Table 2.
2-Year Postoperative Outcomes
| Outcome Measure | Hip or Knee OA Patients With Outcome (n, %) | No Hip or Knee OA Patients With Outcome (n, %) | RR (OA: No OA) | RR 95% CI | P-Value |
| Surgical interventions | |||||
| Repeat lumbar spine surgery (decompression or fusion) | 122 (5.3) | 116 (5.1) | 1.052 | 0.821-1.347 | 0.69 |
| Lumbar fusion | 96 (4.2) | 93 (4.1) | 1.032 | 0.781-1.365 | 0.82 |
| Lumbar decompression | 62 (2.7) | 52 (2.3) | 1.192 | 0.829-1.716 | 0.34 |
| Primary THA or TKA | 191 (8.3) | 29 (1.3) | 6.586 | 4.476-9.692 | <0.01 |
| Mental health disorders and opioid use | |||||
| Depression or anxiety | 757 (33.1) | 628 (27.4) | 1.205 | 1.103-1.317 | <0.01 |
| New onset depression or anxiety | 156 (11.7) | 121 (8.8) | 1.339 | 1.069-1.677 | 0.01 |
| Prolonged opioid use | 1090 (47.6) | 836 (36.5) | 1.304 | 1.217-1.397 | <0.01 |
| Resource utilization | |||||
| Hospitalization | 788 (34.4) | 595 (26.0) | 1.324 | 1.211-1.448 | <0.01 |
| No. of hospitalizationsa | 2.0 ± 7.9 | 1.2 ± 4.1 | N/A | N/A | <0.01 |
| ED visit | 700 (30.6) | 483 (21.1) | 1.449 | 1.311-1.602 | <0.01 |
| No. of ED visits (avg. ± SD)a | 0.9 ± 2.3 | 0.6 ± 2.2 | N/A | N/A | <0.01 |
| Ambulatory visit | 2060 (90.0) | 2007 (87.7) | 1.026 | 1.006-1.048 | 0.01 |
| No. of ambulatory visits (avg. ± SD)a | 48.7 ± 61.5 | 29.9 ± 46.0 | N/A | N/A | <0.01 |
CI = confidence interval, ED = emergency department, OA = osteoarthritis, RR = risk ratio, THA = total hip arthroplasty, TKA = total knee arthroplasty
P values <0.05 are in bold.
a
Denotes two-sided independent samples Student t-test.