Heyland Mark, Schmidt Hendrik, Schömig Friederike, Maikath Daven, Deppe Dominik, Pumberger Matthias, Duda Georg N, Ziegeler Katharina, Damm Philipp
Julius Wolff Institute, Berlin Institute of Health at Charité - Universitätsmedizin Berlin, Berlin, Germany.
Centrum Für Muskuloskeletale Chirurgie (CMSC), Charité - Universitätsmedizin Berlin, Berlin, Germany.
Med Biol Eng Comput. 2025 Jun 17. doi: 10.1007/s11517-025-03396-w.
Biomechanical analyses of the sacroiliac joint (SIJ) are limited. We hypothesize that influence of ligament pre-tension on strain and relative joint movement is morphologically sex-specific and more pronounced than effects of body weight. Finite element models were developed from CTs of a larger cohort (N = 818) for typical male (TMJ) and typical female joint (TFJ) geometries. For different loading scenarios, stresses were higher in TFJ than TMJ for same pre-tension, only considering sex-specific morphology. Loading in antero-posterior direction caused highest stresses and relative movement. Ligament pre-tension was most sensitive with mean sensitivity factor (change output [%]/change input [%]): 71.04/33.64 for translation, 43.09/4.02 for rotation, 2.11/ - 8.97 for stress for TFJ/TMJ respectively. Mean sensitivity factor of ligament stiffness was - 1.14/ - 1.06 for translation, - 0.90/ - 0.89 for rotation and 0.17/0.13 for stress, while mean sensitivity of load intensity was 1.09/1.10 for translation, 0.91/0.88 for rotation and 0.54/0.58 for stress for TFJ/TMJ respectively. Relative motion was more sensitive to parameter variations than stress. The hypothesis was confirmed: influence of ligament pre-tension on stress but especially relative joint movement of SIJ is morphologically sex-specific and larger than body weight effects. As this may play a crucial role in pain development, ligament pre-tension must be verified in situ in the future.
骶髂关节（SIJ）的生物力学分析有限。我们假设韧带预张力对应变和相对关节运动的影响在形态学上具有性别特异性，且比体重的影响更显著。从更大队列（N = 818）的CT图像中开发出有限元模型，分别针对典型男性关节（TMJ）和典型女性关节（TFJ）的几何形状。对于不同的加载场景，仅考虑性别特异性形态时，相同预张力下TFJ中的应力高于TMJ。前后方向加载导致最高应力和相对运动。韧带预张力最为敏感，平均敏感系数（输出变化[％]/输入变化[％]）：TFJ/TMJ的平移分别为71.04/33.64，旋转分别为43.09/4.02，应力分别为2.11/ - 8.97。韧带刚度的平均敏感系数平移为 - 1.14/ - 1.06，旋转为 - 0.90/ - 0.89，应力为0.17/0.13，而载荷强度的平均敏感度TFJ/TMJ的平移分别为1.09/1.10，旋转分别为0.91/0.88，应力分别为0.54/0.58。相对运动对参数变化比应力更敏感。该假设得到证实：韧带预张力对SIJ应力的影响，尤其是对相对关节运动的影响在形态学上具有性别特异性，且大于体重的影响。由于这可能在疼痛发展中起关键作用，未来必须在原位验证韧带预张力。
