Perioperative medicine & outcomes
Development and Clinical Utility of Machine Learning Models for Prediction of Same‐Day Discharge in Outpatient Hip and Knee Replacement: A Prognostic Study
Authors' conclusion
Machine learning based prognostic probability scores for planning same-day hip and knee replacement in pre-selected eligible patients did not provide relevant potential increases in same-day discharge rates.
Study context
- Population
- Patients eligible for same-day hip and knee replacement by predefined clinical criteria, six Danish departments, September 2022 to April 20246 departments
- Participants
- 5,387 patients
- Comparison
- Three machine learning models of increasing complexity for prediction of same-day discharge
- Outcome
- Prediction of successful same-day discharge (AUC)
Methodological detailsmachine learning model development, multicentre
- Machine learning model development
- Multicentre
Performance
As reported in the abstract
Prediction of successful same-day discharge (area under the ROC curve)
AUC of the three models of increasing complexity: poor but marginally increasing predictive ability
0.586, 0.602, and 0.603
Further findings
Mean
| Outcome | Discharged same-day | Admitted same-day | Planned in-patients | P value |
|---|---|---|---|---|
| Mean predicted probability of same-day dischargeDischarged same-day vs Admitted same-day | 69.90% (SD 7.6) | 67.03 (SD 8.3) | 67.52% (SD 7.5) | P < 0.001 |
| Mean predicted probability of same-day dischargeAdmitted same-day vs Planned in-patients | P = 0.14 |
Same-day discharge among patients scheduled for same-day surgery
- Scheduled for same-day surgery
- 4466 (82.9%)
- Achieved same-day discharge
- 3085 (69.1%)
- Admitted
- 1381 (30.9%)
- Planned as in-patients
- 921 (17.1%)
Potential increase in same-day discharge (clinical utility)
- At current same-day surgical capacity of 82.9% of procedures
- 2.2%
- Increased with lower capacities
Parts of this Brief are withheld: the automatic checks could not confirm them against the abstract.
Original publication
Development and Clinical Utility of Machine Learning Models for Prediction of Same‐Day Discharge in Outpatient Hip and Knee Replacement: A Prognostic Study. Acta Anaesthesiol Scand. Published 2 August 2026. doi:10.
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