Table 1.
Demographic characteristics of the two groups.
| PSI group (n = 16) |
CO group (n = 23) |
P value | |
|---|---|---|---|
| Age and years | 60.81 ± 4.02 | 56.21 ± 9.4 | 0.074 |
| Sex (male : female) | 6 : 10 | 10 : 13 | 0.752 |
| Side (right : left) | 10 : 6 | 7 : 16 | 0.059 |
| BMI (kg/m2) | 24.72 ± 2.97 | 24.49 ± 3.21 | 0.823 |
| Kellgren–Lawrence grade (I:II:III) | 1 : 4 : 11 | 5 : 3 : 15 | — |
| WBL (weight-bearing line) ratio (%) | 25.33 ± 5.66 | 24.49 ± 3.21 | 0.598 |
| HKA (hip-knee-ankle angle) (°) | 173.00 ± 1.95 | 173.83 ± 2.87 | 0.321 |
| MPTA (medial proximal tibial angle) (°) | 83.07 ± 1.52 | 83.50 ± 1.96 | 0.468 |
| PTSA (posterior tibial slope angle) (°) | 11.31 ± 1.91 | 10.04 ± 2.09 | 0.062 |
| Insall–Salvati index | 0.95 ± 0.11 | 1.01 ± 0.13 | 0.109 |
(PSI: patient-specific instrumentation. CO: conventional operation. BMI: body mass index).