolated perforations of the tympanic membrane were subgrouped by size into 15, 40, 65 and 85%. Patients with interruption of the ossicular chain and perforation of the tympanic membrane, were again subgrouped by size into 40, 65 and 85%. Patients with total loss of the tympanic membrane and ossicular chain, patients with ossicular interruption behind an intact tympanic membrane and patients with ossicular interruption, closure of the oval window and an intact tympanic membrane were also studied. Each study group was analyzed statistically for the pattern of hearing loss. An analysis was made of the altered physiologic components entering into the total hearing loss. Comparisons between the study groups were made.

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