Prognostic Significance of Magnetic Resonance Imaging Changes of the Sacroiliac Joints in Spondyloarthritis – A Followup Study
Bibliographic record
Abstract
OBJECTIVE: To evaluate the prognostic significance of sacroiliac joint (SIJ) changes by magnetic resonance imaging (MRI) based on 2-7 years of followup of patients with axial spondyloarthritis (SpA). METHODS: Ninety-four patients (50 women, 44 men) with axial SpA obtained MRI of the SIJ from 1998-2004. They were examined at followup after 25-95 months (mean 51), including MRI and radiography of the SIJ and the spine. The Danish scoring method was used to quantify the activity and chronic SIJ changes by MRI. The activity score included subchondral edema and/or enhancement, while chronic changes encompassed erosions and subchondral fatty marrow deposition (FMD). RESULTS: The MR score values for chronic SIJ changes increased significantly during followup, and were most pronounced in HLA-B27-positive patients and patients fulfilling the modified New York criteria for ankylosing spondylitis (AS) at followup. SIJ activity scores >or= 2, total chronic scores >or= 1, erosion scores >or= 1, and FMD scores >or= 4 at baseline were significantly related to progression of chronic SIJ changes. Activity score values >or= 3 at baseline had a sensitivity of 0.83, specificity of 0.75, and accuracy of 0.80 in relation to the presence of AS at followup. The similar values for total chronic SIJ scores >or= 4 at baseline were 0.86, 0.75, and 0.82, respectively, and for erosion scores >or= 2 they were 0.88, 0.75, and 0.83. CONCLUSION: The occurrence of manifest SIJ activity by MRI or chronic changes at baseline was related to progression of chronic changes and the presence of AS at followup.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.004 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| 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 source (direct Gemma or distilled Codex), 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".