Bibliographic record
Abstract
STUDY DESIGN: Case series. OBJECTIVE: To describe a novel kyphoplasty procedure that gives uniform bone expansion in treatment of vertebra with heterogeneous bone structure. SUMMARY OF BACKGROUND DATA: Balloon kyphoplasty is used to treat vertebral compression fractures by restoring vertebral height and correcting kyphosis before the injection of bone cement that stabilizes the fracture. In vertebra with heterogeneous bone structure, balloon expansion may be nonuniformly as a result of this heterogeneity and could result in inadequate fracture reduction. METHODS: In the first part of the procedure, the balloon remains partially in its introducer trocar to inflate only the distal segment of balloon in the stronger bone area that provides high mechanical resistance. This segmental inflation creates a cavity that will allow to initiate fracture reduction in the stronger bone area. In the second part of the procedure, the emerging segment is deflated and the balloon is advanced until it emerges completely from the introducer trocar, after which the balloon is inflated totally in the vertebral body. Seven vertebrae in 5 patients (mean age of 71.4 years) were managed with this procedure. Etiology of fractures included myeloma (2 patients, 4 vertebrae) and senile osteoporosis (3 patients, 3 vertebrae). Twenty-millimeter long kyphoplasty balloons were used in all vertebrae. Polyméthylmetacrylate bone cement was used to fill the cavities. Technical, anatomic and clinical parameters were used for evaluation of the procedure. RESULTS: No complications occurred on balloon inflation. Mean volume of cement injected was 5.8 mL (range, 5-6 mL). Mean maximal inflation pressure was 200 PSI (range, 150-300 PSI). One (14.8%) cement leak was observed at 1 vertebra. Mean restoration of maximal lost height was 42.8% (range, 25%-52.9%). Mean reduction in local kyphosis was 4.4 degrees (range, 0-10 degrees ). All 5 patients were pain free at 1 month post procedure. Morbidity and mortality were nil. CONCLUSION: The described procedure allows for uniform bone expansion and adequate fracture reduction in vertebrae with heterogeneous bone structure.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.002 | 0.001 |
| Insufficient payload (model declined to judge) | 0.008 | 0.001 |
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".