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在小耳症及无耳畸形中可以见到听小骨畸形,而罕见的是外耳道、耳廓、鼓膜正常而听小骨有畸形的病例。在这样的病例中畸形只限于一小部分,提示发育障碍的范围极为狭小。作者船坂氏在1971年报告了4耳,其后又经治了18耳先天性听小骨畸形,把它们分为砧蹬关节形成不全、锤骨砧骨固定、蹬骨固定三组。作者这次把砧蹬关节形成不全暂时命名为砧蹬关节离断症来报告,阐述作者对这种畸形的成因及手术等的见解。在这一组中的6名8耳因无耳廓,耳道、鼓膜异常的传音性听力障碍,
In small ear disease and ear-free deformity can be seen hearing ossicles deformity, and rare external auditory canal, auricle, tympanic membrane normal and hearing a small bone deformity cases. In such cases the deformity is limited to a small fraction, suggesting a very narrow range of developmental disorders. The author Sakasaka's report of 4 ears in 1971, followed by 18 ears of congenital hearing ossicles deformity, divided them into ankle joint formation, mandibular incus fixation, fixation of the three groups. This time, the author of the ankle joint incompletely named as an ankle joint off syndrome to report, explain the author of the causes of such deformity and surgery and other insights. Six of the 8 ears in this group were hearing-impaired hearing aids without an auricle, ear canal, tympanic membrane,