Table II.
Surgical complications.
| Variable | mUKA, n (% (95% CI)) | OR (95% CI) | p-value* | ||
|---|---|---|---|---|---|
| All | High-usage | Low-usage | |||
| Total, n | 3,757 | 2,377 | 1,380 | ||
| Readmissions due to surgical complications | 69 (1.8 (1.4 to 2.3)) | 45 (1.9 (1.4 to 2.5))† | 24 (1.7 (1.1 to 2.6)) | 1.1 (0.65 to 1.8) | 0.802 |
| PJI | 18 (0.48 (0.28 to 0.76)) | 9 (0.38 (0.17 to 0.72)) | 9 (0.65 (0.30 to 1.2)) | 0.58 (0.22 to 1.6) | 0.327 |
| DAIR | 11 (0.29) | 7 (0.29) | 4 (0.29) | ||
| Revision | 7 (0.19) | 2 (0.08) | 5 (0.36) | ||
| Periprosthetic fracture | 13 (0.35 (0.18 to 0.59)) | 7 (0.29 (0.11 to 0.61)) | 6 (0.43 (0.16 to 0.94)) | 0.68 (0.20 to 2.0) | 0.567 |
| Conservatively treated | 2 (0.05) | 1 (0.04) | 1 (0.07) | ||
| Reoperation (ORIF) | 6 (0.16) | 2 (0.08) | 4 (0.29) | ||
| Revision | 5 (0.13) | 4 (0.17) | 1 (0.07) | ||
| Suspected superficial wound infection | 8 (0.21 (0.09 to 0.42)) | 5 (0.21 (0.07 to 0.49)) | 3 (0.22 (0.04 to 0.63)) | 0.97 (0.24 to 4.7) | 1.000 |
| Bearing dislocation | 7 (0.19 (0.07 to 0.38)) | 6 (0.25 (0.09 to 0.55)) | 1 (0.07 (< 0.01 to 0.40)) | 3.5 (0.47 to 79) | 0.434 |
| Wound-related issue | 14 (0.37 (0.20 to 0.62)) | 11 (0.46 (0.23 to 0.83)) | 3 (0.22 (0.04 to 0.63)) | 2.1 (0.58 to 9.0) | 0.279 |
| Manipulation under anaesthesia | 3 (0.08 (0.02 to 0.23)) | 3 (0.13 (0.03 to 0.37)) | 0 | N/A | 0.303 |
| Arthroscopic removal of cement | 5 (0.13 (0.04 to 0.31)) | 3 (0.13 (0.02 to 0.37)) | 2 (0.14 (0.02 to 0.52)) | 0.87 (0.14 to 7.0) | 1.000 |
*
Fisher’s exact test.
†
One of the 45 surgical complications in high-usage centres was a revision due to an increased valgus malalignment and lateral OA progression.
CI, confidence interval; DAIR, debridement, antibiotics, and implant retention; N/A, not applicable; OA, osteoarthritis; OR, odds ratio; ORIF, open reduction and internal fixation; PJI, periprosthetic joint infection; UKA, unicompartmental knee arthroplasty.