Prevention of Nerve Injury After Periacetabular Osteotomy
Bibliographic record
Abstract
BACKGROUND: The Bernese periacetabular osteotomy (PAO) is the preferred pelvic osteotomy in many centers treating symptomatic acetabular dysplasia in the young adult. Major nerve injury has been reported as a complication that can occur with this complex procedure, but the incidence and circumstances associated with such injury are not well known. QUESTIONS/PURPOSES: We asked: (1) What is the incidence of sciatic and femoral nerve injury after PAO; (2) what are the risk factors associated with such injury; and (3) what are the consequences of such injury including the degree of neurologic recovery? PATIENTS AND METHODS: We identified 1760 PAOs that were performed between 1991 and 2008 at five institutions. A major nerve injury was defined as a postoperative motor nerve palsy or sensory deficit present after surgery in the distribution of the femoral or sciatic nerves. Risk factors associated with nerve injury and the treatment and degree of neurologic recovery were reviewed from medical records. RESULTS: Thirty-six of the 1760 patients (2.1%) had a major nerve deficit of the sciatic or femoral nerve develop. We identified no patient or surgical risk factor associated with the occurrence of nerve injury. Seventeen of the 36 patients had complete recovery. The median time to recovery or plateau was 5.5 months (range, 2 days to 24 months). CONCLUSIONS: The incidence of sciatic and femoral nerve injury during PAO is less than previously reported. Full recovery can be expected in only ½ of the patients and more commonly with injuries of the femoral nerve. If direct nerve injury is suspected, we believe exploration may be warranted. LEVEL OF EVIDENCE: Level II, prognostic study. See the Guidelines for Authors for a complete description of levels of evidence.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 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 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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".