Role of Obesity on the Risk for Total Hip or Knee Arthroplasty
Bibliographic record
Abstract
We asked whether there was an association between obesity levels and subsequent THA or TKA using data from 54,406 THA and TKA patients entered into the Canadian Joint Replacement Registry. We compared these patients with a sample of the Canadian population using the Canadian Community Health Survey of 2006. We analyzed information from the Canadian Joint Replacement Registry to quantify the relative risk for THA or TKA in Canada for specific body mass index categories. In reference to the acceptable weight category of body mass index less than 25 kg/m2, the risk for TKA and THA was 3.20- and 1.92-fold higher, respectively, for overweight individuals (body mass index 25-29.9 kg/m2); 8.53- (TKA) and 3.42-fold (THA) higher for those in the obese Class I (body mass index 30-34.9 kg/m2) category; 18.73- (TKA) and 5.24-fold (THA) higher for those identified in obese Class II (body mass index 35-39.9 kg/m2); and 32.73- (TKA) and 8.56-fold (THA) higher for people in obese Class III group (body mass index > 40 kg/m2). Thus, our data support an association between obesity and subsequent THA and TKA.
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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 | 0.006 |
| 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 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| 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".