Table 4. Comparisons of Perioperative Costs for Manual vs Robotic KA Patients.
| UKA | TKA | |||||
|---|---|---|---|---|---|---|
| Cost | mUKA (n=6) | rUKA (n=29) | P Value | mTKA (n=58) | rTKA (n=85) | P Value |
| Anesthesia | ||||||
| Mean (SD) | 523 (52) | 586 (111) | .14 | 628 (90) | 714 (103) | <.0001b |
| Range | (435, 879) | (416, 861) | (427, 825) | (530, 1104) | ||
| Imaging | ||||||
| Mean (SD) | 26 (2) | 40 (52) | .12 | 30 (7) | 42 (59) | .0003b |
| Range | (24, 28) | (24, 306) | (24, 66) | (16, 439) | ||
| Labs | ||||||
| Mean (SD) | 45 (18) | 36 (46) | .55 | 49 (36) | 65 (69) | .06 |
| Range | (30, 72) | (2, 255) | (1, 216) | (1, 408) | ||
| Operating room | ||||||
| Mean (SD) | 610 (258) | 368 (129) | .002b | 403 (174) | 354 (124) | .05 |
| Range | (194, 936) | (210, 674) | (163, 805) | (163, 713) | ||
| Other inpatient | ||||||
| Mean (SD) | 305 (323) | 363 (252) | .66 | 415 (280) | 361 (247) | .27 |
| Range | (27, 754) | (43, 670) | (27, 1059) | (34, 753) | ||
| Physician | ||||||
| Patients with any, n (%) | 1 (1) | 20 (69) | .03a | 32 (5) | 54 (64) | 0.38 |
| Mean (SD) | 15 (38) | 60 (57) | .93 | 75 (91) | 72 (86) | 0.33 |
| Range | (0, 93) | (0, 167) | (0, 274) | (0, 318) | ||
| Preoperative CT | ||||||
| Patients with any, n (%) | 0 (0) | 29 (100) | 0 (0) | 85 (100) | ||
| Mean (SD) | — | 114 (22) | <.0001b | — | 115 (23) | <.0001b |
| Range | — | (74, 157) | — | (74, 165) | ||
| Preopertive prep | ||||||
| Mean (SD) | 446 (287) | 400 (302) | .75 | 400 (307) | 494 (328) | .15 |
| Range | (170, 728) | (87, 849) | (86, 901) | (86, 1001) | ||
| Recovery | ||||||
| Mean (SD) | 226 (205) | 613 (375) | .008a | 258 (434) | 602 (724) | <.0001b |
| Range | (70, 625) | (65, 1605) | (42, 1836) | (28, 2629) | ||
| Room | ||||||
| Patients with any, n (%) | 4 (67) | 4 (14%) | 52 (90) | 49 (58) | ||
| Mean (SD) | 281 (218) | 82 (217) | .02a | 725 (593) | 531 (677) | <.0001b |
| Range | (0, 436) | (0, 847) | .04a | (0, 3390) | (0, 2542) | .29 |
| Supplies | ||||||
| Mean (SD) | 651 (176) | 1161 (384) | <.0001b | 868 (518) | 1042 (525) | .03a |
| Range | (435, 850) | (713, 2034) | (406, 3340) | (456, 2130) | ||
| Therapy | ||||||
| Mean (SD) | 160 (44) | 201 (76) | .24 | 235 (103) | 287 (126) | .01b |
| Range | (121, 235) | (28, 370) | (86, 442) | (71, 663) | ||
| Total perioperative costs | ||||||
| Mean (SD) | 3287 (271) | 4025 (489) | .0001b | 4087 (1085) | 4668 (644) | <.0001b |
| Range | (3002, 3632) | (2674, 4719) | (2745, 7903) | (3330, 6376) | ||
| Length of stay (days) | ||||||
| Mean (SD) | 1.6 (0.5) | 1.4 (0.6) | .51 | 1.8 (0.6) | 1.8 (0.8) | .94 |
| Range | (1.2, 2.3) | (0.4, 3.3) | (1.1, 3.3) | (0.4, 4.2) | ||
| Same-day discharge, n (%) | 0 (0.0) | 3 (10.3) | 0 (0.0) | 2 (2.4) |
Abbreviations: mTKA, manual total knee arthroplasty; manual unicompartmental knee arthroplasty; rTKA, robotic arm–assisted total knee arthroplasty; rUKA, robotic arm–assisted unicompartmental knee arthroplasty; TKA, total knee arthroplasty; UKA, unicompartmental knee arthroplasty.
aP < .05.
bP < .001.