Proximal Femoral Replacement or Revision Stem Hemiarthroplasty for Metastatic Disease of the Proximal Femur—Is There Any Notable Difference?
Bibliographic record
Abstract
BACKGROUND: The incidence of metastatic cancer continues to increase, becoming a prevalent condition in oncology orthopaedic practice. The proximal femur is the third most common site of skeletal metastases. Two possible options for endoprosthetic reconstruction of proximal femur metastasis include proximal femur resection and replacement with megaprosthesis and hemiarthroplasty with a long-cemented revision stem. METHODS: To facilitate better decision making, we conducted a retrospective study comparing these alternatives. This is a single-institution, retrospective, observational study. Patients with metastatic disease of proximal femur who had a reconstruction with either a proximal femoral replacement (group A, 27 patients) or reconstruction using a hemiarthroplasty with long revision cemented stem (group B, 31 patients) were included for analysis. RESULTS: Group A was associated with higher estimated blood loss than group B (1027.8 vs. 491.9 mL, P = 0.007). Group A was associated with higher surgical time (148.9 vs. 116.6 minutes, P = 0.04). More patients were associated with intense care unit transfer in group A (P = 0.04). Group B was associated with a shorter average time to full weight-bearing (6.2 vs. 11.5 weeks, P = 0.03). Group B was associated with shorter time to discharge (9.4 vs. 17.0 days, P = 0.04). Group A was associated with more postoperative complications (n = 5, 18.5% vs. n = 0, 0%), (P = 0.02). CONCLUSION: In patients with metastatic disease of the proximal femur, reconstruction with a long revision stem hemiarthroplasty was associated with better performance regarding surgical outcomes (estimated blood loss, surgical time, transfer to intensive care unit vs. regular floor). Furthermore, patients with hemiarthroplasties presented an association with shorter rehabilitation time and less complications.
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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 | 0.003 | 0.002 |
| 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 | 0.000 |
| 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".