Total knee arthroplasty in carefully selected patients aged 80 years or older
Bibliographic record
Abstract
BACKGROUND: The patients aged ≥ 80 years have been considered to have a higher risk of mortality, postoperative complications, and longer hospital stay following total knee arthroplasty (TKA) than younger patients. The purposes of this retrospective study were to review the results of TKA in patients aged ≥ 80 years after a preoperative consultation. METHODS: Seventy-five patients aged ≥ 80 years underwent TKA from January 2006 and June 2010. A control group of younger patients (65-74 years) was matched in a 1:1 ratio with the ≥ 80 years group for sex, diagnosis of the disease, body mass index, the American Society of Anesthesiologists' type of anesthesia, and comorbidities. Cardiologists and neurologists carefully evaluated the risk of patients for both groups before surgery. The groups were compared with regard to Knee Society Scores, Knee Society Function Score, Western Ontario and McMaster Universities Osteoarthritis Index scores, length of stay, postoperative complications, and 90-day mortality rate. RESULTS: The mean follow-up was 2.3 years (range 1-5 years). We found no difference in the functional outcomes and length of stay between the two groups. The ≥ 80 years group had a higher rate of blood transfusion (29.3% versus 10.7%, p = 0.006) after Bonferroni correction. There were no cardiovascular or cerebrovascular complications in the ≥ 80 years group. There were no mortalities within 90 days in either group. CONCLUSIONS: Despite similar functional results and pain relief of the TKA compared with the young patient group, the ≥ 80 years group had a higher complication rate of blood transfusion. With a preoperative consultation by cardiologists and neurologists, patients aged ≥ 80 years have a low cardiovascular or cerebrovascular complications and 90-day mortality after TKA.
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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 | 0.004 | 0.006 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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".