Bibliographic record
Abstract
To the Editor: Ben-David et al. (1) investigated the need for a continuous sciatic nerve block (CSI) in addition to a continuous femoral nerve block (CFI) for postoperative analgesia following total knee arthroplasty (TKA). Their experience suggests that approximately 80% of patients benefit from the addition of a CSI. Their study was motivated by concerns their surgeons had about the routine use of a CSI, namely a form of masked mischief (e.g., common peroneal nerve injury, compartment syndrome) (2). The authors responsibly remind us that there continues to be controversy regarding the need for a CSI following TKA and that, although their study and experience are suggestive of the need for a CSI (in addition to a CFI), larger randomized and blinded studies with standard postoperative rehabilitative regimens need to be done to confirm or refute their suspicions. Our surgeons expressed similar concerns to us in the mid-1990s. We also found production pressure (3) to be a significant factor that discouraged our use of dual continuous peripheral nerve blocks. We developed a technique whereby the terminal fibers of both the sciatic and the obturator nerves can be blocked by intraoperative deposition of local anesthetic in the fat pad behind the knee (4). We called the technique the ‘transcruciate knee block.” In a small group of patients we demonstrated the utility of the technique. Although the original description consists of a single injection, the technique can be modified by inserting and tunneling a catheter. The technique had two major advantages in our opinion. It helped eliminate production pressure. More importantly, it enhanced the analgesia provided by a CFI without blockade of the parent trunk of the sciatic nerve. We would predict the principle risks with the technique to be vascular injury and infection, although we feel these risks should be very low and manageable. We did not have an opportunity to continue investigating the utility of the transcruciate knee block because of career choices and the reorganization of services within our health region. However, we would encourage further investigation of the technique if avoidance of sciatic nerve blockade is desirable and the incremental benefit of blocking the sciatic and obturator nerve contributions to the knee joint is substantial. Scott A. Lang, MD Department of Anesthesia, University of Calgary, Calgary, Alberta, Canada M. E. Rooney, MD Department of Anesthesia, Victoria Hospital, Prince Albert, Saskatchewan, Canada
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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 | 0.002 | 0.014 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.002 | 0.002 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.008 | 0.011 |
| Insufficient payload (model declined to judge) | 0.004 | 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".