Table 4 Comparison of the positive rate of X-ray and MRI in the experimental group at the 4th week
|  |  | X-ray | 7.0 T MRI | P value |
|---|---|---|---|---|
Group B (n = 6) | Number of positive | 2 | 5 | 0.135 |
Number of negative | 4 | 1 | ||
Group C (n = 7) | Number of positive | 1 | 5 | 0.032 |
Number of negative | 6 | 2 | ||
Group D (n = 5) | Number of positive | 3 | 5 | 0.256 |
Number of negative | 2 | 0 | ||
Total (n = 18) | Number of positive | 6 | 15 | 0.001 |
Number of negative | 12 | 3 |