Table 7.

IPACK or PAI

Year	Author	Type of study	Sample size	Method	Results
2020	Vichainarong et al. (Vichainarong et al. 2020)	A prospective, randomized, double-blind study	72	PAI + CACB vs iPACK + PAI + CACB	iPACK + PAI + CACB does not reduce postoperative opioid consumption (p = 0.08)
2019	Kim et al. (Kim et al. 2019)	A triple-blinded, randomized controlled trial	86	PAI vs iPACK + ACB + modified PAI	iPACK + ACB + PAI significantly improved analgesia (p = 0.001) and reduced opioid consumption (p = 0.005)
2021	Kertkiatkachorn et al. (Kertkiatkachorn et al. 2021)	A prospective, randomized controlled trial	66	Continuous ACB + iPACK vs continuous ACB + PAI	ACB with IPACK block provides a non-inferior analgesia
2021	Naranjo et al. (2021)	A prospective, randomized controlled trial	80	iPACK + ACB vs PAI + ACB	iPACK + ACB was more effective in reducing pain after TKA (p < 0.01)