Spondyloarthritis & psoriatic arthritis
Evolution of Magnetic Resonance Imaging Lesions at the Sacroiliac Joints During and After Pregnancy by Serial Magnetic Resonance Imaging From Gestational Week Twenty to Twelve Months Postpartum
Authors' conclusion
At 12 months postpartum, 41% of women met the current ASAS sacroiliitis definition, which may result in false-positive assignments of axial SpA diagnosis in postpartum women with back pain. The topographical BME distribution and virtually absent erosions (ASAS threshold) at 12 months postpartum may help discriminate postpartum strain-related conditions from axial SpA-related sacroiliitis.
Study context
- Population
- First-time mothers, pregnant and postpartum
- Participants
- 103 first-time mothers
- Outcome
- Prevalence, evolution and topography of SI joint MRI lesions (BME, ASAS sacroiliitis, structural lesions; SPARCC and novel 2-plane method)
Methodological detailsserial magnetic resonance imaging (MRI) (up to 5) from gestational week 20 to 12 months postpartum, 3 independent assessors after calibration
- Serial MRI (up to 5) from gestational week 20 to 12 months postpartum
- 3 independent assessors after calibration
Main finding
As reported in the abstract
Prevalence of SI joint MRI lesions
- Bone marrow edema (BME) at 3 months postpartum (peak), Spondyloarthritis Research Consortium of Canada (SPARCC)
- 69%
- BME at 3 months postpartum (peak), 2-plane method
- 80%
- BME at 12 months postpartum, SPARCC
- 54%
- BME at 12 months postpartum, 2-plane method
- 58%
- Current ASAS sacroiliitis definition met at 12 months postpartum
- 41%
- New ASAS MRI threshold for active sacroiliac (SI) joint lesions met at 12 months postpartum
- 21%
- New ASAS MRI threshold for structural SI joint lesions met at 12 months postpartum
- 14%
- SPARCC erosion score ≥3 (ASAS threshold) at 12 months postpartum
- 2.8%
Observational data: associations, not effects.
Original publication
Evolution of Magnetic Resonance Imaging Lesions at the Sacroiliac Joints During and After Pregnancy by Serial Magnetic Resonance Imaging From Gestational Week Twenty to Twelve Months Postpartum. Arthritis Rheumatol. Published 9 April 2023. doi:10.
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