Toyohara Ryota, Hammer Niels, Ohashi Toshiro
Faculty of Engineering, Hokkaido University, Sapporo, Japan.
Division of Clinical and Macroscopic Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Graz, Austria.
Biomed Mater Eng. 2024;35(1):53-63. doi: 10.3233/BME-230041.
The human sacroiliac joint (SIJ) in vivo is exposed to compressive and shearing stress environment, given the joint lines are almost parallel to the direction of gravity. The SIJ supports efficient bipedal walking. Unexpected or unphysiological, repeated impacts are believed to cause joint misalignment and result in SIJ pain. In the anterior compartment of the SIJ being synovial, the articular surface presents fine irregularities, potentially restricting the motion of the joints.
To clarify how the SIJ articular surface affects the resistance of the motion under physiological loading.
SIJ surface models were created based on computed tomography data of three patients and subsequently 3D printed. Shear resistance was measured in four directions and three combined positions using a customized setup. In addition, repositionability of SIJs was investigated by unloading a shear force.
Shear resistance of the SIJ was the highest in the inferior direction. It changed depending on the direction of the shear and the alignment position of the articular surface.
SIJ articular surface morphology is likely designed to accommodate upright bipedal walking. Joint misalignment may in consequence increase the risk of subluxation.
由于人体骶髂关节（SIJ）的关节线几乎与重力方向平行，因此在体内会受到压缩和剪切应力环境的影响。骶髂关节支持高效的双足行走。意外或非生理性的反复冲击被认为会导致关节错位并引起骶髂关节疼痛。在骶髂关节的前侧间室为滑膜组织，其关节面存在细微不规则之处，这可能会限制关节的运动。
阐明骶髂关节面在生理负荷下如何影响运动阻力。
基于三名患者的计算机断层扫描数据创建骶髂关节表面模型，随后进行3D打印。使用定制装置在四个方向和三个组合位置测量剪切阻力。此外，通过卸载剪切力来研究骶髂关节的复位能力。
骶髂关节的剪切阻力在下方方向最高。它会根据剪切方向和关节面的对齐位置而变化。
骶髂关节面形态可能是为适应直立双足行走而设计的。关节错位可能会增加半脱位的风险。
