Table 3.
Assessment of radiographic osteoarthritis grade of patellofemoral joint according to Iwano’s classification system at second-look operation compared with the initial operation
| Group 1 (n = 59) |
Group 2 (n = 33) |
P value b | |
|---|---|---|---|
| Preoperative a | 0.096 | ||
| Stage 0 | 10 (16.9%) | 12 (36.4%) | |
| Stage 1 | 27 (45.8%) | 13 (39.4%) | |
| Stage 2 | 22 (37.3%) | 8 (24.2%) | |
| Postoperative (Second-Look) a | 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%) | |
| P value c | 0.109 | 0.157 |
a The values are given as the number of patients, with the percentage in parenthesis
b Statistical significance was evaluated using Pearson’s Chi-squared or Fisher’s exact test
c Statistical significance was evaluated compared with the preoperative measurement values using Wilcoxon signed rank test