Axial Psoriatic Arthritis and Ankylosing Spondylitis with Psoriasis A cohort analysis from Toronto suggests that axial psoriatic arthritis (PsA) is distinctly different from axial ankylosing spondylitis (AS) with psoriasis. https://t.co/8bAoqp79Mg https://t.co/K2Z1LwPTiS