Table 3. Baseline Characteristics of Patients in the 4 Groups (UKA vs TKA, Manual vs Robotic).
| UKA | TKA | |||||
| mUKA (n=6) | rUKA (n=29) | |d| | mTKA (n=58) | rTKA (n=85) | |d| | |
| Sex, n (%) | ||||||
| Female | 2 (33) | 16 (55) | 0.45 | 31 (53) | 44 (52) | 0.03 |
| Male | 4 (67) | 13 (45) | 27 (47) | 41 (4) | ||
| Age at surgery (y) | ||||||
| Mean (SD) | 56 (5) | 60 (9) | 0.55 | 66 (10) | 62 (9) | 0.42 |
| Range | (49, 61) | (48, 80) | (44, 88) | (43, 81) | ||
| Race, n (%) | ||||||
| White | 6 (100) | 29 (10) | 0.00 | 58 (100) | 83 (98) | 0.22 |
| Asian | 0 (0 ) | 0 (0 ) | 0.00 | 0 (0 ) | 1 (1 ) | 0.15 |
| Black or African American | 0 (0 ) | 0 (0 ) | 0.00 | 0 (0 ) | 1 (1 ) | 0.15 |
| Hispanic or Latino, n (%) | 0.00 | |||||
| Yes | 0 (0) | 0 (0) | 0.00 | 1 (2) | 0 (0) | 0.19 |
| No | 6 (100) | 29 (100) | 57 (98) | 85 (100) | ||
| ASA score, n (%) | ||||||
| 1 | 0 (0) | 1 (3) | 0.27 | 1 (2) | 1 (1) | 0.05 |
| 2 | 1 (17) | 12 (41) | 0.57 | 39 (67) | 48 (56) | 0.22 |
| 3 | 5 (83) | 16 (55) | 0.64 | 17 (29) | 35 (41) | 0.25 |
| 4 | 0 (0) | 0 (0) | 0.00 | 1 (2) | 1 (1) | 0.05 |
| Surgeon, n (%) | ||||||
| A | 0 (0) | 5 (17) | 0.65 | 0 (0) | 10 (12) | 0.52 |
| B | 3 (50) | 7 (24) | 0.56 | 22 (38) | 34 (40) | 0.04 |
| C | 2 (33) | 6 (21) | 0.29 | 22 (38) | 21 (25) | 0.29 |
| D | 1 (17) | 11 (38) | 0.49 | 14 (24) | 20 (24) | 0.01 |
| Laterality, n (%) | ||||||
| Left | 2 (33) | 17 (59) | 0.52 | 31 (53) | 30 (35) | 0.37 |
| Right | 4 (67) | 12 (41) | 27 (47) | 55 (65) | ||
| Hospital, n (%) | ||||||
| GSACH | 3 (50) | 12 (41) | 0.17 | 22 (38) | 44 (52) | 0.28 |
| GWV | 3 (50) | 17 (59) | 36 (62) | 41 (48) | ||
| Setting, n (%) | ||||||
| Inpatient | 2 (33) | 4 (14) | 0.47 | 52 (90) | 49 (58) | 0.78 |
| Outpatient | 4 (67) | 25 (86) | 6 (10) | 36 (42) | ||
| Charlson Comorbidity Index, mean (SD) | 1.7 (1.0) | 2.0 (1.5) | 0.59 | 3.1 (1.7) | 2.8 (1.6) | 0.18 |
| BMI category, n (%) | ||||||
| <30 | 0 (0) | 10 (34) | 1.03 | 23 (40) | 32 (38) | 0.04 |
| ≥30 | 6 (100) | 19 (66) | 35 (60) | 53 (62) |
Abbreviations: ASA, American Society of Anesthesiologists Physical Status Classification System; BMI, body mass index; GSACH, Geisinger Shamokin Area Community Hospital, GWV, Geisinger Wyoming Valley Medical Center; 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.
Standardized difference scores |d| of greater than 0.10 are denoted in bold.