The Pseudo A <sub>LT</sub> Periprosthetic Fracture: It’s Really a B2
Bibliographic record
Abstract
Periprosthetic fracture of the proximal femur involving the lesser trochanter (the Vancouver type A(LT)) is an uncommon occurrence. As it is basically an avulsion fracture of the attachment of the iliopsoas, it does not destabilize the stem and can be treated nonsurgically. In contrast, there is a so-called type "new B2" periprosthetic fracture of the lesser trochanter, which includes a segment of the proximal medial femoral cortex. This is usually seen within 6 weeks of the index procedure, typically following insertion of a tapered, cementless stem within a demineralized femur. This may be due to an unrecognized intraoperative fracture that subsequently displaced under load, or it may occur soon after, during rehabilitation. It is important to distinguish this fracture from the type A(LT), because it is associated with destabilization of the stem and requires early reintervention. The principles of treatment depend on the timing of the fracture and the size of the medial fracture fragment. If recognized intraoperatively as a nonpropagated cortical crack, then extraction of the broach or stem followed by cerclage cable fixation and reinsertion of the stem is adequate in most cases, with protected weight bearing for 6 weeks. If diagnosed postoperatively, or if the fracture fragment is larger, then management with a stem that gains fixation distal to the fracture is required. This distinction between the pseudo type A(LT) and the type "new B2" is important to recognize if appropriate treatment is to be prescribed and a satisfactory outcome is to be assured.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.002 | 0.001 |
| Insufficient payload (model declined to judge) | 0.005 | 0.002 |
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".