作者首先指出各种类型中耳结构的重建对声音传导的效果是众人皆知的,但中耳乳突手术引起外耳解剖变形对声音传导的影响知识很少,而后者却是很重要的。作者认为中耳乳突手术后的听阈改变并不完全由于中耳或内耳的功能变化, The authors first point out that the effects of reconstruction of various types of middle ear structures on sound conduction are well known, but knowledge of the effects of anatomic deformities of the middle ear on mastoid processes on sound conduction is rare, while the latter is important. The authors believe that the auditory threshold after mastoid process of the middle ear is not entirely due to changes in the function of the middle or inner ear,