Table 2.

Postoperative outcome

	PAI + iPACK(n = 300)	PAI only(n = 300)	p-value
CPM
Post-op 24 h	95.2 ± 9.23	97.6 ± 11.2	0.004
Post-op 48 h	110.3 ± 10.72	111.6 ± 9.79	0.121
Post-op 72 h	120.2 ± 11.21	119.2 ± 13.20	0.318
Length of Hospital Stay (Days)	3.5 ± 1.2	3.6 ± 1.1	0.287
Cumulative morphine dosage(mg)
Post-op 24 h	3.16 ± 2.12	7.3 ± 3.22	< 0.001
Post-op 48 h	6.72 ± 3.11	16.3 ± 5.69	< 0.001
Post-op 72 h	10.52 ± 4.35	20.2 ± 7.92	< 0.001

PAI, periarticular injection; I-iPACK, intraoperative infiltration of interspace between posterior knee capsule and popliteal artery; CPM, continuous passive motion)