Costal Cartilage Autografts to Simulated Degenerative Intervertebral Discs in the Rat
Bibliographic record
Abstract
In Brief Study Design. An autograft of costal cartilage was transplanted into the rat intervertebral space in the proximal tail following 2 weeks of simulated degeneration by chondroitinase ABC (CABC). Objectives. The purpose of this study was to evaluate costal cartilage transplantation into a degenerated disc as a possible therapy. Summary of Background Data. Reversal of degenerative disc dehydration is an attractive goal. Costal cartilage is plentiful, hydrophilic, and avascular, leading us to speculate that it would survive transplantation into the degenerated disc, increase proteoglycan content, and restore disc height. Materials and Methods. Costal cartilage fragments were transplanted into a single proximal intervertebral disc in each of the rats’ tails following a 2-week period of simulated degeneration. The intervertebral space was measured on radiographs under 2.5× magnification taken pretreatment and 21 days posttreatment. Each specimen was sagittally sectioned, mounted, and stained. The slides were graded for proteoglycan content. Results. A 64% increase in intervertebral disc height was observed in the implant group compared with a 4% increase in sham operated group and a 39% increase in the CABC only group. Histology demonstrated a viable implant in 7 of 9 rats. The transplant group had significantly more proteoglycan staining than either the CABC group or sham group (P < 0.05). Conclusions. Costal cartilage transplantation may rehydrate degenerated intervertebral discs and might serve as a promising model for understanding and perhaps modifying this complex degenerative disease. This study evaluated costal cartilage transplantation into a degenerated disc. The transplanted group had a greater increase in intervertebral height as well as significantly more proteoglycan staining compared with controls. Costal cartilage transplantation might serve as a promising approach in the study of degenerative disc disease.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| 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".