Journal Article
Ligament pre-tension determines outcome in sacroiliac joint in silicon modelling
Mark Heyland; Hendrik Schmidt; Friederike Schömig; Daven Maikath; Dominik Deppe; Matthias Pumberger; Georg N. Duda; Katharina Ziegeler; Philipp Damm
Medical & Biological Engineering & Computing · Vol. 63, Issue 11 · pp. 3321-3333 · 2025
Abstract
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. Graphical abstract Sacro-iliac joint models are determined by ligament laxity: stiffness & pretension. Our analyses show the relative effect of parameter assumptions on modeling results. A substantial preload or pretension changes joint stability / mobility and stress. The influence of ligament pre-tension on stress and relative joint mobility of the sacro-iliac joint was larger than load intensity (bodyweight of patient) in our modelling set-up. Evaluation of the specific ligament pretension is imperative for patient-specific finite element models.