Pediatric Trigger Thumb in Identical Twins: Congenital or Acquired?
Bibliographic record
Abstract
Pediatric trigger thumb is an uncommon condition with a calculated incidence of 3 per 1000 live births or less. Some reports have suggested a congenital etiology while others could not find a single case of pediatric trigger thumb at birth. This article reports the occurrence of bilateral trigger thumbs in identical twins, age 3 years and 9 months, affecting their thumbs to similar extents, which may suggest a congenital etiology.Congenital etiology for trigger thumb has been proposed for many reasons: occurrence in infants, occurrence in twins, occasional bilaterality, possible presence of triggering at birth, and absence of history of trauma. The occurrence of pediatric trigger thumb in twins has been reported 3 times in the literature; all reported cases were bilateral, as in our case.The mean age at presentation of pediatric trigger thumb is 2 years. The thumb is usually held in a fixed flexion position (mimicking a fracture). Examination usually reveals a palpable nodule in the flexor pollicis longus tendon at the metacarpal joint. This is an important clinical sign. Triggering in children, however, is rare. Macroscopically, there is a nodular thickening of the tendon itself. Pathological changes can be found in the tendon, tendon sheath, or both. A specimen taken from one of the nodules in our case showed degenerative changes while those from both pulleys were normal.Pediatric trigger thumb responds predictably to A1 pulley release, preferably before age 4 years, although milder cases may resolve spontaneously.
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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 | 0.000 | 0.005 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.002 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 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".