British Athletics Muscle Injury Classification (MRI)
| Grade 1 | Grade 2 | Grade 3 | Grade 4 |
|---|---|---|---|
| < 10% CSA | 10 - 50% CSA | > 50% | Complete tears |
| < 5 cm length | 5 - 15 cm in length | > 15 cm long |
A: Myofascial / peripheral aspect of muscle - best prognosis
B: Musculo-tendinous - most common
C: Intra-tendinous - worst prognosis
Grade 2C:
- < 5 cm and < 50% of tendon involvement
Grade 3C:
- > 5cm and > 50% tendon involvement
- loss of straight margins / tendon tension suggesting some loss of tendon integrity
MRI
Grade 2b lateral soleus