NJR UKA vs TKA matched study (Liddle)

Adverse outcomes after total and unicompartmental knee replacement in 101,330 matched patients: a study of data from the National Joint Registry for England and Wales.

Liddle AD, Judge A, Pandit H, et al. Lancet (London, England) 2014 · PMID 25012116 · doi:10.1016/s0140-6736(14)60419-0

Registry studyPrognosisKnee arthroplastyCitation checked

Question: How do mortality, complications and revision compare between unicompartmental and total knee replacement in matched patients?
Design: Propensity score-matched analysis of National Joint Registry data linked to Hospital Episode Statistics.
Patients: Matched patients undergoing primary UKA or TKA in England and Wales.
Intervention: Unicompartmental knee replacement
Comparison: Total knee replacement
Primary outcome: Mortality, complications, length of stay, readmission, reoperation and revision
Key result: UKA had significantly lower early mortality, fewer thromboembolic events, myocardial infarctions and strokes, shorter stay and fewer readmissions, but significantly higher revision and reoperation rates.
Limitations: Observational data subject to residual confounding; revision as an endpoint is biased because a failed UKA is easier to revise.
Impact on practice: Frames the trade-off between UKA's safety and recovery advantages and its higher revision risk, informing patient consent and the case for TOPKAT.

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