21 March 2026
: Case report 
Janus Kinase Inhibitor Upadacitinib in Elderly-Onset Rheumatoid Arthritis With Hip Osteoarthritis: A Case Report
Unusual or unexpected effect of treatment, Patient complains / malpractice, Unexpected drug reaction, Clinical situation which can not be reproduced for ethical reasons, Rare coexistence of disease or pathology
Yusuke Sanji ABCDEFG 1*, Isao Matsushita ADE 2, Eiji Takahashi A 1, Makoto Fukui A 1, Hironori Kitajima
A 1, Ayumi Kaneuji A 1
DOI: 10.12659/AJCR.950915
Am J Case Rep 2026; 27:e950915
Figure 3 Coronal computed tomography of the right hip 1 year after treatment initiationTypical osteoarthritis changes remained, including acetabular bone cysts and secondary acetabulum formation; however, a defined subchondral bone appearance was observed, which had not been identified on radiographs obtained before initiation of treatment at our institution.