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Anatomical relationship between the morphology of the styloid process of the ulna and the attachment of the radioulnar ligaments

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 cad...

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Published in:Journal of anatomy 2020-12, Vol.237 (6), p.1032-1039
Main Authors: Horiuchi, Saya, Nimura, Akimoto, Tsutsumi, Masahiro, Suzuki, Shiro, Fujita, Koji, Nozaki, Taiki, Akita, Keiichi
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description 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 
doi_str_mv 10.1111/joa.13275
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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 &lt; 0.01), and that of the dorsoulnar (p = 0.021) and ulnopalmar (p &lt; 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. 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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 &lt; 0.01), and that of the dorsoulnar (p = 0.021) and ulnopalmar (p &lt; 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.</abstract><cop>England</cop><pub>Wiley Subscription Services, Inc</pub><pmid>32654121</pmid><doi>10.1111/joa.13275</doi><tpages>8</tpages><orcidid>https://orcid.org/0000-0002-3054-0273</orcidid><orcidid>https://orcid.org/0000-0003-1803-8202</orcidid><oa>free_for_read</oa></addata></record>
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source Wiley-Blackwell Read & Publish Collection; PubMed Central
subjects Aged
Aged, 80 and over
Bone imaging
Cadaver
Cadavers
Computed tomography
Cortical bone
dorsal
Female
Humans
ligament
Ligaments
Ligaments, Articular - anatomy & histology
Ligaments, Articular - diagnostic imaging
Magnetic Resonance Imaging
Male
Mechanical loading
Middle Aged
Morphology
Original Paper
Original Papers
palmar
radius
triangular fibrocartilage complex
Ulna
Ulna - anatomy & histology
Ulna - diagnostic imaging
wrist
Wrist Joint - anatomy & histology
Wrist Joint - diagnostic imaging
X-Ray Microtomography
title Anatomical relationship between the morphology of the styloid process of the ulna and the attachment of the radioulnar ligaments
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