Table 3.

Two-year revision estimates stratified by age and gender in hip and knee arthroplasty: New York and California statewide claims data.

	New York			California
	Total N	Two-year revision rate (95% CI)	Septic revision rate (95% CI)	Total N	Two-year revision rate (95% CI)	Septic revision rate (95% CI)
Total hip arthroplasty
Total	65 109	2.1% (1.9–2.2%)	0.5% (0.4–0.5%)	67 717	2.6% (2.4–2.7%)	0.5% (0.5–0.6%)
<55 age
<55 Males	5412	1.6% (1.3–2.0%)	0.4% (0.3–0.7%)	4675	2.3% (1.8–2.9%)	0.7% (0.5–1.0%)
<55 Females	4836	2.4% (1.9–2.9%)	0.6% (0.4–0.9%)	3888	3.4% (2.8–4.2%)	0.7% (0.4–1.0%)
55–64 age
55–64 Males	10 248	1.7% (1.4–2.0%)	0.5% (0.4–0.7%)	9729	2.4% (2.1–2.9%)	0.6% (0.5–0.9%)
55–64 Females	9923	2.0% (1.7–2.3%)	0.5% (0.3–0.6%)	9941	2.5% (2.2–2.9%)	0.4% (0.2–0.5%)
≥65 age
≥65 Males	13 347	2.1% (1.9–2.4%)	0.6% (0.4–0.7%)	15 413	2.3% (2.0–2.5%)	0.6% (0.5–0.8%)
≥65 Females	21 343	2.3% (2.1–2.5%)	0.4% (0.3–0.5%)	24 071	2.7% (2.5–3.0%)	0.4% (0.3–0.5%)
Total knee arthroplasty
Total	96 453	1.8% (1.7–1.9%)	0.5% (0.5%-0.6%)	116 559	2.1% (1.9–2.2%)	0.6% (0.5–0.6%)
<55 age
<55 Males	3836	3.6% (2.9–4.4%)	0.9% (0.6–1.3%)	3707	4.4% (3.6–5.4%)	1.3% (1.0–1.8%)
<55 Females	6547	2.9% (2.4–3.4%)	0.6% (0.4–0.8%)	5320	3.7% (3.0–4.5%)	0.8% (0.5–1.2%)
55–64 age
55–64 Males	11 342	2.5% (2.2–2.9%)	0.9% (0.7–1.2%)	13 353	2.2% (1.9–2.6%)	0.6% (0.5–0.8%)
55–64 Females	17 927	2.0% (1.8–2.3%)	0.4% (0.3–0.5%)	18 910	2.2% (1.9–2.5%)	0.5% (0.4–0.6%)
≥65 age
≥65 Males	19 664	1.6% (1.4–1.8%)	0.6% (0.5–0.7%)	28 319	2.0% (1.8–2.2%)	0.7% (0.6–0.9%)
≥65 Females	37 137	1.2% (1.1–1.3%)	0.3% (0.3–0.4%)	46 950	1.6% (1.4–1.8%)	0.4% (0.3–0.5%)