Uncemented fully porous-coated long femoral stem prosthesis for management of Vancouver type B2 periprosthetic femoral fracture
Bibliographic record
Abstract
Objective To evaluate the clinical results of uncemented fully porous-coated long femoral stems in treating Vancouver type B2 periprosthetic femoral fracture following hip arthroplasty. Methods A retrospective analysis was made on 12 patients (12 hips) with Vancouver type B2 periprosthetic femoral fracture treated using the uncemented fully porous-coated long femoral stem prosthesis combined with cerclage fixation with steal-wire or titanium cable devices from February 2006 to January 2013. There were 5 males and 7 females, aged average 69.8 years (range, 62 to 79 years). The status of primary arthroplasty was uncemented bipolar hemiarthroplasty in 2 patients and total hip arthroplasty in 10 patients (2 cement and 8 cementless femoral stems). At the final follow-up, Harris hip score for clinical evaluation, Beals and Tower's criteria for radiological evaluation, and complications were recorded. Results There were no intra-operative complications such as femoral perforation and femoral fracture. All patients were followed up for mean 38 months (range, 24-72 months). At the last follow-up, mean Harris hip score was 87.2 points (range, 50 to 100 points). All fractures healed at average 16 weeks (range, 12-28 weeks). All the 12 hips showed prosthesis stability despite there was one femoral stem subsidence of 3 mm. One patient slipped and sustained another periprosthetic fracture (Vancouver type B1) at postoperative 4 months and was treated successfully with locking plate and cables. According to the Beals and Tower's criteria, there were 10 excellent, 1 good and 1 poor results. Final follow-up revealed no complications of deep vein thrombosis, dislocation and prosthesis loosening. Conclusion Uncemented fully porous-coated long femoral stems provide good primary stability that promotes fracture healing and offers a reasonable treatment of Vancouver B2 femoral periprosthetic fracture. Key words: Femoral neck fractures; Arthroplasty, replacement, hip; Periprosthetic fractures
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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) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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".