Effects of intra-articular hylan G-F 20 injections on clinical and biomechanical characteristics of the knee in osteoarthritis
Bibliographic record
Abstract
The objectives of this study were to investigate the effects of Hylan G-F 20 (Synvisc; Genzyme Biosurgery, Ridgefield, New Jersey, USA) injections on clinical and biomechanical gait characteristics of patients with knee osteoarthritis. The design was a before-after trial, set in the gait laboratory of the rehabilitation unit of a university hospital. Twelve patients participated with an average age (+/-SD) of 63.2+/-4.4 years, and Kellgren and Lawrence grade II or III knee osteoarthritis. The main outcome measures were the Western Ontario McMaster Universities Osteoarthritis Index, and time-distance, kinematic and kinetic parameters of gait. The intervention used was a single course of three bilateral intra-articular injections of 2 ml Hylan G-F 20. One week after the treatment, the pain subscore and total score of WOMAC decreased from 9.2+/-2.7 to 4.8+/-3.1 and from 42.1+/-15.2 to 37.9+/-13.5, respectively. There was improvement in sagittal plane excursions of the knee (from 40.2+/-8.1 to 43.3+/-8.5), in extensor and adductor moments (from 0.26+/-0.2 to 0.14+/-0.1 and from 0.45+/-0.1 to 0.41+/-0.1, respectively), and in scaled vertical forces (from 85.8+/-4.5 to 88.4+/-5.4). All these differences were statistically significant. In conclusion, intra-articular Hylan G-F 20 injections not only decrease pain in patients with knee osteoarthritis, but can alter the natural history of the disease by decreasing excessive loads in the knees.
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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 | 0.001 | 0.004 |
| 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) | 0.000 | 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".