作者对Meir医院耳鼻喉科1971至1979年间所行的四类不同慢性中耳炎手术1,280耳中首次手术的798耳用电子计算机分析了听骨损害的类型和频率。结果:(1)上鼓室上皮样胆脂瘤97耳,82.5％有听骨损害,1个听骨完全被破坏者为64.3％。(2)内陷袋胆脂瘤30耳,83.3％有听骨损害;至少有1个听骨完全被破坏者为33.3％。(3)不张耳42(大多为Ⅳ度),66.7％有听骨 The authors analyzed the type and frequency of ossicular lesions in 798 ears of the first surgery in 1,280 ears of four different types of chronic otitis media performed in the Department of Otolaryngology, Meir Hospital from 1971 to 1979. Results: (1) 97 cases of tympanic cholesteatoma were tympanic, 82.5% had ossicular damage, and 64.3% were completely destroyed by one ossicular. (2) There were 30 ears with cholesteatoma and 83.3% with osteosynthesis; 33.3% had at least one hematocele completely destroyed. (3) No Zhang Er 42 (mostly grade Ⅳ), 66.7% had ossicles