Bartz B, Tillmann B, Schleicher A
Anat Embryol (Berl). 1984;169(3):309-18. doi: 10.1007/BF00315636.
The proximal radio-ulnar joint has two different types of articular surfaces. The contact area between the articulating surfaces is at its greatest when the joint is in a middle position. The highest density of osseous material is found on the ulnar side of the head of the radius. The subchondral bone beneath the radial notch of the ulna has a higher density at the edges than in the middle. In photoelastic experiments the intensity and configuration of isochromatics correspond to the material density of the osseous tissue of ulna and radius. The analysis of spongiosa near the joint shows bands of compressive cancellous trabeculae radiating axially into the subchondral cortex, crossed at right angles by bands of tensile cancellous trabeculae. These findings are in agreement with the course of the trajectories found in photoelastic experiments. The composition of the annular ligament is variable. The palmar and dorsal parts are made up of firm connective tissue; opposite the radial notch of the ulna, however, cartilage cells are embedded in the ligament. The histological composition of the annular ligament and the cancellous architecture in the radius and the ulna are in agreement with Pauwels' (1963) hypothesis that part of the compressive force in the elbow joint is transferred to the proximal radio-ulnar joint via the annular ligament. The distribution of the material in the subchondral bony tissue indicates that there is only partial contact between the radial head circumference and the radial notch of the ulna in all positions of the joint.
近端桡尺关节有两种不同类型的关节面。关节处于中间位置时，关节面之间的接触面积最大。桡骨头尺侧的骨质密度最高。尺骨桡切迹下方的软骨下骨边缘密度高于中间部分。在光弹性实验中，等色线的强度和形态与尺骨和桡骨骨组织的材料密度相对应。对关节附近松质骨的分析显示，压缩性松质骨小梁带轴向辐射进入软骨下皮质，并与拉伸性松质骨小梁带成直角交叉。这些发现与光弹性实验中发现的轨迹走向一致。环状韧带的组成是可变的。掌侧和背侧部分由致密结缔组织构成；然而，在尺骨桡切迹相对处，韧带中嵌入了软骨细胞。环状韧带的组织学组成以及桡骨和尺骨的松质结构与 Pauwels（1963 年）的假设一致，即肘关节中的部分压缩力通过环状韧带传递至近端桡尺关节。软骨下骨组织中物质的分布表明，在关节的所有位置，桡骨头圆周与尺骨桡切迹之间仅存在部分接触。
