IL17A and exostosis: However radiographic characteristics were significantly altered (Table 3) with patients with detectable IL-17 having lower minimum JSW (median 0.2mm, interquartile range (IQR) 0–0.9 vs. median 1.0mm, IQR 0–2.0, p = 0.042), fewer osteophytes (61.5% vs. 94.7%, p = 0.001) and less sclerosis (46.2% vs. 83.3%, p = 0.005)