Table 1

Clinical and demographic characteristics of patients

Primary TKA, na (%) unless specified otherwise


2 years (n = 7, 139)

5 years, (n = 4, 234)


Men/women

3, 162 (44.3%)/3, 977 (55.7%)

1903 (44.9%)/2, 331 (55.1%)

Age, mean ± SD

68.4 ± 10.0

68.4 ± 9.6

Age groups, n (%):

≤ 60 years

1, 313 (18.4%)

745 (17.6%)

> 60 to 70 years

2, 531 (35.5%)

1, 576 (37.2%)

> 70 to 80 years

2, 734 (38.3%)

1, 617 (38.2%)

> 80 years

561 (7.9%)

296 (7.0%)

Body mass index, kg/m2:

< 25

934 (13.1%)

566 (13.4)%

25 to 29.9

2, 479 (34.7%)

1, 525 (36.0%)

30 to 34.9

2, 092 (29.3%)

1, 250 (29.5%)

35 to 39.9

976 (13.7%)

573 (13.5%)

≥ 40

605 (8.5%)

303 (7.2%)

ASA score:

Class I to II

4, 115 (57.6%)

2, 467 (58.3%)

Class III to IV

3, 006 (42.1%)

1, 741 (41.1%)

Deyo-Charlson Index, mean ± SD

1.2 ± 1.9

1.1 ± 1.9

Key Deyo-Charlson comorbidities:

Myocardial infarction

341 (4.8%)

202 (4.8%)

Peripheral vascular disease

370 (5.2%)

190 (4.5%)

Renal disease

397 (5.6%)

175 (4.1%)

Chronic obstructive pulmonary disease

762 (10.7%)

408 (9.6%)

Diabetes

669 (9.4%)

349 (8.2%)

Connective tissue disease

520 (7.3%)

352 (8.3%)

Anxiety

465 (6.5%)

220 (5.2%)

Depression

741 (10.4%)

334 (7.9%)

Distance from medical center:

0 to 100 miles

3, 669 (51.4%)

2, 080 (49.1%)

> 100 to 500 miles

2, 731 (38.3%)

1, 653 (39.0%)

> 500 miles

541 (7.6%)

327 (7.7%)

Diagnosis:

Inflammatory arthritis

256 (3.6%)

189 (4.5%)

Osteoarthritis

6, 710 (94.0%)

3, 922 (92.6%)

Other

172 (2.4%)

123 (2.9%)


aMissing values for 2-year cohort: 27 were missing body mass index (BMI), 18 were missing American Society of Anesthesiologists (ASA) class, 3 were missing Charlson Index scores, 198 were missing the distance variable, 1 was missing operative diagnosis. Missing values for 5-year cohort: 17 were missing BMI, 26 were missing ASA class, 174 were missing the distance variable, 23 were missing operative diagnosis.

Singh and Lewallen BMC Medicine 2013 11:62   doi:10.1186/1741-7015-11-62

Open Data