The efficacy and safety of subcutaneous continuous local infiltration analgesia with ropivacaine in patients undergoing total knee arthroplasty: a comparative study

Table 3 Postoperative opioid consumption according to morphine milligram equivalent (MME)

Postoperative time point	Pump (n = 28)		No pump (n = 35)		MD	95% CI		p-value
Postoperative time point	Mean	SD	Mean	SD	MD	Lower limit	Higher limit	p-value
24 h	1.61	2.740	4.86	5.489	-3.250	1.137	-0.976	0.006
48 h	1.07	2.493	3.00	3.873	-1.929	0.845	-0.238	0.026
72 h	0.89	2.378	2.14	3.695	-1.250	0.806	0.362	0.126
24–72 h	3.57	7.052	10.00	11.048	-6.429	2.406	-1.618	0.010

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