Normal anatomy and variations of the lateral femoral cutaneous nerve in relation to the iliac crest: implications for anterior iliac crest bone grafts (726.10)
Bibliographic record
Abstract
Anterior iliac crest bone grafting (AICBG) remains the gold standard for reconstructive procedures in orthopedic and oral‐maxillofacial surgeries. It has been estimated that 10% of patients undergoing AICBG are at risk of injury to their lateral femoral cutaneous nerve (LFCN). Injury to this nerve can result in numbness, burning, itching or pain sensations over the lateral aspect of the thigh, known as meralgia paresthetica. The course of the LFCN within the greater pelvis cannot be seen with imaging technologies. The objective of this study is to elucidate the 3D course and variability of the LFCN as it emerges from the psoas major muscle to the anterior superior iliac spine (ASIS). Using 25 embalmed cadavers, the length and depth of the LFCN is measured from the ASIS to 7 cm posterior to the ASIS at 1 cm intervals. Preliminary results (n=10 sides) show these measurements are highly variable between cadavers and that there are three ways the nerve courses: convex, concave or straight course. The first three dimensional danger‐zone of the LFCN relative to the iliac crest will be established and incorporated onto a 3D illustration of the pelvic bone using Amira software. A predictive model will be determined to approximate the location of the LFCN with respect to age, sex, height, bone width, and ASIS‐ASIS distance. A better understanding of the course of the LFCN is important to minimize graft site morbidity.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 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) | 0.000 | 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".