Gibson Daren, Gluth Michael B, Whyte Andy, Atlas Marcus D
Radiology Department, Queen Alexandra Hospital, Southwick Hill Road, Cosham, Portsmouth, Hampshire, PO6 3LY, UK.
Surg Radiol Anat. 2012 Oct;34(8):781-5. doi: 10.1007/s00276-011-0896-5. Epub 2011 Nov 26.
To define the rotational anatomy of the osseous spiral lamina (OSL) at the hook region and along the basal turn of the cochlea and to illustrate the potential utility of high-resolution MRI images to study inner ear ultrastructure.
Retrospective review of high-resolution temporal bone MRI images in 20 consecutive adult patients referred for imaging unrelated to hearing loss. The main outcome measure utilised images in an oblique sagittal plane to measure the rotation of the OSL relative to the vertical axis in the hook region and along the basal turn of the cochlea.
The right OSL is noted to rotate in a clockwise direction as one proceeds anteriorly; over the same distance, the left OSL rotates in an anti-clockwise direction. The average overall rotation for all subjects as measured over a distance of 1-7 mm from the posterior margin of the round window was 25.95°. Inter-subject variability was noted.
Prominent rotation of the OSL was noted in the hook region, this being most pronounced in the proximity to the round window. This concept may have implications for cochleostomy site selection with implant surgery. The study highlights the feasibility of high-resolution MRI to be used to systematically study variations in intra-cochlear anatomy.
明确骨螺旋板（OSL）在钩区及沿耳蜗底转的旋转解剖结构，并说明高分辨率MRI图像在研究内耳超微结构方面的潜在用途。
回顾性分析20例连续成年患者的高分辨率颞骨MRI图像，这些患者因与听力损失无关的原因接受成像检查。主要观察指标是利用斜矢状面图像测量OSL在钩区及沿耳蜗底转相对于垂直轴的旋转角度。
发现右侧OSL向前走行时呈顺时针旋转；在相同距离内，左侧OSL呈逆时针旋转。从圆窗后缘起1 - 7毫米距离内测量，所有受试者的平均总旋转角度为25.95°。观察到个体间存在差异。
在钩区观察到OSL有明显旋转，在靠近圆窗处最为明显。这一概念可能对植入手术的蜗窗造口部位选择有影响。该研究强调了高分辨率MRI用于系统研究耳蜗内解剖结构变异的可行性。
