The results of 100 cases of reoperation among 600 tympanoplasties were analyzed and discussed. The primary operations were tympanoplasty, simple mastoidectomy and radical or modified radical mastoidectomy. The summary is as follows;
1. In the group of retympanoplasty, type III is the most frequent type and then type I, type IV and type II in decreasing order.
2. The better results were obtained in the cases of which primary surgery had been done in another clinic. This fact means that the primary operation had been done in poorer condition than in our clinic.
3. The results of the cases operated on other than tympanoplasty are satisfactory, especially the cases operated on primarily radical is the most convenient for the tympanoplasty.
4. Successful results were obtained in all cases with hearing loss of less than 30 dB and only 31 Z of the cases with hearing loss of more than 61 dB showed good results. 5. In the retympanoplasty, atticotomy is absolutely necessary to get a good result, even though it has been done in the primary operation.
6. The cases in which the reconstruction of posterior meatal wall or the mastoid obliteration combined with tympanoplasty have been achieved show good result of over 87%.
7. The result of ossicular reconstruction in type III is same to that of the original type E. In type IV, the reconstruction showed no success in all cases.
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