Table I.

Trends in opioid use following joint arthroplasty amongst all patients regardless of opioid user status

Total patients	TKA		THA		UKA		Risk ratio (95% CI)
mths	Patients (n)	%	Patients (n)	%	Patients (n)	%	TKA vs THA	TKA vs UKA	THA vs UKA
	73 959	100	37 393	100	4205	100
1	51 279	69.3	22 580	60.4	2110	50.2	1.14 (1.13 to 1.16)	1.38 (1.34 to 1.42)	1.20 (1.17 to 1.24)
2	28 230	38.2	9524	25.5	905	21.5	1.50 (1.47 to 1.53)	1.77 (1.67 to 1.88)	1.18 (1.11 to 1.26)
3	18 451	24.9	6976	18.7	599	14.2	1.34 (130 to 1.37)	1.75 (1.62 to 1.88)	1.31 (1.21 to 1.41)
4	14 780	20.0	6280	16.8	512	12.2	1.19 (1.16 to 1.22)	1.64 (1.51 to 1.78)	1.40 (1.27 to 1.50)
5	13 106	17.7	5927	15.9	461	11.0	1.12 (1.09 to 1.15)	1.62 (1.48 to 1.76)	1.45 (1.32 to 1.58)
6	12 070	16.3	5643	15.1	437	10.4	1.08 (1.05 to 1.11)	1.57 (1.43 to 1.72)	1.45 (1.32 to 1.59)
7	11 614	15.7	5516	14.8	419	10.0	1.06 (1.03 to 1.10)	1.57 (1.44 to 1.73)	1.48 (1.35 to 1.53)
8	11 380	15.4	5347	14.3	431	10.2	1.08 (1.04 to 1.11)	1.50 (1.37 to 1.64)	1.40 (1.27 to 1.53)
9	10 995	14.9	5256	14.1	439	10.4	1.06 (1.03 to 1.09)	1.42 (1.30 to 1.56)	1.35 (1.23 to 1.48)
10	10 780	14.6	5110	13.7	419	10.0	1.07 (1.03 to 1.10)	1.46 (1.33 to 1.60)	1.37 (1.25 to 1.51)
11	10 750	14.5	5204	13.9	441	10.5	1.04 (1.01 to 1.08)	1.39 (1.27 to 1.52)	1.33 (1.21 to 1.45)
12	10 825	14.6	5139	13.7	414	9.8	1.06 (1.03 to 1.10)	1.48 (1.35 to 1.63)	1.40 (1.27 to 1.53)

TKA, total knee arthroplasty; THA, total hip arthroplasty; UKA, unicompartmental knee arthroplasty; CI, confidence interval