(Press-News.org) BMO in the sacroiliac joint on MRI is present in up to 84% of people with non-radiographic axSpA – but it is also often seen in a non-inflammatory setting, such as in women after childbirth.1,2 As back pain is common after childbirth, differential diagnosis with axSpA is an important issue in clinical practice.1 In axSpA, active inflammatory lesions are likely to progress to structural lesions over time – particularly fat lesions and erosions. But it is not known whether the same is true for BMO induced by mechanical stress. In June 2024, EULAR – The European Alliance of Associations for Rheumatology – held its annual congress in Vienna, Austria. In a clinical abstract session on imaging aspects of spondyloarthritis, new data were presented on the long-term evolution of postpartum BMO, and the potential development of structural lesions.
The researchers used follow-up data from a prospective study examining sacroiliac MRI lesions in healthy women following an uncomplicated vaginal delivery.1 Just over half of the original 35 participants underwent a new MRI of the sacroiliac joint approximately 5 years after initial inclusion. Structural and inflammatory lesions were assessed using a method similar to the Spondyloarthritis Research Consortium of Canada (SPARCC) scoring system. Baseline images were re-evaluated together with the 5-year follow-up data.
Overall, low numbers of fat lesions, erosions, and sclerosis were observed at both baseline and in the 5-year MRI images, whereas no ankylosis was accounted for. Fat metaplasia and erosions did not change significantly between baseline and 5-year follow-up. Sclerosis increased in only 3 of the 19 participants, all of whom had BMO after delivery. As expected, there was a significant decrease in BMO from baseline, although 32% of women still had BMO at the 5-year follow-up – half of whom met the ASAS definition of sacroiliitis. Having another delivery during the follow-up period did not seem to affect the presence of BMO at follow-up.
These results show that there is no significant development of structural MRI lesions in women 5 years after delivery – but BMO remained prevalent. This supports the hypothesis that transient mechanical stress-induced sacroiliac BMO on MRI does not seem to evolve into structural lesions – at least over the first 5 years.
Source
De Meester L, et al. Sacroiliac bone marrow oedema on postpartum MRI does not develop into structural lesions over a 5-year follow-up period. Presented at EULAR 2024; OP0222.
Ann Rheum Dis 2024; DOI: 10.1136/annrheumdis-2024-eular.6091.
References
1. Renson T, et al. High prevalence of spondyloarthritis-like MRI lesions in postpartum women: a prospective analysis in relation to maternal, child and birth characteristics. Ann Rheum Dis 2020;79(7):929–34.
2. Weber U, et al. Candidate lesion-based criteria for defining a positive sacroiliac joint MRI in two cohorts of patients with axial spondyloarthritis. Ann Rheum Dis 2015;74:1976–82.
About EULAR
EULAR is the European umbrella organisation representing scientific societies, health professional associations and organisations for people with rheumatic and musculoskeletal diseases (RMDs). EULAR aims to reduce the impact of RMDs on individuals and society, as well as improve RMD treatments, prevention, and rehabilitation. To this end, EULAR fosters excellence in rheumatology education and research, promotes the translation of research advances into daily care, and advocates for the recognition of the needs of those living with RMDs by EU institutions.
Contact
EULAR Communications, communications@eular.org
Notes to Editors
EULAR Recommendations
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END
Does BMO induced by mechanical stress progress to structural lesions?
Exploring MRI imaging findings in postpartum women
2024-06-14
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[Press-News.org] Does BMO induced by mechanical stress progress to structural lesions?Exploring MRI imaging findings in postpartum women