Baseline, worst-case and best-case lifetime incremental cost:utility ratios for each cohort*
| Procedure | Lifetime† | Worst-case‡ | Best-case§ |
|---|---|---|---|
| THA | 5 321 | 11 680 | 2 235 |
| TKA | 11 275 | 27 534 | 4 016 |
| Spine decompression | 2 307 | 6 203 | 953 |
| Spine decompression with fusion | 7 153 | 17 676 | 2 768 |
QALY = quality adjusted life years; THA = total hip arthroplasty; TKA = total knee arthroplasty.
↵* Expressed in dollars per QALY and discounted at a 3% annualized rate.
↵† Based on life expectancies of 20.4, 19.1 and 19.6 years for hip, knee and spine patients, respectively.
↵‡ The worst-case scenario ICUR was calculated using the following parameters: the lower limit of the 95% CI for utility, the mean primary surgery cost plus 25%, the mean revision surgery cost plus 25%, the upper range of revision rate, 60% inpatient rehabilitation for THA and TKA, and a 5% discount rate.
↵§ The best-case scenario ICUR was calculated using the following parameters: the upper limit of the 95% CI for utility, the mean primary surgery cost minus 25%, the mean revision surgery cost minus 25%, the lower range of revision rate, 0% inpatient rehabilitation for THA and TKA, and a 0% discount rate.