Tratamiento de las fracturas periprotésicas de fémur Vancouver B2 y B3
Bibliographic record
Abstract
BackgroundPeriprosthetic fractures of the femur are becoming more prevalent. When this fracture occurs in a loose stem (B2) or with bone loss (B3), the treatment is femoral stem revision.MethodsWe analyzed retrospectively 22 patients, 9 with type B2 fractures and 13 with type B3 fractures of the Vancouver classification. Follow-up averaged 48 months. We used cemented long stems, with impacted bone allograft, strut allograft, uncemented long stems (with distal fixation) and unconventional endoprosthesis according to the case.ResultsAll fractures healed and remodeled. The complications were 2 (9%) dislocations, 1 (4.5%) infection, 1 (4.5%) calcar fracture, 1 (4.5%) loosening of cemented acetabular component and 2 (9%) deaths.Conclusions The periprosthetic femoral fractures B2 and B3 require replacement of the femoral stem, while there is a trend to use uncemented stems; in this series due to the overlap of treatments according to each subtype of fracture, there were no differences between the use of cemented stems with allograft or uncemented stem. In cases of severe bone loss the unconventional endoprosthesis offer a treatment option for patients with low functional demand. The Vancouver classification is a useful tool to guide the surgeon on the treatment.
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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 | 0.000 | 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 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 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 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".