Sample size
TJA
Cumulative MDE consumption within 24 h was the main result of the study. Based on experience and institutional pre-experimental data, the mean ± standard deviation (SD) dose of MDE in patients who underwent simultaneous bilateral TJA and did not use dexamethasone within 24 h after surgery was 78.6 (58.3) mg. In order to prove that the addition of dexamethasone to LIA can reduce the consumption of opioids within 24 h by 30% [