Hidradenitis suppurativa is a chronic dermatosis, characterized by an inflammation of the follicular epithelium in the apocrine glands.

The hypothesis of a link between hidradenitis suppurativa and inflammatory rheumatism has been widely considered, with evidence in support of this theory accumulating from several case reports and small series. The most frequently cited rheumatismal disease thought to be associated with Hidradenitis suppurativa is spondyloarthritis.

Taken together, these data suggest that there may a link between hidradenitis suppurativa and spondyloarthritis, but literature data are sparse, and to date, no study has investigated or demonstrated such a relation. Indeed, existing studies to date were observational, descriptive, and retrospective, and did not use modern diagnostic approaches for documenting spondyloarthritis, such as magnetic resonance imaging (MRI) or the recent classification of spondyloarthritis.

The aim of the study was to test the hypothesis that the risk of spondyloarthritis is increased in patients with hidradenitis suppurativa.

Inclusion Criteria:

• for case: patients with diagnosis of hidrosadenitis suppurativa in the Department of Dermatology of the University Hospital of Reims, regardless of the stage of severity and duration of their disease
• for control: patients without diagnosis of hidrosadenitis suppurativa matched to cases for age (±5 years) and sex
• for case and control: have accepted to take part in the research

Exclusion Criteria:

• for case and control: age <18 years old