Anatomical relationship between the morphology of the styloid process of the ulna and the attachment of the radioulnar ligaments.
Anatomical relationship between the morphology of the styloid process of the ulna and the attachment of the radioulnar ligaments.
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DOI：
10.1111/joa.13275
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发表时间：
2020-12
影响因子：
2.4
通讯作者：
Akita K
中科院分区：
文献类型：
--
作者：
Horiuchi S;Nimura A;Tsutsumi M;Suzuki S;Fujita K;Nozaki T;Akita K
尺桡韧带是动态载荷下远端尺桡关节的主要稳定物；然而，关于它们附着在尺骨茎突中部和远端三分之一的解剖细节尚不清楚。由于以前的解剖研究只包括老年尸体，他们的解剖发现可能不能反映年轻和健康标本的形态学特征。本研究利用磁共振成像（MRI）研究了尺骨远端，特别是茎突的解剖特征，以确定尺桡韧带与茎突的附着，并验证其方向和与茎突的附着。我们使用微型计算机断层扫描（micro - CT）研究了12具尸体手腕的远端尺骨的形态学特征。我们还可视化和测量了皮质骨厚度的分布。我们对三个标本进行了轴面组织学分析，并对七个标本进行了宏观分析，以检查尺桡韧带与茎突的附着。此外，我们使用3.0特斯拉MRI评估了5个活体志愿者的手腕。尺骨远端茎突的背桡侧有一个脊状突起，与尺桡韧带的附着相对应。数据处理后的显微CT图像显示，茎突近端背桡象限的皮质厚度比其他象限厚（p < 0.01），中端背桡象限（p = 0.021）和尺骨掌象限（p < 0.01）的皮质厚度比其他象限厚。组织学分析显示，尺桡韧带通过软骨突起连接到茎突中部和远端三分之一处。在茎突中部三分之一处纤维方向为背向，在茎突远端三分之一处纤维方向变为掌向。在年轻健康的参与者中，使用MRI确认了尺骨桡韧带在茎突上的方向和附着。尺桡韧带附着于茎突背桡脊，通过骨皮质增厚、附着部位组织学和体内磁共振成像证实了这一点。尺桡韧带方向立体相交，既满足滑动稳定性又满足旋转灵活性。这些解剖结果可以为远端尺桡关节稳定的生物力学考虑提供基础。我们观察到尺骨远端茎突在其背桡侧有一个脊状突起，与桡尺韧带的软骨突相对应。尺桡韧带方向立体相交，可以更好地满足滑动稳定性和旋转灵活性。
The radioulnar ligaments are the major stabilizers of the distal radioulnar joint under dynamic loading; however, anatomical detail regarding their attachment on the middle and distal thirds of the styloid process of the ulna remains unclear. Because previous anatomical studies included only old cadavers, their anatomical findings might not reflect the morphological features of younger and healthy specimens. This study investigated the anatomical features of the distal ulna, particularly the styloid process, to determine the attachment of the radioulnar ligaments to the styloid process and verified their direction and attachment to the styloid process in younger and healthy donors using magnetic resonance imaging (MRI). We investigated the morphological features of the distal ulna of 12 cadaveric wrists using micro‐computed tomography (micro‐CT). We also visualized and measured the distribution of the cortical bone thickness. We histologically analyzed three specimens in the axial plane and macroscopically analyzed seven specimens to examine the attachment of the radioulnar ligaments to the styloid process. In addition, we evaluated five wrists from living volunteers using 3.0 Tesla MRI. The distal ulna has a ridge on the dorsoradial aspect of the styloid process that corresponds to the attachment of the radioulnar ligaments. Micro‐CT images after data processing revealed that the cortical thickness of the dorsoradial quadrant was thicker than that of the other quadrant at the proximal slice of the styloid process (p < 0.01), and that of the dorsoulnar (p = 0.021) and ulnopalmar (p < 0.01) quadrants at the middle slice. Histological analyses showed that the radioulnar ligaments were attached to the middle and distal thirds of the styloid process via chondral‐apophyseal entheses. The direction of the fiber was dorsal in the middle third of the styloid process and changed to palmar in the distal third of the styloid process. The direction and attachment of the radioulnar ligaments on the styloid process were confirmed using MRI for younger and healthy participants. The radioulnar ligaments were attached to the dorsoradial ridge of the styloid process, which was confirmed by cortical bone thickening, histology at the attachment sites, and in vivo MR imaging. The directions of the radioulnar ligaments sterically intersected, which would satisfy both slipping stability and rotational mobility. These anatomical findings may provide the basis for biomechanical consideration of distal radioulnar joint stabilization. We observed that the styloid process of the distal ulna had a ridge on its dorsoradial aspect, corresponding to the chondral‐apophyseal entheses of the radioulnar ligaments. The directions of the radioulnar ligaments were sterically intersected, which may better satisfy both slipping stability and rotational mobility.
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影响因子：
3.5
作者：
Tamaki, Tatsuya;Nimura, Akimoto;Akita, Keiichi
通讯作者：
Akita, Keiichi
影响因子：
1.9
作者：
Haugstvedt, JR;Berger, RA;An, KN
通讯作者：
An, KN
影响因子：
1.9
作者：
PALMER, AK;WERNER, FW
通讯作者：
WERNER, FW
影响因子：
4.2
作者：
Rein, Susanne;Semisch, Manuel;Hagert, Elisabet
通讯作者：
Hagert, Elisabet
影响因子：
1.1
作者：
Hagert, Elisabet;Hagert, Carl-Goran
通讯作者：
Hagert, Carl-Goran