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Psoriatic arthropathy
Reactive arthritis
Enteropathic arthropathy
Pustulotic arthro-osteitis
Juvenile arthropathy
Other forms of spondyloarthropathy

Other forms of spondyloarthropathy encompass

  • Psoriatic arthropathy
  • Reactive arthritis
  • Arthritis associated with inflammatory bowel disorders (enteropathic arthropathy)
  • Undifferentiated spondyloarthropathy

Additionally, special forms such as 

  • Pustulotic arthro-osteitis
  • Juvenile spondyloarthropathy


There is limited knowledge about radiographic changes. Findings by MRI have not been systematically analysed and can vary considerably depending on type, stage and activity of disease. In all non-AS forms of SpA changes to some degree similar to those of AS may occur, especially in patients with tissue type HLA B27. However, some features are characteristic of the other forms of SpA. This is particularly the case in psoriatic and reactive arthritis. Sacroiliitis in these disorders is often unilateral and the spinal changes can be characterised by more voluminous new bone formation (para-syndesmophytes) than seen in AS with signs of inflammation during active phases. In psoriatic arthropathy predominant osseous inflammation can be seen. This is particularly seen in changes associated with pustular psoriasis, which can be similar to those associated with the skin disease pustulosis palmoplantaris.


Psoriatic arthropathy is a chronic inflammatory rheumatic disease affecting patients with the dermal disease psoriasis. The joints of the extremities are most often involved, but approximately one third of the patients have inflammatory changes of the spine and/or the sacroiliac joints.


Reactive arthritis is usually a transient acute arthritis appearing a few weeks after an infection somewhere in the body, mostly located in the urinary or the gastrointestinal tracts. It usually involves large joints, such as knees and ankles as well as feet. There may be inflammatory changes located to the sacroiliac joints in the acute stage. The disease usually disappears after some months, but may recur and can develop into a chronic condition. This is especially the case in patients with the tissue type HLA B27. Patients with a chronic course often have involvement of the sacroiliac and/or spinal joints.


Arthritis associated with the inflammatory bowel disorders ulcerative colitis and Crohn’s disease is usually named enteropathic arthropathy. This arthropathy is seen in 10-15% of patients with these bowel disorders and can involve peripheral joints as well as the sacroiliac joint and the spine.


Patients with clinical signs of inflammation at the sacroiliac or spinal joints without other signs making it possible to establish one of the above mentioned rheumatic diagnoses are usually grouped under the name undifferentiated spondyloarthropathy. Psoriasis, typical imaging signs of AS or other SpA manifestations may occur later and contribute to a classification in one of the well defined forms of SpA.


There are less frequent forms of spondyloarthropathy, e.g. arthropathy associated with the dermal disease pustulosis palmoplantaris, often referred to as pustulotic arthro-osteitis. Involvement of the sacroiliac and/or the spinal joints as part of juvenile arthritis - juvenile spondyloarthropathy - may also occur. These rheumatic disorders can be separated from the more common types by clinical and/or imaging findings.

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