Does Psychological Health Influence Hospital Length of Stay Following Total Knee Arthroplasty? A Systematic Review.

ABSTRACT

OBJECTIVE: To systematically review the literature to determine if preoperative psychological health affected hospital length of stay among adults following primary unilateral total knee arthroplasty. DATA SOURCES Systematic review. We searched 6 online databases for original research published before December 31, 2016, that investigated adults undergoing primary unilateral total knee arthroplasty. STUDY SELECTION We included studies that used any measure of preoperative psychological health and reported length of stay, irrespective of study design. We excluded studies that considered participants with cognitive impairment or substance abuse; studies that considered participants who experienced revision, bilateral or hip surgery; and studies that did not have full text available in English. DATA EXTRACTION One review author screened 438 titles and abstracts for inclusion. Another author reviewed a 10% sample of excluded studies for adherence to the review protocol, with no violations observed. For all included studies, 2 authors independently extracted data from each study using a form designed a priori and independently assessed study quality according to the Joanna Briggs Checklist for Cohort Studies. DATA SYNTHESIS: In view of the heterogeneity of the included studies, we present a narrative synthesis . Of the 7 included studies, 5 reported statistically significant increases in hospital length of stay among those with worse preoperative psychological health. These differences were often <1 calendar day, and, therefore, the clinical significance of these results remains unknown, but the potential to reduce health care costs may still be significant. CONCLUSIONS: Adults experiencing worse preoperative psychological health before total knee arthroplasty may have a longer hospital stay compared to those with unremarkable psychological health.