The Lempert one stage horizontal semicircular canal fenestration was the surgical procedure of choice for otosclerosis from 1939 to 1954. Subsequently, mobilization and stape-dectomy replaced fenestration.
In the offices of Drs. Day, Jordan, and Caparosa, the horizontal semicircular canal fenestration was performed from 1940 to 1955; the mobilization, two years; and, thereafter, the stapedectomy. A significant number of patients have had fenestration on one side and stape-dectomy on the opposite ear.
Fifty patients seen consecutively were reviewed. Reliable office audiological testing has been available only in the more recent years; and, therefore, audiological statistical comparison has limited reliability. It is felt, however, that a review of these patients and the study of their surviving hearing results is a worthwhile inferential comparison.