Dai Chenkai, Cheng Tao, Wood Mark W, Gan Rong Z
University of Oklahoma, Norman, OK 73019, USA.
Hear Res. 2007 Aug;230(1-2):24-33. doi: 10.1016/j.heares.2007.03.006. Epub 2007 Apr 20.
The aim of this study is to investigate the function of the superior malleolar ligament (SML) and the anterior malleolar ligament (AML) in human middle ear for sound transmission through simulations of fixation and detachment of these ligaments in human temporal bones and a finite element (FE) ear model. Two laser vibrometers were used to measure the vibrations of the tympanic membrane (TM) and stapes footplate. A 3-D FE ear model was used to predict the transfer function of the middle ear with ligament fixation and detachment. The results demonstrate that fixations and detachments of the SML and AML had different effects on TM and stapes footplate movements. Fixation of the SML resulted in a reduction of displacement of the TM (umbo) and the footplate at low frequencies (f<1000 Hz), but also caused a shift of displacement peak to higher frequencies. Fixation of both SML and AML caused a reduction of 15 dB at umbo or stapes at low frequencies. Detachment of the SML had almost no effect on TM and footplate mobility, but AML detachment had a minor effect on TM and footplate movement. The FE model was able to predict the effects of SML and AML fixation and detachment.
本研究旨在通过模拟人类颞骨中这些韧带的固定和分离以及有限元（FE）耳部模型，研究上踝韧带（SML）和前踝韧带（AML）在人中耳声音传导中的功能。使用两台激光振动计测量鼓膜（TM）和镫骨底板的振动。使用三维FE耳部模型预测韧带固定和分离时中耳的传递函数。结果表明，SML和AML的固定和分离对TM和镫骨底板运动有不同影响。SML的固定导致TM（鼓膜脐）和底板在低频（f<1000 Hz）时位移减小，但也导致位移峰值向高频移动。SML和AML的固定均导致低频时鼓膜脐或镫骨处声压级降低15 dB。SML的分离对TM和底板的活动性几乎没有影响，但AML的分离对TM和底板运动有轻微影响。FE模型能够预测SML和AML固定和分离的影响。
