Tympanoplasty

12 Tympanoplasty


Definition


Tympanoplasty type 1, alternatively called myringoplasty, is the reconstruction of the perforated tympanic membrane using a material such as temporalis fascia.


Indications


Perforation of the tympanic membrane.


Anatomical Orientation



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Surgical Steps


Following dissection of the soft tissues, and exposure of the external auditory canal and mastoid, the temporal bone is ready for the procedure. Care has been taken to preserve the tympanic membrane and the skin of the external auditory canal.


EAC: External auditory canal


MT: Mastoid tip


TL: Temporal line


ZR: Zygomatic root



Using a curved micro knife, an incision is made in the skin of the posterior wall of the external auditory canal, at a distance of 3–4mm from the annulus fibrosis, parallel to it.


II: Curved micro knife


MIL: Annulus fibrosis



AF: Annulus fibrosis


HS: Henle spine


TM: Tympanic membrane



Image

Next, a second incision is made superiorly using a No.11 blade or sickle knife. This incision should begin just anterior to the short process of malleus medially, and join the superior edge of the first incision laterally.


II: No.11 blade or sickle knife


MIL: Short process of malleus



Image


Definitions and Tips



  • Annulus fibrosis (fibrous annulus, annulus fibrocartilaginous membrana tympani): Definition: The fibrous tissue encircling the pars tensa of the tympanic membrane. Tips: The fibrous annulus is located in the sulcus of the tympanic annulus. The access passage for the exposure of the tympanic cavity is between the fibrous annulus and the tympanic annulus.
  • The Wullstein classification comprises tympanoplasty types 1–5. In the half century following this classification, it has become insufficient. However, the concept of type 1 and type 3 tympanoplasty is still routinely applied in surgery:

    • type 1 tympanoplasty—tympanoplasty without ossiculoplasty
    • type 3 tympanoplasty—tympanoplasty with the graft positioned on the stapes head
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Jul 4, 2016 | Posted by in OTOLARYNGOLOGY | Comments Off on Tympanoplasty

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