Isolated axial involvement exists in 2-5% of PsA patients. In 576 patients 495 (31.4%) had axial disease, of which 32 (2.0%) had isolated axial disease. HLA-B*27+ and lower HAQ scores were associated with isolated axial disease @RheumNow #ACR21 Abst#1775 https://t.co/Y1EAJlA0mT https://t.co/8oZhN3mT30