Anesthesia modality in arthroplasty: comparator and evidence limits
Educational work by a pre-medical student — not medical advice. Not a clinical protocol, prescription, or patient handout, and not for patient care. See DISCLAIMER.
Independent educational note, revised 27 October 2026. This replaces unverified numerical effects and blanket superiority claims.
Johnson et al., 2016, PMID 26787787 reviewed randomized and prospective comparative hip/knee arthroplasty evidence. It found a modest length-of-stay difference, while several major outcomes showed no statistically detected difference. Mixed operations, older practice and heterogeneity limit direct application to a current individual TKA pathway.
ICAROS, 2019, PMID 31351590 includes retrospective and database observational studies as well as randomized evidence and favors neuraxial anesthesia in its consensus recommendations. For knee arthroplasty specifically, the preference is a weak recommendation based on low-level evidence; the hip arthroplasty recommendation was strong. This broader evidence design is relevant when comparing its conclusions with the earlier prospective-study review. It is not proof of universal causal benefit or a mandate for a particular patient.
Interpretation
- Separate randomized evidence from observational associations and their possible selection/confounding effects.
- Identify the operation, anesthetic technique, analgesic background, thromboprophylaxis, time period and outcome.
- A nonsignificant superiority comparison is not a formal equivalence or non-inferiority result.
- A hip-fracture trial is not direct evidence for elective primary TKA.
- A procedure-specific decision also depends on patient preference, contraindications, clinician expertise and local resources; this note supplies no selection algorithm.
For antithrombotic considerations, consult the current ASRA guideline index, which lists the fifth edition. The historical 2018 fourth edition is not presented as the current dosing/timing authority. No hold interval or patient-care instruction is reproduced here.