Early results of surgery for femoroacetabular impingement in patients with osteonecrosis of femoral head
Bibliographic record
Abstract
PURPOSE: Femoroacetabular impingement and its surgical treatment have not been described before in osteonecrosis of femoral head. We present here outcomes of 15 patients with femoroacetabular impingement secondary to osteonecrosis of femoral head. This results from partial collapse of femoral head, particularly in the anterosuperior region, secondary to osteonecrosis. With subsequent remodelling, periphery of the femoral head flattens and osteophytes form in this area. All these patients were managed with open/arthroscopic osteochondroplasty of femoral head. METHODS: These patients were symptomatic for hip impingement. Cam deformity was studied using computed tomography and magnetic resonance imaging. In six patients open osteochondroplasty was carried out using surgical hip dislocation. In nine patients arthroscopic femoral head osteochondroplasty was done. All the patients were followed up for hip pain (VAS), Harris hip score (HHS), Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC), and hip range of motion. RESULTS: A statistically significant improvement in the VAS for pain, HHS, and WOMAC score was noted. Average HHS improved from 71.3 (SD, 13) to 89.7 (SD, 14.5), p-value 0.0079. Average WOMAC improved from 73.6 (SD, 15.4) to 92.4 (SD, 16), p-value 0.0154. Impingement test became negative in all the patients. A significant improvement in hip ROM was noted. There was no conversion to total hip arthroplasty. All patients could sit on the floor cross-legged and squat. CONCLUSION: Some patients with partial collapse of femoral head due to osteonecrosis present chiefly with symptoms of femoroacetabular impingement. They should be identified as osteochondroplasty gives successful results in these patients. Level of evidence - IV.
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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) | 0.000 | 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 | 0.000 |
| 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 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".