Table IV.

Trends in opioid use following joint arthroplasty amongst non-opioid users

Total patients	TKA		THA		UKA		Risk Ratio (95% CI)
(mths)	Patients	%	Patients	%	Patients	%	TKA vs THA	UKA vs TKA	UKA vs THA
	29 901	100	15 093	100	1733	100
1	15 544	52.2	6646	44.0	999	57.6	1.18 (1.16 to 1.21)	1.11 (1.06 to 1.15)	1.31 (1.25 to 1.37)
2	6321	21.2	1426	9.4	231	13.3	2.24 (2.13 to 2.37)	0.63 (0.56 to 0.71)	1.41 (1.24 to 1.61)
3	3046	10.2	730	4.8	112	6.5	2.11 (1.95 to 2.29)	0.63 (0.53 to 0.76)	1.34 (1.10 to 1.62)
4	1882	6.3	561	3.7	78	4.5	1.69 (1.55 to 1.86)	0.71 (0.57 to 0.89)	1.21* (0.96 to 1.53)
5	1410	4.7	477	3.2	64	3.7	1.50 (1.35 to 1.66)	0.78 (0.61 to 0.99)	1.17* (0.96 to 1.51)
6	1191	4.0	460	3.0	55	3.2	1.31 (1.18 to 1.46)	0.79* (0.61 to 1.03)	1.04* (0.80 to 1.37)
7	1101	3.7	460	3.0	56	3.2	1.21 (1.09 to 1.35)	0.87* (0.67 to 1.14)	1.06* (0.81 to 1.39)
8	1012	3.4	420	2.8	56	3.2	1.22 (1.09 to 1.37)	0.95* (0.73 to 1.24)	1.16* (0.89 to 1.56)
9	951	3.2	430	2.8	59	3.4	1.12 (1.01 to 1.25)	1.07* (0.82 to 1.38)	1.19* (0.91 to 1.56)
10	942	3.2	419	2.8	60	3.5	1.14 (1.02 to 1.28)	1.09* (0.84 to 1.42)	1.25* (0.96 to 1.63)
11	935	3.1	432	2.9	72	4.2	1.10* (0.98 to 1.23)	1.32 (1.05 to 1.67)	1.45 (1.14 to 1.85)
12	969	3.3	440	2.9	65	3.8	1.11* (0.99 to 1.25)	1.15* (0.90 to 1.48)	1.29* (0.99 to 1.66)

Data presented as risk ratios (95% confidence interval) *95% confidence interval crosses 1, thus risk ratio is not significant UKA, unicompartmental knee arthroplasty; THA, total hip arthroplasty; TKA, total knee arthroplasty