You can expect to see more bony erosion and enthesiophyte growth in your patients with PsA than in those with isolated psoriasis.
Reference1. Simon D, Kleyer A, Faustini F, et al. Simultaneous quantification of bone erosions and enthesiophytes in the joints of patients with psoriasis or psoriatic arthritis - effects of age and disease duration. Arthritis Res Ther. 2018;20:203. doi: 10.1186/s13075-018-1691-z.