The Effect of Joint Space on Midterm Outcomes After Arthroscopic Hip Surgery for Femoroacetabular Impingement
Bibliographic record
Abstract
BACKGROUND: Excellent short-term results have been reported after hip arthroscopic surgery to address femoroacetabular impingement (FAI). Purpose/ HYPOTHESIS: The purpose of this study was to determine if patients with narrow joint spaces had inferior outcomes at a postoperative minimum of 5 years and if they had a higher conversion rate to total hip arthroplasty (THA). The hypothesis was that patients with ≤2-mm joint spaces would report inferior outcomes and that patients with >2-mm joint spaces would have improved survivorship (no conversion to THA). STUDY DESIGN: Cohort study; Level of evidence, 3. METHODS: Between March 2005 and January 2008, prospectively collected data were analyzed for patients older than 18 years of age undergoing hip arthroscopic surgery for FAI. Radiographic measurements of joint space were collected, and hips were grouped as having preserved (>2 mm) or limited (≤2 mm) joint space. Outcome measures included the Western Ontario and McMaster Universities Arthritis Index (WOMAC), modified Harris Hip Score (MHHS), Hip Outcome Score (HOS) for activities of daily living and sports, and Short Form-12 (SF-12). RESULTS: There were 559 patients included, 466 (83%) of whom were contacted. Fifty-four patients with limited joint spaces (86%) converted to THA, while only 63 patients with preserved joint spaces (16%) converted to THA. The mean survival time for patients with preserved joint spaces was 88 months (95% CI, 85-91 months), and the mean survival time for patients with limited joint spaces was 40.0 months (95% CI, 33.7-46.3 months) (P = .0001). Complete follow-up outcome data were available on 323 patients, none of whom had THA, with a mean follow-up of 73 months. The mean postoperative HOS for activities of daily living and sports were significantly better in patients with preserved joint spaces (82 vs. 62 [P = .012] and 77 vs. 47 [P = .003], respectively) compared with those with limited joint spaces at a mean of 73 months postoperatively (range, 60-97 months). CONCLUSION: Hip arthroscopic surgery for FAI resulted in significantly better outcomes and activity levels at minimum 5-year follow-up in patients with preserved joint spaces. Hips with limited joint spaces converted to THA earlier than did those with preserved joint spaces.
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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 | 0.009 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".