Medium-term outcomes of uncemented total hip arthroplasty in patients younger than 25 years old: A retrospective research
Bibliographic record
Abstract
Abstract Objective: To evaluate the medium-term outcomes of uncemented total hip arthroplasty in patients ≤ 25 years. Methods: A retrospective research was performed on patients ≤ 25 who received uncemented total hip arthroplasty at the Department of Orthopedics of the 940th Hospital of Joint Logistic Support Force of Chinese People’s Liberation Army from January 2009 to December 2018. The clinical evaluation was measured with modified Harris Hip Score, Western Ontario & McMaster Universities Osteoarthritis Index, and Short-Form 36. Postoperative complications (such as infection, revision, dislocation, and incisional healing issues) were recorded. Using pelvic anteroposterior, hip anteroposterior and lateral X-rays, the radiographic outcome was evaluated, including the position of the implants, loosening, bearing-surface wear, osteolysis, and heterotopic ossification. Loosening of the acetabular or femoral component or revision for any reason was defined as failure. Results: At a follow-up of 8.3±2.4 years (range, 3.8 to 12 years), the preoperative modified Harris hip score was 43.5±12.9 (range, 18 to 62) and increased to 88.3 ± 8.8 (range, 72 to 97), and the preoperative postoperative Western Ontario & McMaster Universities Osteoarthritis Index score improved from 43.6±8.4 (range, 33.1 to 62.3) to 11.5 ± 6.8 (range, 2.5 to 25.8). The Physical Component score-SF-36 improved from 48.5 ± 8.6 (range, 36.4 to 61.3) to 81.2 ± 10.3 (range, 60.3 to 97.5), while the Mental Component score-SF-36 increased from 56.6±12.5 (range, 39.4 to 78.6) to 82.6 ± 12.9 (range, 54.7 to 97). The latest X-ray revealed that the position of the implants did not change substantially since the postoperative image. The abduction angle of acetabular cup was 41.8° ± 6.7° (range, 31° to 57°),the anteversion angle of acetabular cup was 18.2° ± 3.6° (range, 9.5° to 25.7°), and the filling ratio was 90.1% ± 3% (range, 85.2%-95.3%). The preoperative leg length discrepancy was 1.8 cm ± 0.8 cm (range, 1 cm to 5 cm) and reduced to 1.4 cm ± 0.5 cm (range, 0.5 cm to 2.5 cm). No considerable loosening, bearing-surface wear, osteolysis, or heterotopic ossification was observed. At the latest follow-up, the overall survival rate of the 49 hips was 98%. Conclusion: For patients with end-stage hip disease under 25 years old, uncemented THA exhibit excellent outcomes, with a high survival rate and fewer complications at medium-term follow-up.
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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 | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 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) | 0.001 | 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".