Table 3.
Change in meniscal appearance on follow-up MRI compared with initial MRI
| Lateral meniscus anterior horn | Lateral meniscus posterior horn | Medial meniscus anterior horn | Medial meniscus posterior horn | Total | |
|---|---|---|---|---|---|
| (n = 101) | (n = 101) | (n = 101) | (n = 100) | (n = 403) | |
| Unchanged | |||||
| Normal to normal | 56 | 71 | 85 | 19 | 231 |
| Grade 1 to grade 1 | 12 | 9 | 5 | 24 | 50 |
| Grade 2 to grade 2 | 1 | 0 | 3 | 16 | 20 |
| Horizontal tear to horizontal tear | 5 | 6 | 2 | 10 | 23 |
| Vertical tear to vertical tear | 3 | 0 | 1 | 7 | 11 |
| Complex tear to complex tear | 1 | 0 | 0 | 0 | 1 |
| New degenerative lesions and tears | |||||
| Normal to grade 1 (new) | 11 | 7 | 2 | 5 | 25 |
| Normal to grade 2 (new) | 2 | 0 | 0 | 0 | 2 |
| Normal to horizontal tear | 2 | 0 | 0 | 1 | 3 |
| Progression of lesion complexity | |||||
| Grade 1 to grade 2 | 0 | 1 | 0 | 4 | 5 |
| Grade 1 to horizontal tear | 1 | 0 | 0 | 0 | 1 |
| Grade 2 to horizontal tear | 1 | 0 | 0 | 4 | 5 |
| Horizontal tear to complex tear | 0 | 3 | 0 | 2 | 5 |
| Vertical tear to complex tear | 3 | 0 | 0 | 0 | 3 |
| Improvement of lesion complexity | |||||
| Grade 2 to grade 1 | 0 | 1 | 1 | 1 | 3 |
| Horizontal tear to grade 2 | 1 | 0 | 0 | 1 | 2 |
| Vertical tear to grade 1 | 0 | 0 | 0 | 1 | 1 |
| Vertical tear to grade 2 | 0 | 0 | 0 | 2 | 2 |
| Complex tear to horizontal tear | 0 | 0 | 0 | 1 | 1 |
| Normalisation of lesions | |||||
| Grade 1 to normal | 2 | 2 | 1 | 1 | 6 |
| Grade 2 to normal | 0 | 0 | 1 | 1 | 2 |
| Horizontal tear to normal | 0 | 1 | 0 | 0 | 1 |
Combinations that are not listed in the table were not observed in our study