Abstracts of the International Research Society on Spinal Deformities (IRSSD) Meeting 2018
Bibliographic record
Abstract
length discrepancy is the result of relative anterior lengthening or relative posterior shortening.Objective To define the discrepancy of the three-dimensional CT measured anterior-posterior length of the spinal column in idiopathic scoliosis versus controls.Methods IRB approval and patient consent was obtained.Consecutive series of high-resolution pre-operative CT scans of 80 moderate to severe AIS patients (Cobb angle: 46-109°) and scans of 30 non-scoliotic agematched controls were analyzed.The height of the anterior and posterior vertebral bodies and discs, as well as the height of the laminae, interlaminar spaces, spinous processes and interspinous spaces of the thoracic curve, and corresponding levels in controls, were measured semi-automatically in the true mid sagittal plane of each individual vertebra. Results and discussionsIn AIS, the anterior height of the vertebral bodies and discs of the thoracic curve was 3.6±2.8%longer as compared to the posterior height, 2.0±6.1% longer than the length along the laminae and 8.7±7.1% longer than the length along the spinous processes and differed from controls (controls: -2.7±2.4%,-7.4±5.2% and +0.7±7.8%;p<0.001), with the non-osseous structures contributing significantly more to the length discrepancies.In absolute lengths, the anterior side of the disc of the thoracic curve was higher in AIS (5.4±0.8 mm) than controls (4.8±1.0 mm; p<0.001), whereas the interspinous space was smaller in AIS (12.3±1.4 mm versus 14.0±1.6 mm; p<0.001) and the absolute lengths of the osseous parts differed not significantly between AIS and controls. Conclusions and significanceThe true three-dimensional anterior-posterior length discrepancy of the scoliotic thoracic curves occur through both anterior column lengthening as well as posterior column shortening, with the facet joints as the fulcrum.In moderate to severe AIS, the vertebral bodies contribute partly to the anterior-posterior length discrepancy accompanied by more significant and possibly secondary increased anterior intervertebral discs height.
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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 | 0.001 |
| 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".