Table 2 Elixhauser comorbidity profile collected from the NIS database of patients undergoing TKA and rTKA from 2006 to the third quarter of 2015

Hypertension

3,997,142 (67.74%)

303,063 (65.04%)

Obesity

1,282,015 (21.73%)

139,138 (22.98%)

Uncomplicated Diabetes

1,170,292 (19.83%)

92,345 (19.82%)

Hypothyroidism

918,912 (15.57%)

69,510 (14.92%)

Chronic Pulmonary Disease

872,937 (14.79%)

77,083 (16.54%)

Depression

746,350 (12.65%)

67,245 (14.43%)

Deficiency Anemias

740,986 (12.56%)

73,030 (15.67%)

Renal Failure

223,995 (3.97%)

30,362 (6.52%)

Rheumatoid Arthritis/Collagen Vascular Disease

227,961 (3.86%)

29,431 (6.32%)

Other Neurological Disorders

227,335 (3.85%)

23,901 (5.13%)

Valvular Disease

210,353 (3.57%)

21,333 (4.58%)

Congestive Heart Failure

146,451 (2.48%)

23,732 (5.09%)

Psychoses

121,032 (2.05%)

13,002 (2.79%)

Peripheral Vascular Disorders

117,924 (2.00%)

12,417 (2.67%)

Coagulopathy

109,935 (1.86%)

13,889 (2.97%)

Complicated Diabetes

102,091 (1.73%)

11,439 (2.46%)

Chronic Blood Loss Anemias

92,020 (1.56%)

8,420 (1.81%)

Pulmonary Circulation Disorders

56,952 (0.97%)

6,222 (1.34%)

Liver Disease

52,308 (0.89%)

7,274 (1.56%)

Alcohol Abuse

49,504 (0.84%)

5,610 (1.20%)

Drug Abuse

26,544 (0.45%)

4,719 (1.01%)

Solid Tumor without Metastasis

24,025 (0.41%)

2,376 (0.51%)

Paralysis

14,952 (0.25%)

1,909 (0.41%)

Lymphoma

13,509 (0.23%)

1,956 (0.42%)

Weight Loss

13,221 (0.22%)

6,132 (1.32%)

Metastatic Cancer

3,979 (0.07%)

871 (0.19%)

Acquired Immune Deficiency Syndrome (AIDS)

1,089 (0.02%)

185 (0.04%)

Peptic Ulcer Disease Excluding Bleeding

1,199 (0.02%)

94 (0.02%)