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Contingency table of the observation frequency: Agreement between magnetic resonance imaging (MRI) and arthroscopy (severe cartilage changes).
| Arthroscopy (Cartilage changes) | Total | |||
|---|---|---|---|---|
| Changes | Positive | Negative | ||
| MRI | Positive | 9 | 9 | 18 |
| (Bone changes) | Negative | 2 | 12 | 14 |
| Total | 11 | 21 | 32 | |
