Fig. 1

HR-pQCT and finite element analysis. (Left) Psoriatic arthritis (PsA) patient without disease-modifying anti-rheumatic drugs (DMARDs); (right) PsA patient under biological DMARD treatment. Both patients had the same age and sex. a, b Axial view of three-dimensional reconstruction of the cortical bone. c, d Axial view of the trabecular bone. e, f Axial view of finite element analysis-derived stress distribution (full μFEA models). g, h Coronal view of finite element analysis-derived stress distribution. Colors in e–h depict von Mises stress (MPa) for the described loading scenario