Normal TM thickness is 0.1mm,if we use 3mm of cartilagewhat will the impact on hearing??
it is hard to guess, the calcification of ossicular joints (incudo-malleolar and incudo-stapedial) will determine the outcome
Some research has been done regarding this question:
Experimental investigations of the use of cartilage in tympanic membrane reconstruction. Zahnert T, Hüttenbrink KB, Mürbe D, Bornitz M. Am J Otol. 2000 May;21(3):322-8.
[Acoustic and mechanical properties of tympanic membrane transplants]. Zahnert T, Bornitz M, Hüttenbrink KB. Laryngorhinootologie. 1997 Dec;76(12):717-23. German.
To be complete tympanosclerosis does influence hearing (certain frequencies up to 2-3 dB, yet not within detectable amount with common audiometry as steps of 5 dB are tested.
Still the question will remain IF the amount of hearing loss with cartilage usage is of clinal relevance as it is done for other reasons.
Kind regards
Here's one. Golden oldie.
Arch Otolaryngol Head Neck Surg. 1989 Aug;115(8):931-5.
Hearing loss in tympanosclerosis caused by grommets.
Tos M1, Stangerup SE.
Although hearing loss is very small, its there. Measured only on three Frequencies!
only myringosclerosis cases.
it is to be expected though if the tympanic membrane is less of a membrane.
but again, even so it will remain to be clinally irrelevant.
kind regards
The 0.3 mm cartilaginous T.M will cause severe loss to conductive hearing.
How the Thick cartilage causes severe conductive hearing loss??
Thickness of human T M is 0.1 mm so any thing above (about 0.3 mm) is not capable of producing any vibration . Our question of 3 mm is 30 times more.
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