Table 1.
Model input variables
| Variable | Rate | |
|---|---|---|
| Rate of irrigation and débridement as an initial strategy | 67% | |
| Rate of one-stage as an initial strategy | 10% | |
| Rate of two-stage as an initial strategy | 23% | |
| Failure rate for irrigation and débridement during the first year | 30% | |
| Failure rate for irrigation and débridement after the first year | 56.7% | |
| Failure rate for single-stage during the first year | 9.8% | |
| Failure rate for single-stage after the first year | 12.4% | |
| Failure rate for two-stage in the first year | 4.27% | |
| Failure rate for two-stage after the first year | 8.6% | |
| Rate of aseptic revision after infection (loosening, dislocation, fracture) | 5.6%r | |
| Failure rate of aseptic revision THA | 13.1% | |
| Rate and cost of medical complications after revision THA | Rate | Cost |
| Mortality | 1.16% | |
| Deep vein thromboembolism | 0.82% | $9287 |
| Pulmonary embolism | 0.48% | $10,411 |
| Myocardial infarction | 0.47% | $13,100 |
| Pneumonia | 0.93% | $6666 |
| Urinary tract infection | 1.56% | $896 |
| Stroke | 0.29% | $15,300 |
| Transfusion | 68.4% | $3071 |
| Overall medical complication rate (not including transfusion or death) | 4.55% | |
| Weighted average cost of complications | $2409 | |
| Other costs | ||
| Cost of aseptic revision THA | $35,997 (direct hospital costs) | |
| Treatment cost for the first year after infection | 1st 90 Days | Remainder of 1st year (add $5386) |
| Inpatient rehabilitation (10.2%) | $80,491 | $85,877 |
| Skilled nursing facility (20.2%) | $48,955 | $54,341 |
| Home health care (25.2%) | $37,370 | $42,756 |
| Home with outpatient physical therapy (42.1%) | $31,558 | $36,944 |
| Weighted average for the first year postinpatient costs | $46,189 | |
| Treatment cost after the first year | $187 | |
| Cost of nonsurgical treatment for infection (long-term antibiotics) | Annual cost approximately $7500 | |