Table 2.
Comparison of radiographic parameters at the time of second-look operation
| Variable | Group 1 (n = 59) |
Group 2 (n = 33) |
P value |
|---|---|---|---|
| Load-bearing axis deviation a (%) | 64.3 ± 9.2 | 64.2 ± 6.4 | 0.983 |
| Hip-Knee-Ankle angle a (valgus, °) | 4.3 ± 2.6 | 4.0 ± 1.7 | 0.542 |
| Medial proximal tibial angle a (°) | 93.7 ± 3.0 | 93.5 ± 2.4 | 0.807 |
| Joint line convergence angle a (°) | 1.8 ± 2.2 | 1.7 ± 2.0 | 0.846 |
| Posterior tibial slope (°) | 6.8 ± 4.6 | 7.7 ± 4.0 | 0.346 |
| Blackburne-Peel ratio a | 0.7 ± 0.1 | 0.8 ± 0.2 | 0.146 |
| Caton-Deschamps ratio a | 0.8 ± 0.2 | 0.9 ± 0.2 | 0.107 |
| Lateral patellofemoral angle a (°) | 13.5 ± 4.2 | 12.3 ± 5.6 | 0.258 |
| Kellgren–Lawrence gradeb | 0.441 | ||
| Grade 1 | 0 (0.0%) | 1 (3.0%) | |
| Grade 2 | 8 (13.6%) | 7 (21.2%) | |
| Grade 3 | 43 (72.9%) | 21 (63.6%) | |
| Grade 4 | 8 (13.6%) | 4 (12.1%) | |
| Patellofemoral osteoarthritis stage according to Iwano’s classificationb | 0.124 | ||
| Stage 0 | 8 (13.6%) | 10 (30.3%) | |
| Stage 1 | 25 (42.4%) | 13 (39.4%) | |
| Stage 2 | 26 (44.1%) | 10 (30.3%) |
a The values are given as the mean and standard deviation
b The values are given as the number of patients, with the percentage in parenthesis