OUTCOME OF OPEN REDUCTION AND INTERNAL FIXATION OF VANCOUVER TYPE B FRACTURES AROUND A CEMENTED TAPERED POLISHED STEM
Bibliographic record
Abstract
Vancouver B fractures around a cemented polished tapered stem (CTPS) are often treated with revision arthroplasty. Results of osteosynthesis in these fractures are poor as per current literature. However, the available literature does not distinguish between fractures around CTPS from those around other stems. The aim of our study was to assess the clinical and radiological outcome of open reduction and internal fixation in Vancouver B fractures around CTPS using a broad non-locking plate. Patients treated with osteosynthesis between January 1997 and July 2011 were retrospectively reviewed. All underwent direct reduction and stabilisation using cerclage wires before definitive fixation with a broad DCP. Bicortical screw fixation was obtained in the proximal and distal fragments. We defined failure of treatment as revision for any cause. 101 patients (42 men and 59 women, mean age 79) were included. 70 had minimum follow-up of 6 months. 63 of these went on to clinical and radiological union. Three developed infected non-union. 7 had failure of fixation. Lack of anatomical reduction was the commonest predictor of failure followed by inadequate proximal fragment fixation and infection. 14 patients dropped at least 1 mobility grade from their preoperative status. This is the largest series of a very specific group of periprosthetic fractures treated with osteosynthesis. Patients who develop these fractures are often frail and “high risk” for major revision surgery. We recommend osteosynthesis for patients with Vancouver B periprosthetic fractures around CTPS provided these fractures can be anatomically reduced and adequately fixed.
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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 | 0.002 |
| 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".