Bibliographic record
Abstract
In Brief Study Design. Pedicle screw fixation (PSF) has been used for the setting of a lumbar interbody fusion. Objective. To investigate analytically the effects of additional PSF to the anterior lumbar interbody fusion (ALIF) with the cylindrical cages (Ray TFC) in the immediate postoperative state. Summary of Background Data. An addition of PSF to the stand-alone ALIF increases segmental stiffness. Methods. A finite element model of ALIF (L4,–L5) was constructed. Finite element analyses were performed to investigate relative motion and bone stress at the bone-cage interface. The results were then compared with those of the stand-alone ALIF. Bone stress surrounding pedicle screws was also predicted. Results. An addition of PSF to the stand-alone ALIF led to higher segmental stiffness, smaller relative motion, smaller bone deformation, and lower bone stress level at the cage-bone interface. The bone stress level at the interface reduced substantially during extension. The bone stress level at the bone-screw tip interface was much lower than that of the bone-cage interface. The articulating facet had no significant load-bearing capacity because of stiff PSF. Little gap opening at the bone-cage interface was found during a compressive preload over 400 N; an excessive extension without preload caused considerable gap opening. Slip less than 0.15 mm occurred during all the loading modes except axial rotation; an excessive axial rotation caused to slip over 0.15 mm. Conclusion. Geometric constraints caused by PSF will reduce substantially the bone stress level and the relative motion, and therefore be more likely to allow bone ingrowth at the bone-cage interface, compared with the stand-alone ALIF. The use of pedicle screw stabilization would have significant beneficial effects on the rate of interbody fusion, regardless of whether ALIF or PLIF was used. Addition of pedicle screw fixation to stand-alone anterior lumbar interbody fusion with cylindrical cages led to higher segmental stiffness, smaller relative micromotion, smaller bone deformation, and lower bone stress in the cage/bone interfaces, compared with the stand-alone anterior lumbar interbody fusion. The articulating facet must have no significant load-bearing capacity because of stiff pedicle screw fixation.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.007 | 0.002 |
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".