“…Among the 18 studies included in this analysis, 12 studies [14,[22][23][24][25][26][27][28][29][30][31][32] were based on administrative data and 6 studies [15,21,[33][34][35][36] on hospital data. Among the 18 studies, 4 studies [23,27,29,31] reported the outcome of THA, 7 studies [22,24,28,[32][33][34][35] reported the outcome of TKA, and the remaining 7 studies [14,15,21,25,26,30,36] reported the outcomes of both THA and TKA.…”