Long-term evolution of postpartum sacroiliac bone marrow oedema: a 5-year longitudinal follow-up study
Bibliographic record
Abstract
INTRODUCTION: Bone marrow oedema (BME) on MRI of the sacroiliac joints (SIJ) commonly occurs after pregnancy. Our goal was to assess the evolution of BME over a period of 5 years and the potential development of structural lesions. METHODS: MRI-SIJ was performed after an uncomplicated vaginal delivery, with a follow-up 5 years later, evaluating both inflammatory and structural lesions. RESULTS: 19 women were assessed. Mean age was 35.3 years, with median body mass index of 20.8. Six subjects reported back pain, of which only one reported inflammatory back pain (IBP). No association was found between IBP and Spondyloarthritis Research Consortium of Canada (SPARCC) score (p=0.24), nor with a positive MRI according to the Assessment of SpondyloArthritis international Society (ASAS) definition at baseline (p=0.64). Thirty-two percent (6/19) presented with BME after 5 years, 3 of whom met the ASAS definition of a positive MRI-SIJ, irrespective of subsequent pregnancies. A new delivery during follow-up was linked to the total number of structural lesions at year 5, whereas mean weight gain across all pregnancies correlated with sclerosis. Sclerosis and erosions were more frequently detected by synthetic CT compared with T1-weighted MRI. CONCLUSIONS: In postpartum women, no significant development of structural MRI lesions was observed 5 years after a single delivery, despite the presence of BME in a significant number of individuals postpartum and at follow-up. These results support the hypothesis that, unlike BME in SpA, childbirth-related mechanical stress-induced BME does not lead to structural lesions. However, subsequent pregnancies may contribute to their development.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".