TABLE III.
Comorbidities of Patients with All-Cause or TKA-Specific Readmission 30 Days After TKA
| 30-Day Readmissions*
(no. [%]) |
||||
| Elixhauser Comorbidity Measure | CMS TKA-Specific† (N = 2,449) | Expanded TKA-Specific‡ (N = 6,784) | All-Cause§ (N = 22,076) | No Readmission (N = 355,629) |
| Congestive heart failure | 94 (3.8%) | 259 (3.8%) | 776 (3.5%) | 5,928 (1.7%) |
| Valvular disease | 131 (5.3%) | 331 (4.9%) | 1,395 (6.3%) | 15,570 (4.4%) |
| Pulmonary circulation disorder | 37 (1.5%) | 69 (1.0%) | 205 (0.9%) | 2,016 (0.6%) |
| Peripheral vascular disorder | 58 (2.4%) | 163 (2.4%) | 510 (2.3%) | 5,773 (1.6%) |
| Paralysis | 7 (0.3%) | 15 (0.2%) | 47 (0.2%) | 511 (0.1%) |
| Other neurological disorder | 73 (3.0%) | 218 (3.2%) | 610 (2.8%) | 7,914 (2.2%) |
| Chronic pulmonary disease | 418 (17.1%) | 1,257 (18.5%) | 3,568 (16.2%) | 48,380 (13.6%) |
| Diabetes | 558 (22.8%) | 1,505 (22.2%) | 4,560 (20.7%) | 66,810 (18.8%) |
| Hypothyroidism | 333 (13.6%) | 893 (13.2%) | 2,872 (13.0%) | 47,296 (13.3%) |
| Renal failure | 108 (4.4%) | 258 (3.8%) | 716 (3.2%) | 7,121 (2.0%) |
| Liver disease | 23 (0.9%) | 88 (1.3%) | 205 (0.9%) | 2,627 (0.7%) |
| Peptic ulcer disease excluding bleeding | 9 (0.4%) | 28 (0.4%) | 120 (0.5%) | 1,370 (0.4%) |
| Lymphoma | 5 (0.2%) | 13 (0.2%) | 41 (0.2%) | 304 (0.1%) |
| Metastatic cancer | 0 (0.0%) | 0 (0.0%) | 10 (0.0%) | 93 (0.0%) |
| Solid tumor without metastasis | 50 (2.0%) | 126 (1.9%) | 694 (3.1%) | 6,549 (1.8%) |
| Rheumatoid arthritis/collagen vascular disease | 137 (5.6%) | 353 (5.2%) | 1,130 (5.1%) | 16,454 (4.6%) |
| Coagulopathy | 42 (1.7%) | 110 (1.6%) | 279 (1.3%) | 3,181 (0.9%) |
| Obesity | 492 (20.1%) | 1,251 (18.4%) | 3,388 (15.3%) | 59,300 (16.7%) |
| Weight loss | 5 (0.2%) | 10 (0.1%) | 21 (0.1%) | 305 (0.1%) |
| Fluid and electrolyte disorders | 70 (2.9%) | 187 (2.8%) | 579 (2.6%) | 7,556 (2.1%) |
| Chronic blood loss anemia | 9 (0.4%) | 23 (0.3%) | 73 (0.3%) | 854 (0.2%) |
| Deficiency anemia | 181 (7.4%) | 499 (7.4%) | 1,628 (7.4%) | 21,774 (6.1%) |
| Alcohol abuse | 20 (0.8%) | 63 (0.9%) | 160 (0.7%) | 2,204 (0.6%) |
| Drug abuse | 17 (0.7%) | 50 (0.7%) | 93 (0.4%) | 1,296 (0.4%) |
| Psychoses | 36 (1.5%) | 119 (1.8%) | 316 (1.4%) | 3,975 (1.1%) |
| Depression | 303 (12.4%) | 788 (11.6%) | 2,057 (9.3%) | 33,386 (9.4%) |
| Hypertension (uncomplicated and complicated combined) | 1,633 (66.7%) | 4,442 (65.5%) | 14,185 (64.3%) | 222,516 (62.6%) |
*
Readmission categories are not mutually exclusive.
†
Readmissions due to any of 8 diagnoses designated by the CMS as TKA-specific complications (see Appendix).
‡
Readmissions due to a diagnosis on an expanded list of TKA-specific complications, including 22 additional TKA-specific complications selected by a group of experts (see Appendix).
§
Readmissions due to all causes, including 918 conditions not included in the CMS-defined or expanded list of TKA-specific complications (see Appendix).