Operatively Managed Transverse or Short Oblique B1 Periprosthetic Fractures Around a Polished Taper-Slip Femoral Stem Are Associated With Reoperation in One Third of Cases: A Retrospective Cohort Study
Bibliographic record
Abstract
Background: Transverse or short oblique periprosthetic femoral fractures around total hip arthroplasty (THA) stems are typically classified as B1 fractures (stem well-fixed) and usually managed with fixation. These fractures have high non-union rates. This study aimed to identify reoperation rates in patients with operatively managed transverse or short oblique fractures around a cemented polished taper-slip stem and determine any associations with treatment failure. Methods: This retrospective cohort study included 31 patients with Arbeitsgemeinschaft für Osteosynthesefragen transverse or short oblique Vancouver B1 periprosthetic femoral fractures around THA with a cemented taper slip stem: 12 males (39%); mean age 74 ± 11.9 years (range 44-91); mean BMI 28.5 ± 1.4 (range 16-48); median American Society of Anesthesiologists score 3. Patient journeys were assessed and re-interventions recorded. The primary outcome was reoperation. Results: = .584), most commonly within 2 years of injury (9/10) due to non-union (6/10). No significant associations with reoperation requirement were identified. Kaplan-Meier survival free from reoperation was 67.4% (95% CI 49.8-85.0) at 2 years, unaffected by initial management with fixation or revision (Log rank 0.898). Of those reoperated, 60% (6/10) required multiple reoperations to achieve bony union or a stable revision construct. Conclusions: These fractures are challenging to manage with either fixation or revision. Patients should be counseled about a one in 3 risk of reoperation and a one in 5 risk of requiring multiple reoperations.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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".