Abstract: Objective To explore the clinical method to obliterate mastoid-cavity being and renovate ear canal posterior-wall by using various mesodermal-tissue grafts of postauricular region and mastoid cortex-bone pate in canal wall-down tympanoplasty (CWdT) to treat chronic suppurative otitis media or cholesteatoma otitis media. Methods From January 2011 to December 2013, 21 cases of patients with the two types of otitis media mentioned above were subjected to the procedure. Results After more than 6 months of follow-up, except for one case who succeeded in dry ear with small eardrum perforation, all the other cases presented a dry ear, with slightly big canal and no secretion or recurrence of cholesteatoma. The posterior-walls of the canal were smooth without perforation on eardrum, and the obtuse angle was not formed between the inner upper of posterior-wall and the new eardrum. The rate of dry ear was 100%, and the rate of eardrum healed was 95.2%. Conclusion Self postauricular mesodermal-tissue graft and mastoid cortex-bone pate are simple methods to obliterate mastoid cavity and renovate posterior-wall of ear canal. After the procedure, the repairing tissue heals well with no liquefaction or necrosis. Long-term follow up confirms that the canal is slightly bigger and stable. Physiological states, such as shape, epithelization and skin color of the posterior-wall of the ear canal are satisfying.

Key words: Mesodermal tissue, Ear canal, Canal wall-down tympanoplasty, Surgical renovation, Bone pate