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. Author manuscript; available in PMC: 2015 May 1.
Published in final edited form as: Arthritis Care Res (Hoboken). 2015 May;67(5):718–724. doi: 10.1002/acr.22497

Table 4. Comparison of characteristics for rheumatoid arthritis and osteoarthritis patients by calendar year.

Year
2009 2010 2011
OA RA OA RA OA RA
N (%) N (%) N (%) N (%) N (%) N (%)
All 10233 98.5 156 1.5 11571 98.5 180 1.5 12011 98.7 160 1.3
TJA THA 3561 34.8 47 30.1 3831 33.1 65 36.1 4056 33.8 55 34.4
TKA 6672 65.2 109 69.9 7740 66.9 115 63.9 7955 66.2 105 65.6
Age category, years <65 4067 39.7 84 53.9 4435 38.3 104 57.8 4735 39.4 91 56.9
>=65 6166 60.3 72 46.2 7136 61.7 76 42.2 7276 60.6 69 43.1
Female gender Female 6274 61.3 110 70.5 7084 61.2 135 75.0 7336 61.1 118 73.8
Race1 White 7260 71.0 75 48.1 7997 69.1 78 43.3 8285 69.0 70 43.8
Hispanic 1266 12.4 39 25.0 1476 12.8 54 30.0 1713 14.3 53 33.1
Black 894 8.7 22 14.1 1090 9.4 22 12.2 1065 8.9 22 13.8
Asian 585 5.7 15 9.6 784 6.8 25 13.9 745 6.2 14 8.8
Other/Multi 211 2.1 4 2.6 208 1.8 1 0.6 190 1.6 1 0.6
BMI category (kg/m2)1 <30 5109 49.9 105 67.3 5818 50.3 97 53.9 6144 51.2 90 56.3
30-34 2909 28.4 23 14.7 3245 28.0 50 27.8 3383 28.2 38 23.8
≥35 2208 21.6 28 18.0 2507 21.7 33 18.3 2480 20.7 32 20.0
ASA category 1&2 6023 58.9 85 54.5 6825 59.0 82 45.6 7067 58.8 81 50.6
>=3 4145 40.5 70 44.9 4655 40.2 97 53.9 4874 40.6 79 49.4
Diabetes 2534 24.8 31 19.9 2784 24.1 36 20.0 2809 23.4 28 17.5
Deficiency Anemia 1358 13.3 34 21.8 1366 11.8 47 26.1 1391 11.6 42 26.3
LOS <=2 day 3035 29.7 39 25.0 4397 38.0 56 31.1 5456 45.4 71 44.4
3 day 5209 50.9 86 55.1 5339 46.1 89 49.4 5000 41.6 72 45.0
4 day 1276 12.5 19 12.2 1162 10.0 23 12.8 1019 8.5 11 6.9
>=5 day 673 6.6 11 7.1 655 5.7 11 6.1 524 4.4 6 3.8
Surgeon TJA Fellowship Fellowship 3907 38.2 78 50.0 4609 39.8 76 42.2 4846 40.4 77 48.1
Hospital yearly volume, cases/yr <100 515 5.0 8 5.1 583 5.0 6 3.3 709 5.9 9 5.6
100-199 3928 38.4 53 34.0 4597 39.7 75 41.7 4872 40.6 63 39.4
>=200 5790 56.6 95 60.9 6391 55.2 99 55.0 6430 53.5 88 55.0
Surgeon yearly volume, cases/yr <20 916 9.0 14 9.0 1061 9.2 16 8.9 1137 9.5 15 9.4
20-49 4372 42.7 61 39.1 4810 41.6 86 47.8 5105 42.5 73 45.6
>=50 4945 48.3 81 51.9 5700 49.3 78 43.3 5769 48.0 72 45.0
Discharge disposition Home 8074 78.9 121 77.6 9017 77.9 144 80.0 9539 79.4 126 78.8
Other 2125 20.8 34 21.8 2535 21.9 36 20.0 2455 20.4 34 21.3
Intra-operative complications Surgical 488 4.8 7 4.5 507 4.4 10 5.6 481 4.0 4 2.5
Non Surgical 85 0.8 3 1.9 100 0.9 1 0.6 92 0.8 0 0.0
1

Missing data: race (n=47, <0.1%), BMI (n=12, <0.1%), ASA (n=228, 0.7%), discharge disposition (n=71, 0.2%), LOS (n=72, 0.2%).

OA=Osteoarthritis. RA=Rheumatoid Arthritis. TJA=Total Joint Arthroplasty. THA=Total Hip Arthroplasty. TKA= Total Knee Arthroplasty. BMI=Body Mass Index. ASA=American Society of Anesthesiologists. LOS=Length of Stay.