International Session 5　　Technology

Aim: To investigate whether synchronous ossiculoplasty by double cartilage block(DCB)with autologous tragus could improve hearing outcome of canal-wall-down(CWD)mastoidectomy.Material and Methods: We retrospectively reviewed patients receiving Wullstein type II or III tympanoplasty for CWD mastoidectomy in Kaohsiung Chang Gung Memorial Hospital from 2019 to 2023.We excluded patients with previous middle ear surgery, head and neck malignancy, or middle ear tumor other than cholesteatoma.Ossiculoplasty by commercial prosthesis was also exclude.Results: Total 45 ears(mean age 52 years old)were included.23 cases received synchronous ossiculoplasty with DCB, while the other 22 cases did not.In ossiculoplasty group, mean post-operative air-conduction(AC)threshold improved significantly from 57 to 48 dB HL.Mean air-bone gap(ABG)closure is better than non-ossiculoplasty group(11 0 vs.-2 6, p .001) .Complications including perforation, prosthesis extrusion, facial palsy were not note.Conclusions: Synchronous ossiculoplasty by DCB could improve the hearing outcomes of CWD mastoidecotomy, and the results were sustainable during one year follow-up.