“…Of the 48 patients who were reported PPsA after ustekinumab, 30 patients (62.5%) had new-onset arthralgia [ 57 , 60 , 62 , 65 – 67 , 72 , 75 , 78 ], while the other 18 patients (37.5%) had exacerbation of preexisting arthritis [ 57 , 62 , 63 , 67 , 74 , 77 ]. Most of the patients had peripheral arthritis (34/39, 87.2%) [ 57 , 60 , 62 , 63 , 66 , 67 , 74 , 75 , 77 ], followed by dactylitis (8/39, 20.5%) [ 60 , 62 , 63 , 75 ], enthesitis (8/39, 20.5%) [ 62 , 63 , 75 ], and spondylitis (5/39, 12.8%) [ 63 , 66 , 75 , 78 ]. The mean latency for the 44 cases that reported the exact time to arthritis onset was 11.42 ± 11.45 months (range 3 days to 4 years).…”