ENT Department, University of Regensburg, Regensburg, Germany.
Otol Neurotol. 2011 Jun;32(4):610-5. doi: 10.1097/MAO.0b013e318213af4d.
To examine the anatomical relationship of the angles between tympanic membrane and stapes footplate and the variation of these angles among different temporal bones in order to characterize the optimal shape of total ossicular reconstruction prostheses (TORPs).
Ten specimens of human temporal bones were prepared for examination with micro-computed tomography. Five of the 10 temporal bones were implanted with 3 types of TORPs before subjecting them to micro-computed tomography. The angles between tympanic membrane and stapes footplate were determined. The contact of the TORPs to these structures was assessed.
The angle between the stapes footplate and the tympanic membrane was, on average, 25.9 degrees in a plane along the transverse axis of the stapes footplate and 24.6 degrees in a plane along the longitudinal axis of the stapes footplate. Consideration of these angles in TORPs resulted in an optimal contact with the tympanic membrane and stapes footplate, especially for prostheses with a large foot.
TORPs should be adjusted in shape before insertion into the middle ear. Further developments should consider prostheses with preadjusted angles or appliances for the exact modification of the prostheses during surgery.
研究鼓膜与镫骨足板之间角度的解剖关系以及这些角度在不同颞骨之间的变化，以确定全听骨重建假体（TORP）的最佳形状。
对 10 个人类颞骨标本进行了微计算机断层扫描检查。在对 10 个颞骨标本进行微计算机断层扫描之前，其中 5 个颞骨标本植入了 3 种 TORP。确定了鼓膜与镫骨足板之间的角度。评估了 TORP 与这些结构的接触情况。
在沿着镫骨足板横轴的平面上，镫骨足板与鼓膜之间的角度平均为 25.9 度，在沿着镫骨足板纵轴的平面上为 24.6 度。在 TORP 中考虑这些角度可实现与鼓膜和镫骨足板的最佳接触，尤其是对于具有较大足板的假体。
在将 TORP 插入中耳之前，应调整其形状。进一步的发展应考虑具有预调整角度的假体或用于在手术中精确修改假体的器具。
