Treatment of Vancouver B3 Periprosthetic Femur Fractures With a Fluted Tapered Stem
Bibliographic record
Abstract
Periprosthetic femur fractures around a hip arthroplasty associated with a loose stem and severely deficient or comminuted bone typically have been treated with substitution for the proximal femur using an allograft prosthetic composite or a tumor prosthesis. Eight patients (mean age, 68 years; range, 34-80 years) with Vancouver Type B3 femur fractures were treated with revision using a long modular fluted tapered uncemented stem with retention of the proximal femur. Access to the failed prosthesis and joint was gained through the fracture or osteotomy and soft tissue attachments to the fracture fragments were maintained. One patient died within 1 week. The remaining patients were followed up 1 to 2 years (mean, 1.5 years). At final followup, all patients had stable implants and all acute fractures were healed. Marked reconstitution of proximal femoral bone stock was observed consistently. All surviving patients were ambulatory and none had more than mild pain. The preliminary results of this method show a high rate of stable implant fixation and fracture healing with preservation and reconstitution of the host femur.
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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 | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".