Adikrishna Arnold, Shin Young-Ho, Zulkarnain Rizki F, Hong Hanpyo, Sun Yucheng, Jeon In-Ho
Department of Orthopedic Surgery, Asan Medical Center, College of Medicine, University of Ulsan, Seoul, Korea.
J Anat. 2017 Nov;231(5):690-697. doi: 10.1111/joa.12672. Epub 2017 Aug 15.
The posteromedial quadrant of the radial head is known to be different from the other quadrants. However, the explanation of this unique anatomical feature remains elusive. Hence, this study was designed to address this unique anatomical variance using three-dimensional μCT (micro-computed tomography) analysis. Nine fresh cadaveric radial heads were scanned using μCT. Three-dimensional subchondral bone and cartilage models were rendered. Both models were separated into the four quadrants at both the periphery (rim) and the articulating dish (fovea): anteromedial (AM), posteromedial (PM), posterolateral (PL), and anterolateral (AL). Each quadrant was analyzed in terms of (1) subchondral bone porosity (SBP), (2) mean subchondral bone thickness (MSBT), and (3) mean cartilage thickness (MCT). There was a significant difference between the fovea and the rim in terms of its microarchitectural features. Although within the fovea, the PM quadrant did not differ significantly from the other quadrants, a significant difference was found within the rim. In terms of SBP, PM, AM, PL and AL were calculated as 33, 37, 36 and 35%, respectively. In terms of MSBT, PM, AM, PL and AL were calculated as 0.11, 0.10, 0.09, and 0.09 mm, respectively. In terms of MCT, PM, AM, PL and AL were calculated 1.09, 0.81, 0.84 and 0.83 mm, respectively. The PM corner of the radial head between the 8 and 9 o'clock positions, was beveled. This might explain why the PM quadrant of the rim differed significantly from the other quadrants in terms of its microarchitectural features.
桡骨头的后内侧象限与其他象限不同，这是已知的。然而，对这一独特解剖特征的解释仍然难以捉摸。因此，本研究旨在通过三维μCT（微计算机断层扫描）分析来探讨这一独特的解剖变异。使用μCT对九个新鲜尸体的桡骨头进行扫描，构建三维软骨下骨和软骨模型。两个模型在外围（边缘）和关节盘（中央凹）均被分为四个象限：前内侧（AM）、后内侧（PM）、后外侧（PL）和前外侧（AL）。对每个象限进行以下分析：（1）软骨下骨孔隙率（SBP）、（2）平均软骨下骨厚度（MSBT）和（3）平均软骨厚度（MCT）。中央凹和边缘在微观结构特征方面存在显著差异。尽管在中央凹内，PM象限与其他象限没有显著差异，但在边缘发现了显著差异。在SBP方面，PM、AM、PL和AL分别计算为33%、37%、36%和35%。在MSBT方面，PM、AM、PL和AL分别计算为0.11mm、0.10mm、0.09mm和0.09mm。在MCT方面，PM、AM、PL和AL分别计算为1.09mm、0.81mm、0.84mm和0.83mm。桡骨头8点至9点位置之间的PM角呈斜面。这可能解释了为什么边缘的PM象限在微观结构特征方面与其他象限存在显著差异。
