TABLE IV.

Comparison Between Current Study and Other Published Evidence on Reduction in Pain Benefits in Opioid Users Compared with Non-Users

Study	Joint	Time Frame	Scale	Reduction in Benefits in Opioid Users (%)	P Value
Radcliff et al.22	Spine	4 yr	ODI	0.8	0.790
Morris et al.15	Shoulder	2-9 yr	ASES score	14.5	0.005
Zywiel et al.16	Knee	2-7 yr	Knee Society objective score	14.1	<0.001
Pivec et al.10	Hip	58 mo	Harris hip score	7.7	0.002
Nguyen et al.17	Hip and knee	6-12 mo	WOMAC	21.4	<0.01
Present study	Knee	6 mo	WOMAC	8.9	<0.001