Shimizu Yoshitaka, Goode Richard L
Department of Veterans Affairs, Palo Alto Health Care System, and the Department of Otolaryngology, Head and Neck Surgery, Stanford University School of Medicine, Stanford, CA 94304, USA.
Otolaryngol Head Neck Surg. 2008 Aug;139(2):301-6. doi: 10.1016/j.otohns.2008.04.011.
We evaluated the effect of malleus presence or absence on middle ear sound transmission after middle ear reconstruction in a temporal bone model.
Human cadaveric temporal bone study.
The velocity of the stapes footplate was measured using a laser Doppler vibrometer. After baseline measurements in eight intact temporal bones, reconstructed middle ear transmission with and without the malleus was analyzed. Furthermore, to assess the influence of interposed cartilage, cartilage pieces of three different diameters were inserted and the three test conditions compared.
Reconstruction without a malleus tended to be slightly worse at 0.6 to 3.0 kHz. However, these differences were not statistically significant. In the cartilage experiments, the large-diameter cartilage was the worst at 0.25 kHz and 0.5 kHz but was better than the medium-diameter cartilages at 3.0 kHz and 4.0 kHz (P < 0.05).
Absence of the malleus impaired middle ear sound transmission slightly in the mid frequencies compared to reconstruction with the malleus present; the differences were not statistically significant.
我们在颞骨模型中评估了中耳重建后锤骨存在与否对中耳声音传导的影响。
人体尸体颞骨研究。
使用激光多普勒振动计测量镫骨底板的速度。在对8个完整颞骨进行基线测量后，分析了有锤骨和无锤骨情况下重建的中耳传导情况。此外，为评估插入软骨的影响，插入了三种不同直径的软骨片并比较了三种测试条件。
无锤骨重建在0.6至3.0千赫兹时往往稍差。然而，这些差异无统计学意义。在软骨实验中，大直径软骨在0.25千赫兹和0.5千赫兹时最差，但在3.0千赫兹和4.0千赫兹时优于中直径软骨（P < 0.05）。
与有锤骨的重建相比，无锤骨会使中耳在中频的声音传导略有受损；差异无统计学意义。
