Presence of Markers of Femoroacetabular Impingement in the Asymptomatic Population
Bibliographic record
Abstract
Purpose To determine: 1) the prevalence of femoroacetabular impingement (FAI) in asymptomatic individuals, and 2) whether there is an association between the presence of FAI and age and degenerative disease. Methods: 88 volunteers were verified as asymptomatic through physical examination and then underwent an MRI of the hip. Different criteria values were used to classify the presence or absence of cam (alpha angle of 45, 50 and 55 degrees) and pincer (centre‐edge (CE) angle of 35 and 40 degrees) impingement. Results The prevalence of FAI ranged from 23.9 to 67.0% depending on the classification criteria applied. There was no significant association between FAI and age. Prevalence of FAI, identified using high criteria values (55 degree alpha angle and 40 degree CE angle), predicts the presence of acetabular cartilage lesions. Prevalence of FAI, identified using lower criteria values, was not a significant predictor of degenerative disease. Conclusion FAI is prevalent in the asymptomatic population. Further research is necessary to verify the validity and reliability of criteria used to diagnose impingement and to determine the validity of the diagnosis. Support: AANA and SIRF. Grant Funding Source Internal
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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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".