Tools to screen for spondyloarthritis (SpA) among people with the extra-musculoskeletal conditions that commonly co-occur with SpA — psoriasis, uveitis, and inflammatory bowel disease (IBD) — show potential for their use in target populations but have limited generalizability for patients at risk for SpA, according to findings from a scoping review of 18 tools.
Prior to the review comparing available tools, first author Vartika Kesarwani, MBBS, of the University of Connecticut, Farmington, and colleagues wrote that the performance of SpA screening tools in dermatology, ophthalmology, and gastroenterology contexts had not been evaluated.
“Given the evolving landscape of therapeutics for spondyloarthritis, recognizing the full spectrum of disease manifestations in individual patients becomes increasingly important. This knowledge can inform treatment decisions, potentially altering the course of the disease,” corresponding author Joerg Ermann, MD, of Brigham and Women’s Hospital, Boston, said in an interview.
In the study, published on February 1 in Arthritis Care & Research, the investigators identified 13 SpA screening tools for psoriasis (screening specifically for psoriatic arthritis), two for uveitis, and three for IBD. All tools with the exception of one for uveitis were patient-oriented questionnaires with an average completion time of less than 5 minutes.
Overall, the researchers found significant variability in the nature of the questions used to identify clinical features of SpA; 15 tools included at least one question on back pain or stiffness; 16 tools had at least one question on joint pain, swelling, or inflammation; 10 included questions about heel or elbow pain; and 10 included questions about swelling of digits.
All 13 of the psoriasis tools were screened for peripheral arthritis, while 10 screened for axial involvement, eight screened for enthesitis, and eight screened for dactylitis.
All three of the IBD tools were screened for axial involvement and peripheral arthritis, and two were screened for enthesitis and dactylitis.
Both of the uveitis tools were screened for axial involvement, but neither was screened for peripheral arthritis, enthesitis, or dactylitis.
Sensitivities in the primary validation groups were similar for the 16 tools for which sensitivities were reported, ranging mainly from 82% to 92% for 11 psoriasis tools, 91% to 96% for uveitis tools, and 83% to 93% for IBD tools.
Specificities for psoriasis tools ranged from 69% to 83% for all but two of the tools, which was 46% for one and 35%-89% for another across three geographical cohorts. For uveitis tools, specificities were 91%-97% for uveitis tools, and for IBD tools, 77%-90%. Most of the secondary validations involved psoriasis tools, and these were generally lower and also more variable.
The Case for a Generic Tool
The relatively few SpA tools for patients with uveitis and IBD, compared with psoriasis, may be attributable to a lack of awareness of the association between these conditions on the part of ophthalmologists and gastroenterologists, the researchers wrote in their discussion. Therefore, a generic SpA screening tool that could apply to any extra-articular manifestation might increase screening across clinical settings and streamline rheumatology referrals, they noted.
The review’s findings were limited by several factors, including the inclusion of only articles in English and the relatively few tools for uveitis and IBD patients, the researchers noted.
The findings suggested that although the performances of the tools are similar, their degree of variability supports the value of a generic tool, they concluded.