Table 1. Logistic Regression Analysis for Patient Satisfaction.
| Variable | Satisfied (n = 784) | Dissatisfied (n = 74) | Univariate analysis | Multivariate analysis | |||
|---|---|---|---|---|---|---|---|
| OR (95% CI) | p-value | OR (95% CI) | p-value | ||||
| Age (yr) | 74.5 ± 7.0 (50 to 94) | 73.9 ± 7.3 (58 to 86) | 1.035 (0.992 to 1.080) | 0.115 | 1.019 (0.984 to 1.055) | 0.291 | |
| Sex | Male (ref) | 45 (5.7) | 3 (4.1) | ||||
| Female | 739 (94.3) | 71 (95.9) | 0.754 (0.185 to 3.066) | 0.693 | |||
| Body mass index (kg/m2) | 26.8 ± 3.4 (15.8 to 38.1) | 26.2 ± 3.5 (20.4 to 37.7) | 1.040 (0.954 1.134) | 0.376 | |||
| Preoperative HKAA | 10.4 ± 5.0 (0.1 to 30.8) | 10.4 ± 4.4 (2.5 to 21.9) | 1.009 (0.951 to 1.072) | 0.785 | |||
| Postoperative HKAA | 1.5 ± 1.7 (–5.5 to 6.5) | 1.1 ± 1.8 (–5.0 to 5.2) | 1.102 (0.944 to 1.286) | 0.219 | |||
| Kellgren-Lawrence grade | 3 (ref) | 73 (9.3) | 4 (5.4) | ||||
| 4 | 711 (90.7) | 70 (94.6) | 0.593 (0.196 to 1.797) | 0.355 | |||
| Implant malalignment | No (ref) | 745 (95.0) | 69 (93.2) | ||||
| Yes | 39 (5.0) | 5 (6.8) | 1.247 (0.38 to 4.063) | 0.715 | |||
| ASA physical status classification | 1 (ref) | 155 (19.8) | 16 (21.6) | ||||
| 2 | 599 (76.4) | 53 (71.6) | 0.816 (0.358 to 1.858) | 0.628 | |||
| 3 | 30 (3.7) | 5 (6.8) | 0.349 (0.093 to 1.303) | 0.117 | 0.671 (0.215 to 2.089) | 0.491 | |
| Preoperative WOMAC | 48.3 ± 16.3 (11 to 96) | 48.0 ± 15.3 (23 to 85) | 1.004 (0.985 to 1.023) | 0.711 | |||
| Cerebrovascular disease | No (ref) | 710 (90.5) | 58 (78.4) | ||||
| Yes | 74 (9.5) | 16 (21.6) | 0.363 (0.169 to 0.777) | 0.009* | 0.403 (0.212 to 0.765) | 0.005* | |
| Diabetes mellitus | No (ref) | 572 (73.0) | 59 (79.7) | ||||
| Yes | 212 (27.0) | 15 (20.3) | 1.648 (0.781 to 3.481) | 0.19 | 1.629 (0.881 to 3.012) | 0.12 | |
| Hypertension | No (ref) | 285 (36.4) | 27 (36.5) | ||||
| Yes | 499 (63.6) | 47 (63.5) | 0.722 (0.355 to 1.467) | 0.367 | |||
| Ischemic heart disease | No (ref) | 705 (89.9) | 68 (91.9) | ||||
| Yes | 79 (10.1) | 6 (8.1) | 1.089 (0.391 to 3.035) | 0.870 | |||
| Chronic liver disease | No (ref) | 754 (96.2) | 70 (94.6) | ||||
| Yes | 30 (3.8) | 4 (5.4) | 0.291 (0.067 to 1.264) | 0.099 | 0.441 (0.139 to 1.398) | 0.164 | |
| Chronic kidney disease | No (ref) | 759 (96.8) | 71 (95.9) | ||||
| Yes | 25 (3.2) | 3 (4.1) | 0.391 (0.088 to 1.726) | 0.215 | |||
| Psychological disease | No (ref) | 755 (96.3) | 70 (94.6) | ||||
| Yes | 29 (3.7) | 4 (5.4) | 0.550 (0.147 to 2.052) | 0.374 | |||
| Patella resurfacing | No (ref) | 275 (35.1) | 41 (55.4) | ||||
| Yes | 509 (64.9) | 33 (44.6) | 1.238 (0.627 to 2.443) | 0.538 | |||
| Implant bearing | Mobile (ref) | 268 (34.2) | 42 (56.8) | ||||
| Mobile/fixed | Fixed (ref) | 516 (65.8) | 32 (43.2) | 2.227 (1.110 to 4.467) | 0.024* | 2.366 (1.398 to 4.004) | 0.001* |
| Postop flexion contracture | 0.4 ± 2.2 (–5 to 20) | 0.5 ± 2.6 (–5 to 10) | 1.019 (0.896 to 1.158) | 0.779 | |||
| Postop flexion angle | 128.0 ± 10.2 (80 to 150) | 122.2 ± 13.1 (70 to 145) | 1.061 (1.033 to 1.089) | < 0.001* | 1.045 (1.023 to 1.068) | < 0.001* | |
| Change in flexion contracture | –8.7 ± 7.1 (–30 to 20)† | –7.8 ± 7.2 (–30 to 10)† | 0.965 (0.922 to 1.011) | 0.130 | 0.964 (0.929 to 1.000) | 0.052 | |
| Change in flexion angle | 2.7 ± 13.8 (–45 to 60) | –0.1 ± 14.7 (–30 to 45)† | 0.984 (0.963 to 1.006) | 0.148 | 0.995 (0.977 to 1.013) | 0.581 | |
Values are presented as mean ± standard deviation (range) or number (%).
OR: odds ratio, CI: confidence interval, ref: reference value, HKAA: hip-knee-ankle angle, preop: preoperative, postop: postoperative, ASA: American Society of Anesthesiologists, WOMAC: Western Ontario and McMaster Universities Osteoarthritis index.
*Statistically significant at p < 0.05. †Negative values indicate a decrease.