除需有良好的咽鼓管通气、引流功能外，鼓室成形术成败的重要问题是鼓膜移植物的支撑，对预防术后因瘢痕、粘连造成植片内陷，新鼓室含气腔缩小和听力改善至关重要。在行保留耳道后壁的闭式乳突根治术时，须部分或全部去除上鼓室侧壁，扩大鼓窦入口，因而鼓膜移植物缺少支撑而 In addition to the need for good Eustachian tube ventilation, drainage function, tympanoplasty is an important issue of success or failure of the tympanic membrane graft support, to prevent postoperative scarring, adhesions caused by invagination, the new tympanic cavity with reduced hearing and hearing Improvement is paramount. In the line to retain the posterior wall of the ear canal closed radical mastoidectomy, the tympanic wall to be partially or completely removed to expand the entrance to the drum, and lack of support for the tympanic membrane graft