Musculotendinous Inflammation: The Defining Pathology of Polymyalgia Rheumatica?
Bibliographic record
Abstract
Despite being the most common inflammatory rheumatic disease of the elderly, and despite significant scientific breakthroughs in the related condition giant cell arteritis (GCA), the paradigm of polymyalgia rheumatica (PMR) has failed to progress beyond its earliest descriptions as a glucocorticoid-responsive syndrome of shoulder and pelvic girdle pain and stiffness. In the absence of a gold standard test, diagnosis is based on laboratory evidence of systemic inflammation and the exclusion of other relevant differentials. Ultrasound findings including subacromial bursitis, biceps tenosynovitis, and glenohumeral synovitis at the shoulders, and synovitis and trochanteric bursitis at the hips, improve the specificity of clinical classification criteria1. However, the precise pathology underpinning PMR remains unclear2. A mild synovitis with CD4+ T cell and macrophage infiltration characterizes arthroscopic biopsies taken from the glenohumeral joints of patients with PMR, while histopathologic studies of muscle have consistently revealed only minor immunologic abnormalities3,4. Such uncertainty surrounding disease pathophysiology has undoubtedly hindered therapeutic advances in PMR, with the majority of patients still condemned to longterm prednisolone treatment and its attendant glucocorticoid-related complications. Modern advances in our understanding of PMR as a distinct disease entity have come largely courtesy of imaging. McGonagle, et al first reported an anatomical difference in the distribution of inflammation in their magnetic resonance imaging (MRI) study contrasting the shoulders of PMR and rheumatoid arthritis (RA) patients5. Extracapsular soft tissue edema differentiated the PMR group from its RA counterpart, whereas bursitis, tenosynovitis, and joint effusion did not. A subsequent study by the same authors investigating MRI findings at the metacarpophalangeal joints in PMR and RA similarly documented comparable rates of synovitis, tenosynovitis, and even bone erosions, with a much greater degree of gadolinium-enhancement noted in the extracapsular soft tissues of patients with PMR6. More recently, … Address correspondence to Dr. C.E. Owen, Rheumatology Department, Austin Health, Repatriation Campus, Level 1, North Wing, 300 Waterdale Road, Heidelberg West, Victoria, Australia 3081. E-mail: claire.owen{at}austin.org.au
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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 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.000 | 0.003 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.003 | 0.002 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
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".