When can I go home after my knee replacement? Factors affecting the duration of in-hospital stay after knee replacement
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Despite a sevenfold decline in the number of postoperative nights (21–3) after a total knee arthroplasty (TKA) over the last four decades, predictors of length of stay (LOS) are not fully understood. We attempted to ascertain these factors by analyzing a large cohort of patients.
Prospectively collected data between January 2016 and March 2017 were retrospectively analyzed at our institute. Charts of 1663 consecutive, simple primary unilateral and bilateral TKAs were reviewed for the LOS excluding staggered bilateral, complex primary and revision knees. Statistical analysis: Preoperative variables [demographics, cash/credit status, historical, clinical, laboratory findings, Knee Society Function Scores and Oxford Knee Scores (OKSs)] were scrutinized by multivariate regression to identify significant factors affecting LOS and formulate model equations for patients and health caregivers. Results were incorporated into an iOS application, which was tested for accuracy.
Poor preoperative OKS, rheumatoid etiology, flexion and hyperextension deformity and delays in insurance affected unilateral TKR LOS, while poor preoperative OKS alone affected LOS in bilateral cases.
KeywordsLength of stay Discharge delays Equations predicting stay Primary total knee arthroplasty Insurance delays Severe deformities
The authors wish to thank and acknowledge the contributions of Mr. Gautam Goud, our statistician, toward the statistical computation of our data and its analysis. No funds or grants were received toward the conduct of this research.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no competing interests.
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